diff --git a/default.nix b/default.nix
index ec800b1..b70c952 100644
--- a/default.nix
+++ b/default.nix
@@ -52,6 +52,7 @@ rec {
   wii-u-gc-adapter = pkgs.callPackage ./pkgs/wii-u-gc-adapter { };
 
   # minecraft-server-fabric = pkgs.callPackage ./pkgs/minecraft-server-fabric { };
+  mcaselector = pkgs.callPackage ./pkgs/mcaselector { };
 
   dowlords-faf-client = pkgs.callPackage ./pkgs/downlords { jdk16 = pkgs.jdk; };
 
diff --git a/pkgs/mcaselector/0001-java-version.patch b/pkgs/mcaselector/0001-java-version.patch
new file mode 100644
index 0000000..828009c
--- /dev/null
+++ b/pkgs/mcaselector/0001-java-version.patch
@@ -0,0 +1,20 @@
+diff --git a/build.gradle b/build.gradle
+index 52e08db..f9d3d9d 100644
+--- a/build.gradle
++++ b/build.gradle
+@@ -14,7 +14,7 @@ def appName = 'MCA Selector'
+ def appUrl = 'https://github.com/Querz/mcaselector'
+ def appAuthor = 'Querz'
+ 
+-sourceCompatibility = 16
++sourceCompatibility = 17
+ 
+ idea {
+ 	module.downloadSources = true
+@@ -289,4 +289,4 @@ static String appendLicense(File f, String l) {
+ 				content
+ 	}
+ 	return l
+-}
+\ No newline at end of file
++}
diff --git a/pkgs/mcaselector/default.nix b/pkgs/mcaselector/default.nix
new file mode 100644
index 0000000..6bf20e8
--- /dev/null
+++ b/pkgs/mcaselector/default.nix
@@ -0,0 +1,37 @@
+{lib, stdenv, fetchurl, jre, gsettings-desktop-schemas, wrapGAppsHook, glib }:
+
+stdenv.mkDerivation rec {
+  pname = "mcaselector";
+  version = "1.17.1";
+
+  src = fetchurl {
+    url = "https://github.com/Querz/mcaselector/releases/download/${version}/mcaselector-${version}.jar";
+    sha256 = "0nrr21hj05ng1w02aygkh8a2s85gypxyjmc1bikp3farlgcjc5l3";
+  };
+
+  dontUnpack = true;
+
+  nativeBuildInputs = [ wrapGAppsHook glib ];
+#  buildInputs = [ gsettings-desktop-schemas ];
+
+  dontWrapGApps = true;  
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/share/java $out/bin
+    cp $src $out/share/java/mcaselector-${version}.jar
+
+    echo "''${gappsWrapperArgs[@]}"
+
+    makeWrapper ${jre}/bin/java $out/bin/mcaselector \
+      --add-flags "-jar $out/share/java/mcaselector-${version}.jar" \
+      --set _JAVA_OPTIONS '-Dawt.useSystemAAFontSettings=on' \
+      --set _JAVA_AWT_WM_NONREPARENTING 1 \
+      --prefix XDG_DATA_DIRS : "$GSETTINGS_SCHEMAS_PATH" \
+      "''${gappsWrapperArgs[@]}"
+
+    runHook postInstall
+  '';
+
+}
diff --git a/pkgs/mcaselector/gradle-env.json b/pkgs/mcaselector/gradle-env.json
new file mode 100644
index 0000000..960b49c
--- /dev/null
+++ b/pkgs/mcaselector/gradle-env.json
@@ -0,0 +1,952 @@
+{
+  "": {
+    "name": "mcaselector",
+    "version": "1.17",
+    "path": "",
+    "gradle": {
+      "version": "7.0.2",
+      "type": "bin",
+      "url": "https://services.gradle.org/distributions/gradle-7.0.2-bin.zip",
+      "sha256": "0e46229820205440b48a5501122002842b82886e76af35f0f3a069243dca4b3c",
+      "nativeVersion": "0.22-milestone-16"
+    },
+    "dependencies": {
+      "settings": [],
+      "plugin": [
+        {
+          "id": {
+            "group": "com.github.johnrengelman.shadow",
+            "name": "com.github.johnrengelman.shadow.gradle.plugin",
+            "version": "7.0.0",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "com.github.johnrengelman.shadow.gradle.plugin-7.0.0.pom",
+          "path": "com/github/johnrengelman/shadow/com.github.johnrengelman.shadow.gradle.plugin/7.0.0",
+          "urls": [
+            "https://plugins.gradle.org/m2/com/github/johnrengelman/shadow/com.github.johnrengelman.shadow.gradle.plugin/7.0.0/com.github.johnrengelman.shadow.gradle.plugin-7.0.0.pom"
+          ],
+          "sha256": "424b7d1343be0e521eec422c1e16b6be6b28042512673e4aa8499c5038e1a509"
+        },
+        {
+          "id": {
+            "group": "com.gradle.publish",
+            "name": "plugin-publish-plugin",
+            "version": "0.14.0",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "plugin-publish-plugin-0.14.0.jar",
+          "path": "com/gradle/publish/plugin-publish-plugin/0.14.0",
+          "urls": [
+            "https://plugins.gradle.org/m2/com/gradle/publish/plugin-publish-plugin/0.14.0/plugin-publish-plugin-0.14.0.jar"
+          ],
+          "sha256": "e5f60ab215d43f2614872bac5fdf9aaae3fd734bd67e93bf11a40007ec78d3f2"
+        },
+        {
+          "id": {
+            "group": "com.gradle.publish",
+            "name": "plugin-publish-plugin",
+            "version": "0.14.0",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "plugin-publish-plugin-0.14.0.pom",
+          "path": "com/gradle/publish/plugin-publish-plugin/0.14.0",
+          "urls": [
+            "https://plugins.gradle.org/m2/com/gradle/publish/plugin-publish-plugin/0.14.0/plugin-publish-plugin-0.14.0.pom"
+          ],
+          "sha256": "1075de06063cf6f37c20f42ff03a056bada82f4c87b03de16e40059b25d9001b"
+        },
+        {
+          "id": {
+            "group": "commons-io",
+            "name": "commons-io",
+            "version": "2.8.0",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "commons-io-2.8.0.jar",
+          "path": "commons-io/commons-io/2.8.0",
+          "urls": [
+            "https://plugins.gradle.org/m2/commons-io/commons-io/2.8.0/commons-io-2.8.0.jar"
+          ],
+          "sha256": "02f291e5d1243dc143496e3cbbb40a1ced47aa58f2d633d3e38780cd068d5074"
+        },
+        {
+          "id": {
+            "group": "commons-io",
+            "name": "commons-io",
+            "version": "2.8.0",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "commons-io-2.8.0.pom",
+          "path": "commons-io/commons-io/2.8.0",
+          "urls": [
+            "https://plugins.gradle.org/m2/commons-io/commons-io/2.8.0/commons-io-2.8.0.pom"
