gtest: fix includedir in cmake config files

pkgs/development/libraries/gtest/default.nix

@@ -12,6 +12,10 @@ stdenv.mkDerivation rec {
     sha256 = "0270msj6n7mggh4xqqjp54kswbl7mkcc8px1p5dqdpmw5ngh9fzk";
   };
 
+  patches = [
+    ./fix-cmake-config-includedir.patch
+  ];
+
   nativeBuildInputs = [ cmake ninja ];
 
   cmakeFlags = [

pkgs/development/libraries/gtest/fix-cmake-config-includedir.patch

@@ -0,0 +1,30 @@
+--- a/googlemock/CMakeLists.txt
++++ b/googlemock/CMakeLists.txt
+@@ -106,10 +106,10 @@
+ if (DEFINED CMAKE_VERSION AND NOT "${CMAKE_VERSION}" VERSION_LESS "2.8.11")
+   target_include_directories(gmock SYSTEM INTERFACE
+     "$<BUILD_INTERFACE:${gmock_build_include_dirs}>"
+-    "$<INSTALL_INTERFACE:$<INSTALL_PREFIX>/${CMAKE_INSTALL_INCLUDEDIR}>")
++    "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")
+   target_include_directories(gmock_main SYSTEM INTERFACE
+     "$<BUILD_INTERFACE:${gmock_build_include_dirs}>"
+-    "$<INSTALL_INTERFACE:$<INSTALL_PREFIX>/${CMAKE_INSTALL_INCLUDEDIR}>")
++    "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")
+ endif()
+ 
+ ########################################################################
+--- a/googletest/CMakeLists.txt
++++ b/googletest/CMakeLists.txt
+@@ -126,10 +126,10 @@
+ if (DEFINED CMAKE_VERSION AND NOT "${CMAKE_VERSION}" VERSION_LESS "2.8.11")
+   target_include_directories(gtest SYSTEM INTERFACE
+     "$<BUILD_INTERFACE:${gtest_build_include_dirs}>"
+-    "$<INSTALL_INTERFACE:$<INSTALL_PREFIX>/${CMAKE_INSTALL_INCLUDEDIR}>")
++    "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")
+   target_include_directories(gtest_main SYSTEM INTERFACE
+     "$<BUILD_INTERFACE:${gtest_build_include_dirs}>"
+-    "$<INSTALL_INTERFACE:$<INSTALL_PREFIX>/${CMAKE_INSTALL_INCLUDEDIR}>")
++    "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")
+ endif()
+ target_link_libraries(gtest_main PUBLIC gtest)
+