cpp-utilities: address common issues in the derivation

pkgs/development/libraries/cpp-utilities/default.nix

@@ -1,7 +1,6 @@
 { stdenv
 , lib
 , fetchFromGitHub
-, fetchpatch
 , cmake
 , cppunit
 }:
@@ -20,13 +19,17 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ cmake ];
   checkInputs = [ cppunit ];
   # Otherwise, tests fail since the resulting shared object libc++utilities.so is only available in PWD of the make files
-  checkFlagsArray = [ "LD_LIBRARY_PATH=$(PWD)" ];
+  preCheck = ''
+    checkFlagsArray+=(
+      "LD_LIBRARY_PATH=$PWD"
+    )
+  '';
   doCheck = true;
 
   meta = with lib; {
     homepage = "https://github.com/Martchus/cpp-utilities";
     description = "Common C++ classes and routines used by @Martchus' applications featuring argument parser, IO and conversion utilities";
-    license = licenses.gpl2;
+    license = licenses.gpl2Plus;
     maintainers = with maintainers; [ doronbehar ];
     platforms = platforms.linux;
   };