+          ],
+          "sha256": "d7c8641a37d6e76f36fb9e81fc1420e26a09d63fa32f00f74764de067ca8347d"
+        },
+        {
+          "id": {
+            "group": "gradle.plugin.com.github.jengelman.gradle.plugins",
+            "name": "shadow",
+            "version": "7.0.0",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "shadow-7.0.0.jar",
+          "path": "gradle/plugin/com/github/jengelman/gradle/plugins/shadow/7.0.0",
+          "urls": [
+            "https://plugins.gradle.org/m2/gradle/plugin/com/github/jengelman/gradle/plugins/shadow/7.0.0/shadow-7.0.0.jar"
+          ],
+          "sha256": "8e7b12a0a2c2d170884a860679a019bab60b63bc99ebfa0db0897d249d86f345"
+        },
+        {
+          "id": {
+            "group": "gradle.plugin.com.github.jengelman.gradle.plugins",
+            "name": "shadow",
+            "version": "7.0.0",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "shadow-7.0.0.pom",
+          "path": "gradle/plugin/com/github/jengelman/gradle/plugins/shadow/7.0.0",
+          "urls": [
+            "https://plugins.gradle.org/m2/gradle/plugin/com/github/jengelman/gradle/plugins/shadow/7.0.0/shadow-7.0.0.pom"
+          ],
+          "sha256": "6812f26f6d81eccced5411603475cb3a92594fa48077c75eb08d05165ebbf475"
+        },
+        {
+          "id": {
+            "group": "org.apache",
+            "name": "apache",
+            "version": "10",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "apache-10.pom",
+          "path": "org/apache/apache/10",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/apache/10/apache-10.pom"
+          ],
+          "sha256": "802feece72852dafcbd0a425a60367c72c5cb9b6ea5aae59481128569189daf9"
+        },
+        {
+          "id": {
+            "group": "org.apache",
+            "name": "apache",
+            "version": "23",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "apache-23.pom",
+          "path": "org/apache/apache/23",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/apache/23/apache-23.pom"
+          ],
+          "sha256": "bc10624e0623f36577fac5639ca2936d3240ed152fb6d8d533ab4d270543491c"
+        },
+        {
+          "id": {
+            "group": "org.apache.ant",
+            "name": "ant",
+            "version": "1.10.9",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "ant-1.10.9.jar",
+          "path": "org/apache/ant/ant/1.10.9",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/ant/ant/1.10.9/ant-1.10.9.jar"
+          ],
+          "sha256": "0715478af585ea80a18985613ebecdc7922122d45b2c3c970ff9b352cddb75fc"
+        },
+        {
+          "id": {
+            "group": "org.apache.ant",
+            "name": "ant",
+            "version": "1.10.9",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "ant-1.10.9.pom",
+          "path": "org/apache/ant/ant/1.10.9",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/ant/ant/1.10.9/ant-1.10.9.pom"
+          ],
+          "sha256": "b6276017cf6f2a07b7b7b62778333237ca73405fcc3af1ca9d95f52f97fb79e1"
+        },
+        {
+          "id": {
+            "group": "org.apache.ant",
+            "name": "ant-launcher",
+            "version": "1.10.9",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "ant-launcher-1.10.9.jar",
+          "path": "org/apache/ant/ant-launcher/1.10.9",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/ant/ant-launcher/1.10.9/ant-launcher-1.10.9.jar"
+          ],
+          "sha256": "fcce891f57f3be72149ff96ac2a80574165b3e0839866b95d24528f3027d50c1"
+        },
+        {
+          "id": {
+            "group": "org.apache.ant",
+            "name": "ant-launcher",
+            "version": "1.10.9",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "ant-launcher-1.10.9.pom",
+          "path": "org/apache/ant/ant-launcher/1.10.9",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/ant/ant-launcher/1.10.9/ant-launcher-1.10.9.pom"
+          ],
+          "sha256": "124de56fea61db6c0db49c079d1eb65d4896c1ac4d11ff26557be369e3dbea5b"
+        },
+        {
+          "id": {
+            "group": "org.apache.ant",
+            "name": "ant-parent",
+            "version": "1.10.9",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "ant-parent-1.10.9.pom",
+          "path": "org/apache/ant/ant-parent/1.10.9",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/ant/ant-parent/1.10.9/ant-parent-1.10.9.pom"
+          ],
+          "sha256": "cad4640e094434e97041ae11172d10980ec04299844560bf67e4637be8450b96"
+        },
+        {
+          "id": {
+            "group": "org.apache.commons",
+            "name": "commons-parent",
+            "version": "52",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "commons-parent-52.pom",
+          "path": "org/apache/commons/commons-parent/52",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/commons/commons-parent/52/commons-parent-52.pom"
+          ],
+          "sha256": "75dbe8f34e98e4c3ff42daae4a2f9eb4cbcd3b5f1047d54460ace906dbb4502e"
+        },
+        {
+          "id": {
+            "group": "org.apache.logging",
+            "name": "logging-parent",
+            "version": "3",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "logging-parent-3.pom",
+          "path": "org/apache/logging/logging-parent/3",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/logging/logging-parent/3/logging-parent-3.pom"
+          ],
+          "sha256": "763a2ec2b8094d4161deb6c264b1262085b9be30bf3a31c2ce137242e57722a7"
+        },
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+            "name": "log4j",
+            "version": "2.14.1",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "log4j-2.14.1.pom",
