libphonenumber: allow building without openjdk

pkgs/by-name/li/libphonenumber/package.nix

@@ -4,6 +4,7 @@
   fetchFromGitHub,
   buildPackages,
   cmake,
+  enableTests ? true,
   gtest,
   jre,
   pkg-config,
@@ -31,27 +32,36 @@ stdenv.mkDerivation (finalAttrs: {
 
   nativeBuildInputs = [
     cmake
+    pkg-config
+  ]
+  ++ lib.optionals enableTests [
     gtest
     jre
-    pkg-config
   ];
 
   buildInputs = [
-    boost
     icu
     protobuf
+  ]
+  ++ lib.optionals enableTests [
+    boost
   ];
 
   cmakeDir = "../cpp";
 
-  doCheck = true;
+  doCheck = enableTests;
 
   checkTarget = "tests";
 
-  cmakeFlags = lib.optionals (!stdenv.buildPlatform.canExecute stdenv.hostPlatform) [
-    (lib.cmakeFeature "CMAKE_CROSSCOMPILING_EMULATOR" (stdenv.hostPlatform.emulator buildPackages))
-    (lib.cmakeFeature "PROTOC_BIN" (lib.getExe buildPackages.protobuf))
-  ];
+  cmakeFlags =
+    lib.optionals (!enableTests) [
+      (lib.cmakeBool "REGENERATE_METADATA" false)
+      (lib.cmakeBool "USE_BOOST" false)
+    ]
+    ++ lib.optionals (!stdenv.buildPlatform.canExecute stdenv.hostPlatform) [
+      (lib.cmakeFeature "CMAKE_CROSSCOMPILING_EMULATOR" (stdenv.hostPlatform.emulator buildPackages))
+      (lib.cmakeFeature "PROTOC_BIN" (lib.getExe buildPackages.protobuf))
+    ];
 
   meta = with lib; {
     changelog = "https://github.com/google/libphonenumber/blob/${finalAttrs.src.rev}/release_notes.txt";