use colored unity-test

pkgs/u/unity-test/package.nix

@@ -5,10 +5,20 @@
   cmake,
 }:
 
-stdenv.mkDerivation (finalAttrs: {
+let
   pname = "unity-test";
   version = "2.6.1";
-
+  meta = {
+    description = "Unity Unit Testing Framework";
+    homepage = "https://www.throwtheswitch.org/unity";
+    license = lib.licenses.mit;
+    maintainers = [ lib.maintainers.i01011001 ];
+  };
+in
+stdenv.mkDerivation (finalAttrs: {
+  pname = pname;
+  version = version;
+  
   src = fetchFromGitHub {
     owner = "ThrowTheSwitch";
     repo = "Unity";
@@ -20,10 +30,21 @@ stdenv.mkDerivation (finalAttrs: {
   makeFlags = [ "UNITY_OUTPUT_COLOR=1" ];
   doCheck = true;
 
-  meta = {
-    description = "Unity Unit Testing Framework";
-    homepage = "https://www.throwtheswitch.org/unity";
-    license = lib.licenses.mit;
-    maintainers = [ lib.maintainers.i01011001 ];
-  };
+  postInstall = ''
+    mkdir -p $out/lib/pkgconfig
+    cat >$out/lib/pkgconfig/unity.pc <<EOF
+    prefix=$out
+    exec_prefix=\''${prefix}
+    libdir=$out/lib
+    includedir=\''${prefix}/include
+
+    Name: ${pname}
+    Description: ${meta.description}
+    Version: ${version}
+    Libs: -L\''${libdir} -lunity
+    Cflags: -I\''${includedir}
+    EOF
+  '';
+  
+
 })