+          "path": "org/apache/logging/log4j/log4j/2.14.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/logging/log4j/log4j/2.14.1/log4j-2.14.1.pom"
+          ],
+          "sha256": "972d7e467fd0f36f05e8ff72730d363cb04d56add01681d19e243f5341eff0b2"
+        },
+        {
+          "id": {
+            "group": "org.apache.logging.log4j",
+            "name": "log4j-api",
+            "version": "2.14.1",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "log4j-api-2.14.1.jar",
+          "path": "org/apache/logging/log4j/log4j-api/2.14.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/logging/log4j/log4j-api/2.14.1/log4j-api-2.14.1.jar"
+          ],
+          "sha256": "8caf58db006c609949a0068110395a33067a2bad707c3da35e959c0473f9a916"
+        },
+        {
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+            "name": "log4j-api",
+            "version": "2.14.1",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "log4j-api-2.14.1.pom",
+          "path": "org/apache/logging/log4j/log4j-api/2.14.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/logging/log4j/log4j-api/2.14.1/log4j-api-2.14.1.pom"
+          ],
+          "sha256": "909fa83ac088e70c8ba0dfb0fbd5b3027d03262edaafcca1250cc6aec46f0ad4"
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+            "name": "log4j-core",
+            "version": "2.14.1",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "log4j-core-2.14.1.jar",
+          "path": "org/apache/logging/log4j/log4j-core/2.14.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/logging/log4j/log4j-core/2.14.1/log4j-core-2.14.1.jar"
+          ],
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+            "version": "2.14.1",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "log4j-core-2.14.1.pom",
+          "path": "org/apache/logging/log4j/log4j-core/2.14.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/logging/log4j/log4j-core/2.14.1/log4j-core-2.14.1.pom"
+          ],
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+            "version": "3.0.4",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "maven-3.0.4.pom",
+          "path": "org/apache/maven/maven/3.0.4",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/maven/maven/3.0.4/maven-3.0.4.pom"
+          ],
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+            "version": "3.0.4",
+            "type": "jar",
+            "extension": "jar"
+          },
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+          "path": "org/apache/maven/maven-model/3.0.4",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/maven/maven-model/3.0.4/maven-model-3.0.4.jar"
+          ],
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+          },
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+          "path": "org/apache/maven/maven-model/3.0.4",
+          "urls": [
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+            "version": "21",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "maven-parent-21.pom",
+          "path": "org/apache/maven/maven-parent/21",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/apache/maven/maven-parent/21/maven-parent-21.pom"
+          ],
+          "sha256": "fc45af8911ea307d1b57564eef1f78b69801e9c11a5619e7eb58d5d00ae9db8e"
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+            "extension": "pom"
+          },
+          "name": "plexus-5.1.pom",
+          "path": "org/codehaus/plexus/plexus/5.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/codehaus/plexus/plexus/5.1/plexus-5.1.pom"
+          ],
+          "sha256": "a343e44ff5796aed0ea60be11454c935ce20ab1c5f164acc8da574482dcbc7e9"
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+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "plexus-utils-3.3.0.jar",
+          "path": "org/codehaus/plexus/plexus-utils/3.3.0",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/codehaus/plexus/plexus-utils/3.3.0/plexus-utils-3.3.0.jar"
+          ],
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+          },
+          "name": "plexus-utils-3.3.0.pom",
+          "path": "org/codehaus/plexus/plexus-utils/3.3.0",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/codehaus/plexus/plexus-utils/3.3.0/plexus-utils-3.3.0.pom"
+          ],
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+            "version": "2.0.6",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "jdom2-2.0.6.jar",
+          "path": "org/jdom/jdom2/2.0.6",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/jdom/jdom2/2.0.6/jdom2-2.0.6.jar"
+          ],
+          "sha256": "1345f11ba606d15603d6740551a8c21947c0215640770ec67271fe78bea97cf5"
+        },
+        {
+          "id": {
+            "group": "org.jdom",
+            "name": "jdom2",
+            "version": "2.0.6",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "jdom2-2.0.6.pom",
+          "path": "org/jdom/jdom2/2.0.6",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/jdom/jdom2/2.0.6/jdom2-2.0.6.pom"
+          ],
+          "sha256": "47b23a79fe336b741b82434c6e049d68165256e405e75c10921fd72fa8a65d8d"
+        },
+        {
+          "id": {
+            "group": "org.ow2",
+            "name": "ow2",
+            "version": "1.5",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "ow2-1.5.pom",
+          "path": "org/ow2/ow2/1.5",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/ow2/ow2/1.5/ow2-1.5.pom"
+          ],
+          "sha256": "0f8a1b116e760b8fe6389c51b84e4b07a70fc11082d4f936e453b583dd50b43b"
+        },
+        {
+          "id": {
+            "group": "org.ow2.asm",
+            "name": "asm",
+            "version": "9.1",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "asm-9.1.jar",
+          "path": "org/ow2/asm/asm/9.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/ow2/asm/asm/9.1/asm-9.1.jar"
+          ],
+          "sha256": "cda4de455fab48ff0bcb7c48b4639447d4de859a7afc30a094a986f0936beba2"
+        },
+        {
+          "id": {
+            "group": "org.ow2.asm",
+            "name": "asm",
+            "version": "9.1",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "asm-9.1.pom",
+          "path": "org/ow2/asm/asm/9.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/ow2/asm/asm/9.1/asm-9.1.pom"
+          ],
+          "sha256": "c683a90dd68f2b1788cbdfc4647ea9405ef5925b371c199f8fd39d44d3cede8d"
+        },
+        {
+          "id": {
+            "group": "org.ow2.asm",
+            "name": "asm-analysis",
+            "version": "9.1",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "asm-analysis-9.1.jar",
+          "path": "org/ow2/asm/asm-analysis/9.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/ow2/asm/asm-analysis/9.1/asm-analysis-9.1.jar"
+          ],
+          "sha256": "81a88041b1b8beda5a8a99646098046c48709538270c49def68abff25ac3be34"
+        },
+        {
+          "id": {
+            "group": "org.ow2.asm",
+            "name": "asm-analysis",
+            "version": "9.1",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "asm-analysis-9.1.pom",
+          "path": "org/ow2/asm/asm-analysis/9.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/ow2/asm/asm-analysis/9.1/asm-analysis-9.1.pom"
+          ],
+          "sha256": "ac5454c11b03431ca951df71fb4e86c8c4c80df6979f95b757caed3ab0f47156"
+        },
+        {
+          "id": {
+            "group": "org.ow2.asm",
+            "name": "asm-commons",
+            "version": "9.1",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "asm-commons-9.1.jar",
+          "path": "org/ow2/asm/asm-commons/9.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/ow2/asm/asm-commons/9.1/asm-commons-9.1.jar"
+          ],
+          "sha256": "afcb26dc1fc12c0c4a99ada670908dd82e18dfc488caf5ee92546996b470c00c"
+        },
+        {
+          "id": {
+            "group": "org.ow2.asm",
+            "name": "asm-commons",
+            "version": "9.1",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "asm-commons-9.1.pom",
+          "path": "org/ow2/asm/asm-commons/9.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/ow2/asm/asm-commons/9.1/asm-commons-9.1.pom"
+          ],
+          "sha256": "a0f651b27b8afe9c0e612d7a0266eacb5f7b1c787bc4b5ac8245f3d7a1181b7f"
+        },
+        {
+          "id": {
+            "group": "org.ow2.asm",
+            "name": "asm-tree",
+            "version": "9.1",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "asm-tree-9.1.jar",
+          "path": "org/ow2/asm/asm-tree/9.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/ow2/asm/asm-tree/9.1/asm-tree-9.1.jar"
+          ],
+          "sha256": "fd00afa49e9595d7646205b09cecb4a776a8ff0ba06f2d59b8f7bf9c704b4a73"
+        },
+        {
+          "id": {
+            "group": "org.ow2.asm",
+            "name": "asm-tree",
+            "version": "9.1",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "asm-tree-9.1.pom",
+          "path": "org/ow2/asm/asm-tree/9.1",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/ow2/asm/asm-tree/9.1/asm-tree-9.1.pom"
+          ],
+          "sha256": "b6a00d9207c035460f81c7d70ed41253f0d216652bed45fa1a3052ffcd50b94c"
+        },
+        {
+          "id": {
+            "group": "org.vafer",
+            "name": "jdependency",
+            "version": "2.6.0",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "jdependency-2.6.0.jar",
+          "path": "org/vafer/jdependency/2.6.0",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/vafer/jdependency/2.6.0/jdependency-2.6.0.jar"
+          ],
+          "sha256": "bed1860da230a1132ba52897c085de88f51e17ec7a20d2597e85661b2e7a9c11"
+        },
+        {
+          "id": {
+            "group": "org.vafer",
+            "name": "jdependency",
+            "version": "2.6.0",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "jdependency-2.6.0.pom",
+          "path": "org/vafer/jdependency/2.6.0",
+          "urls": [
+            "https://plugins.gradle.org/m2/org/vafer/jdependency/2.6.0/jdependency-2.6.0.pom"
+          ],
+          "sha256": "5d00a81a6cadf8e60394bc1829fea023849261196f76ed4099dfeca3d5d92180"
+        }
+      ],
+      "buildscript": [],
+      "project": [
+        {
+          "id": {
+            "group": "ar.com.hjg",
+            "name": "pngj",
+            "version": "2.1.0",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "pngj-2.1.0.jar",
+          "path": "ar/com/hjg/pngj/2.1.0",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/ar/com/hjg/pngj/2.1.0/pngj-2.1.0.jar"
+          ],
+          "sha256": "e6b762f15e4891178dddd74e4d57318f518ce278000129efa41f85410b132ccc"
+        },
+        {
+          "id": {
+            "group": "ar.com.hjg",
+            "name": "pngj",
+            "version": "2.1.0",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "pngj-2.1.0.pom",
+          "path": "ar/com/hjg/pngj/2.1.0",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/ar/com/hjg/pngj/2.1.0/pngj-2.1.0.pom"
+          ],
+          "sha256": "80717d62484256843ba1221b6f2ef867acd1c515a08311dad487b7272685bb45"
+        },
+        {
+          "id": {
+            "group": "com.github.Querz",
+            "name": "NBT",
+            "version": "4192a95c9d",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "NBT-4192a95c9d.jar",
+          "path": "com/github/Querz/NBT/4192a95c9d",
+          "urls": [
+            "https://jitpack.io/com/github/Querz/NBT/4192a95c9d/NBT-4192a95c9d.jar"
+          ],
+          "sha256": "2d0550a2bcbb320c330e3101a46491c24bcdc9262dd45a8a1db5acc01fe19b04"
+        },
+        {
+          "id": {
+            "group": "com.github.Querz",
+            "name": "NBT",
+            "version": "4192a95c9d",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "NBT-4192a95c9d.pom",
+          "path": "com/github/Querz/NBT/4192a95c9d",
+          "urls": [
+            "https://jitpack.io/com/github/Querz/NBT/4192a95c9d/NBT-4192a95c9d.pom"
+          ],
+          "sha256": "5c72516ef1fc501a48c725e5e6da84a5a26b77e087d46f62f69dc34b3576e09c"
+        },
+        {
+          "id": {
+            "group": "commons-io",
+            "name": "commons-io",
+            "version": "2.6",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "commons-io-2.6.jar",
+          "path": "commons-io/commons-io/2.6",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/commons-io/commons-io/2.6/commons-io-2.6.jar"
+          ],
+          "sha256": "f877d304660ac2a142f3865badfc971dec7ed73c747c7f8d5d2f5139ca736513"
+        },
+        {
+          "id": {
+            "group": "commons-io",
+            "name": "commons-io",
+            "version": "2.6",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "commons-io-2.6.pom",
+          "path": "commons-io/commons-io/2.6",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/commons-io/commons-io/2.6/commons-io-2.6.pom"
+          ],
+          "sha256": "0c23863893a2291f5a7afdbd8d15923b3948afd87e563fa341cdcf6eae338a60"
+        },
+        {
+          "id": {
+            "group": "it.unimi.dsi",
+            "name": "fastutil",
+            "version": "8.5.6",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "fastutil-8.5.6.jar",
+          "path": "it/unimi/dsi/fastutil/8.5.6",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/it/unimi/dsi/fastutil/8.5.6/fastutil-8.5.6.jar"
+          ],
+          "sha256": "5021369bdc72e2ca24222d036c9b35c9733dc9c082a0891c4dba5a583663f30b"
+        },
+        {
+          "id": {
+            "group": "it.unimi.dsi",
+            "name": "fastutil",
+            "version": "8.5.6",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "fastutil-8.5.6.pom",
+          "path": "it/unimi/dsi/fastutil/8.5.6",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/it/unimi/dsi/fastutil/8.5.6/fastutil-8.5.6.pom"
+          ],
+          "sha256": "5632476925b0c55ffd54f9984ca71dfb6ff9ec77e5b2096496de53f1059a37d7"
+        },
+        {
+          "id": {
+            "group": "junit",
+            "name": "junit",
+            "version": "4.12",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "junit-4.12.jar",
+          "path": "junit/junit/4.12",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/junit/junit/4.12/junit-4.12.jar"
+          ],
+          "sha256": "59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a"
+        },
+        {
+          "id": {
+            "group": "junit",
+            "name": "junit",
+            "version": "4.12",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "junit-4.12.pom",
+          "path": "junit/junit/4.12",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/junit/junit/4.12/junit-4.12.pom"
+          ],
+          "sha256": "90f163f78e3ffb6f1c7ad97de9e7eba4eea25807141b85d6d12be67ca25449c4"
+        },
+        {
+          "id": {
+            "group": "org.apache",
+            "name": "apache",
+            "version": "18",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "apache-18.pom",
+          "path": "org/apache/apache/18",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/org/apache/apache/18/apache-18.pom"
+          ],
+          "sha256": "7831307285fd475bbc36b20ae38e7882f11c3153b1d5930f852d44eda8f33c17"
+        },
+        {
+          "id": {
+            "group": "org.apache.commons",
+            "name": "commons-parent",
+            "version": "42",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "commons-parent-42.pom",
+          "path": "org/apache/commons/commons-parent/42",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/org/apache/commons/commons-parent/42/commons-parent-42.pom"
+          ],
+          "sha256": "cd313494c670b483ec256972af1698b330e598f807002354eb765479f604b09c"
+        },
+        {
+          "id": {
+            "group": "org.hamcrest",
+            "name": "hamcrest-core",
+            "version": "1.3",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "hamcrest-core-1.3.jar",
+          "path": "org/hamcrest/hamcrest-core/1.3",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar"
+          ],
+          "sha256": "66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9"
+        },
+        {
+          "id": {
+            "group": "org.hamcrest",
+            "name": "hamcrest-core",
+            "version": "1.3",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "hamcrest-core-1.3.pom",
+          "path": "org/hamcrest/hamcrest-core/1.3",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.pom"
+          ],
+          "sha256": "fde386a7905173a1b103de6ab820727584b50d0e32282e2797787c20a64ffa93"
+        },
+        {
+          "id": {
+            "group": "org.hamcrest",
+            "name": "hamcrest-parent",
+            "version": "1.3",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "hamcrest-parent-1.3.pom",
+          "path": "org/hamcrest/hamcrest-parent/1.3",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/org/hamcrest/hamcrest-parent/1.3/hamcrest-parent-1.3.pom"
+          ],
+          "sha256": "6d535f94efb663bdb682c9f27a50335394688009642ba7a9677504bc1be4129b"
+        },
+        {
+          "id": {
+            "group": "org.json",
+            "name": "json",
+            "version": "20201115",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "json-20201115.jar",
+          "path": "org/json/json/20201115",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/org/json/json/20201115/json-20201115.jar"
+          ],
+          "sha256": "bd2322a4ddf46e2612104f091aa14d4406393ef3a46f270f69c2abb5ce1d147c"
+        },
+        {
+          "id": {
+            "group": "org.json",
+            "name": "json",
+            "version": "20201115",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "json-20201115.pom",
+          "path": "org/json/json/20201115",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/org/json/json/20201115/json-20201115.pom"
+          ],
+          "sha256": "eb6d15aaba8fe4acdc4be8fe823c2f536a0c085cae42196a37e1d065bb00174d"
+        },
+        {
+          "id": {
+            "group": "org.sonatype.oss",
+            "name": "oss-parent",
+            "version": "7",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "oss-parent-7.pom",
+          "path": "org/sonatype/oss/oss-parent/7",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/org/sonatype/oss/oss-parent/7/oss-parent-7.pom"
+          ],
+          "sha256": "b51f8867c92b6a722499557fc3a1fdea77bdf9ef574722fe90ce436a29559454"
+        },
+        {
+          "id": {
+            "group": "org.sonatype.oss",
+            "name": "oss-parent",
+            "version": "9",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "oss-parent-9.pom",
+          "path": "org/sonatype/oss/oss-parent/9",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/org/sonatype/oss/oss-parent/9/oss-parent-9.pom"
+          ],
+          "sha256": "fb40265f982548212ff82e362e59732b2187ec6f0d80182885c14ef1f982827a"
+        },
+        {
+          "id": {
+            "group": "org.xerial",
+            "name": "sqlite-jdbc",
+            "version": "3.34.0",
+            "type": "jar",
+            "extension": "jar"
+          },
+          "name": "sqlite-jdbc-3.34.0.jar",
+          "path": "org/xerial/sqlite-jdbc/3.34.0",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/org/xerial/sqlite-jdbc/3.34.0/sqlite-jdbc-3.34.0.jar"
+          ],
+          "sha256": "605979c94e7fe00437f1e10dcfa657a23f125c8eb4d2f0ec17e3f84613894cc3"
+        },
+        {
+          "id": {
+            "group": "org.xerial",
+            "name": "sqlite-jdbc",
+            "version": "3.34.0",
+            "type": "pom",
+            "extension": "pom"
+          },
+          "name": "sqlite-jdbc-3.34.0.pom",
+          "path": "org/xerial/sqlite-jdbc/3.34.0",
+          "urls": [
+            "https://repo.maven.apache.org/maven2/org/xerial/sqlite-jdbc/3.34.0/sqlite-jdbc-3.34.0.pom"
+          ],
+          "sha256": "fdbe92119ef3852d5d4c59ab5fdb10560c378fd395dfbf24e2ebc0b94a5b3f81"
+        }
+      ]
+    }
+  }
+}
\ No newline at end of file
diff --git a/pkgs/mcaselector/gradle-env.nix b/pkgs/mcaselector/gradle-env.nix
new file mode 100644
index 0000000..b512f90
--- /dev/null
+++ b/pkgs/mcaselector/gradle-env.nix
@@ -0,0 +1,399 @@
+# This file is generated by gradle2nix.
+#
+# Example usage (e.g. in default.nix):
+#
+#     with (import <nixpkgs> {});
+#     let
+#       buildGradle = callPackage ./gradle-env.nix {};
+#     in
+#       buildGradle {
+#         envSpec = ./gradle-env.json;
+#
+#         src = ./.;
+#
+#         gradleFlags = [ "installDist" ];
+#
+#         installPhase = ''
+#           mkdir -p $out
+#           cp -r app/build/install/myproject $out
+#         '';
+#       }
+
+{ lib
+, stdenv
+, buildEnv
+, fetchs3
+, fetchurl
+, gradleGen
+, writeText
+, writeTextDir
+}:
+
+{
+# Path to the environment spec generated by gradle2nix (e.g. gradle-env.json).
+  envSpec
+, pname ? null
+, version ? null
+, enableParallelBuilding ? true
+# Arguments to Gradle used to build the project in buildPhase.
+, gradleFlags ? [ "build" ]
+# Gradle package to use instead of the one generated by gradle2nix.
+, gradlePackage ? null
+# Enable debugging for the Gradle build; this will cause Gradle to run a debug server
+# and wait for a JVM debugging client to attach.
+, enableDebug ? false
+# Additional code to run in the Gradle init script (init.gradle).
+, extraInit ? ""
+# Override the default JDK used to run Gradle itself.
+, buildJdk ? null
+# Override functions which fetch dependency artifacts.
+# Keys in this set are URL schemes such as "https" or "s3".
+# Values are functions which take a dependency in the form
+# `{ urls, sha256 }` and fetch into the Nix store. For example:
+#
+#   {
+#     s3 = { urls, sha256 }: fetchs3 {
+#       s3url = builtins.head urls;
+#       inherit sha256;
+#       region = "us-west-2";
+#       credentials = {
+#         access_key_id = "foo";
+#         secret_access_key = "bar";
+#       };
+#     };
+#   }
+, fetchers ? { }
+, ... } @ args:
+
+let
+  inherit (builtins)
+    attrValues concatStringsSep filter fromJSON getAttr head match
+    replaceStrings sort;
+
+  inherit (lib)
+    assertMsg concatMapStringsSep groupBy' hasSuffix hasPrefix last mapAttrs
+    mapAttrsToList optionalString readFile removeSuffix unique versionAtLeast
+    versionOlder;
+
+  fetchers' = {
+    http = fetchurl;
+    https = fetchurl;
+    s3 = { urls, sha256 }: fetchs3 {
+      s3url = head urls;
+      inherit sha256;
+    };
+  } // fetchers;
+
+  # Fetch urls using the scheme for the first entry only; there isn't a
+  # straightforward way to tell Nix to try multiple fetchers in turn
+  # and short-circuit on the first successful fetch.
+  fetch = { urls, sha256 }:
+    let
+      first = head urls;
+      scheme = head (builtins.match "([a-z0-9+.-]+)://.*" first);
+      fetch' = getAttr scheme fetchers';
+      urls' = filter (hasPrefix scheme) urls;
+    in
+      fetch' { urls = urls'; inherit sha256; };
+
+  mkDep = { name, path, urls, sha256, ... }: stdenv.mkDerivation {
+    inherit name;
+
+    src = fetch {
+      inherit urls sha256;
+    };
+
+    phases = "installPhase";
+
+    installPhase = ''
+      mkdir -p $out/${path}
+      ln -s $src $out/${path}/${name}
+    '';
+  };
+
+  mkModuleMetadata = deps:
+    let
+      ids = filter
+        (id: id.type == "pom")
+        (map (dep: dep.id) deps);
+
+      modules = groupBy'
+        (meta: id:
+          let
+            isNewer = versionOlder meta.latest id.version;
+            isNewerRelease =
+              !(hasSuffix "-SNAPSHOT" id.version) &&
+              versionOlder meta.release id.version;
+          in {
+            groupId = id.group;
+            artifactId = id.name;
+            latest = if isNewer then id.version else meta.latest;
+            release = if isNewerRelease then id.version else meta.release;
+            versions = meta.versions ++ [id.version];
+          }
+        )
+        {
+          latest = "";
+          release = "";
+          versions = [];
+        }
+        (id: "${replaceStrings ["."] ["/"] id.group}/${id.name}/maven-metadata.xml")
+        ids;
+
+    in
+      attrValues (mapAttrs (path: meta:
+        let
+          versions' = sort versionOlder (unique meta.versions);
+        in
+          with meta; writeTextDir path ''
+            <?xml version="1.0" encoding="UTF-8"?>
+            <metadata modelVersion="1.1">
+              <groupId>${groupId}</groupId>
+              <artifactId>${artifactId}</artifactId>
+              <versioning>
+                ${optionalString (latest != "") "<latest>${latest}</latest>"}
+                ${optionalString (release != "") "<release>${release}</release>"}
+                <versions>
+                  ${concatMapStringsSep "\n    " (v: "<version>${v}</version>") versions'}
+                </versions>
+              </versioning>
+            </metadata>
+          ''
+      ) modules);
+
+  mkSnapshotMetadata = deps:
+    let
+      snapshotDeps = filter (dep: dep ? build && dep ? timestamp) deps;
+
+      modules = groupBy'
+        (meta: dep:
+          let
+            id = dep.id;
+            isNewer = dep.build > meta.buildNumber;
+            # Timestamp values can be bogus, e.g. jitpack.io
+            updated = if (match "[0-9]{8}\.[0-9]{6}" dep.timestamp) != null
+                      then replaceStrings ["."] [""] dep.timestamp
+                      else "";
+          in {
+            groupId = id.group;
+            artifactId = id.name;
+            version = id.version;
+            timestamp = if isNewer then dep.timestamp else meta.timestamp;
+            buildNumber = if isNewer then dep.build else meta.buildNumber;
+            lastUpdated = if isNewer then updated else meta.lastUpdated;
+            versions = meta.versions or [] ++ [{
+              classifier = id.classifier or "";
+              extension = id.extension;
+              value = "${removeSuffix "-SNAPSHOT" id.version}-${dep.timestamp}-${toString dep.build}";
+              updated = updated;
+            }];
+          }
+        )
+        {
+          timestamp = "";
+          buildNumber = -1;
+          lastUpdated = "";
+        }
+        (dep: "${replaceStrings ["."] ["/"] dep.id.group}/${dep.id.name}/${dep.id.version}/maven-metadata.xml")
+        snapshotDeps;
+
+      mkSnapshotVersion = version: ''
+        <snapshotVersion>
+          ${optionalString (version.classifier != "") "<classifier>${version.classifier}</classifier>"}
+          <extension>${version.extension}</extension>
+          <value>${version.value}</value>
+          ${optionalString (version.updated != "") "<updated>${version.updated}</updated>"}
+        </snapshotVersion>
+      '';
+
+    in
+      attrValues (mapAttrs (path: meta:
+        with meta; writeTextDir path ''
+          <?xml version="1.0" encoding="UTF-8"?>
+          <metadata modelVersion="1.1">
+            <groupId>${groupId}</groupId>
+            <artifactId>${artifactId}</artifactId>
+            <version>${version}</version>
+            <versioning>
+              <snapshot>
+                ${optionalString (timestamp != "") "<timestamp>${timestamp}</timestamp>"}
+                ${optionalString (buildNumber != -1) "<buildNumber>${toString buildNumber}</buildNumber>"}
+              </snapshot>
+              ${optionalString (lastUpdated != "") "<lastUpdated>${lastUpdated}</lastUpdated>"}
+              <snapshotVersions>
+                ${concatMapStringsSep "\n    " mkSnapshotVersion versions}
+              </snapshotVersions>
+            </versioning>
+          </metadata>
+        ''
+      ) modules);
+
+  mkRepo = project: type: deps: buildEnv {
+    name = "${project}-gradle-${type}-env";
+    paths = map mkDep deps ++ mkModuleMetadata deps ++ mkSnapshotMetadata deps;
+  };
+
+  mkInitScript = projectSpec: gradle:
+    let
+      repos = mapAttrs (mkRepo projectSpec.name) projectSpec.dependencies;
+      hasDependencies = mapAttrs (type: deps: deps != []) projectSpec.dependencies;
+
+      inSettings = pred: script:
+        optionalString pred (
+          if versionAtLeast gradle.version "6.0" then ''
+            gradle.beforeSettings {
+              ${script}
+            }
+          '' else ''
+            gradle.settingsEvaluated {
+              ${script}
+            }
+          ''
+        );
+    in
+      assert (assertMsg (hasDependencies.settings -> versionAtLeast gradle.version "6.0") ''
+        Project `${projectSpec.name}' has settings script dependencies, such as settings
+        plugins, which are not supported by gradle2nix for Gradle versions prior to 6.0.
+
+        Potential remedies:
+        - Pass `--gradle-version=<version>' to the gradle2nix command.
+        - Patch the `settings.gradle[.kts]' file to remove script dependencies.
+      '');
+
+      writeText "init.gradle" ''
+        static def offlineRepo(RepositoryHandler repositories, String env, String path) {
+            repositories.clear()
+            repositories.maven {
+                name "Nix''${env.capitalize()}MavenOffline"
+                url path
+                metadataSources {
+                    it.gradleMetadata()
+                    it.mavenPom()
+                    it.artifact()
+                }
+            }
+            repositories.ivy {
+                name "Nix''${env.capitalize()}IvyOffline"
+                url path
+                layout "maven"
+                metadataSources {
+                    it.gradleMetadata()
+                    it.ivyDescriptor()
+                    it.artifact()
+                }
+            }
+        }
+
+        ${inSettings (hasDependencies.settings && (versionAtLeast gradle.version "6.0")) ''
+          offlineRepo(it.buildscript.repositories, "settings", "${repos.settings}")
+        ''}
+
+        ${inSettings (hasDependencies.plugin) ''
+            offlineRepo(it.pluginManagement.repositories, "plugin", "${repos.plugin}")
+        ''}
+
+        ${optionalString (hasDependencies.buildscript) ''
+          gradle.projectsLoaded {
+              allprojects {
+                  buildscript {
+                      offlineRepo(repositories, "buildscript", "${repos.buildscript}")
+                  }
+              }
+          }
+        ''}
+
+        ${optionalString (hasDependencies.project) (
+          if versionAtLeast gradle.version "6.8"
+          then ''
+            gradle.beforeSettings {
+                it.dependencyResolutionManagement {
+                    offlineRepo(repositories, "project", "${repos.project}")
+                    repositoriesMode.set(RepositoriesMode.PREFER_SETTINGS)
+                }
+            }
+          ''
+          else ''
+            gradle.projectsLoaded {
+                allprojects {
+                    offlineRepo(repositories, "project", "${repos.project}")
+                }
+            }
+          ''
+        )}
+
+        ${extraInit}
+      '';
+
+  mkGradle = gradleSpec:
+    gradleGen.gradleGen {
+      inherit (gradleSpec) nativeVersion;
+
+      name = "gradle-${gradleSpec.version}-${gradleSpec.type}";
+
+      src = fetchurl {
+        inherit (gradleSpec) url sha256;
+      };
+    } // {
+      inherit (gradleSpec) version;
+    };
+
+  mkProjectEnv = projectSpec: rec {
+    inherit (projectSpec) name path version;
+    gradle = args.gradlePackage or mkGradle projectSpec.gradle;
+    initScript = mkInitScript projectSpec gradle;
+  };
+
+  gradleEnv = mapAttrs
+    (_: p: mkProjectEnv p)
+    (fromJSON (readFile envSpec));
+
+  projectEnv = gradleEnv."";
+  pname = args.pname or projectEnv.name;
+  version = args.version or projectEnv.version;
+
+  buildProject = env: flags: ''
+    cp ${env.initScript} "$GRADLE_USER_HOME/init.d"
+
+    gradle --offline --no-daemon --no-build-cache \
+      --info --full-stacktrace --warning-mode=all \
+      ${optionalString enableParallelBuilding "--parallel"} \
+      ${optionalString enableDebug "-Dorg.gradle.debug=true"} \
+      ${optionalString (buildJdk != null) "-Dorg.gradle.java.home=${buildJdk.home}"} \
+      --init-script ${env.initScript} \
+      ${optionalString (env.path != "") ''-p "${env.path}"''} \
+      ${concatStringsSep " " flags}
+  '';
+
+  buildIncludedProjects =
+    concatStringsSep "\n" (mapAttrsToList
+      (_: env: buildProject env [ "build" ])
+      (removeAttrs gradleEnv [ "" ]));
+
+  buildRootProject = buildProject projectEnv gradleFlags;
+
+in stdenv.mkDerivation (args // {
+
+  inherit pname version;
+
+  nativeBuildInputs = (args.nativeBuildInputs or []) ++ [ projectEnv.gradle ];
+
+  buildPhase = args.buildPhase or ''
+    runHook preBuild
+
+    (
+    set -eux
+
+    # Work around https://github.com/gradle/gradle/issues/1055
+    TMPHOME="$(mktemp -d)"
+    mkdir -p "$TMPHOME/init.d"
+    export GRADLE_USER_HOME="$TMPHOME"
+
+    ${buildIncludedProjects}
+    ${buildRootProject}
+    )
+
+    runHook postBuild
+  '';
+
+  dontStrip = true;
+})