proj: fix paths in CMake and pkg-config files

pkgs/development/libraries/proj/default.nix

@@ -22,6 +22,19 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-zMP+WzC65BFz8g8mF5t7toqxmxCJePysd6WJuqpe8yg=";
   };
 
+  # https://github.com/OSGeo/PROJ/issues/3206
+  postPatch = ''
+    # NB will not apply once https://github.com/OSGeo/PROJ/pull/3150 is released
+    substituteInPlace cmake/ProjUtilities.cmake \
+      --replace '$\{exec_prefix\}/$'{PROJ_LIB_SUBDIR} '$'{CMAKE_INSTALL_FULL_LIBDIR} \
+      --replace '$\{prefix\}/$'{PROJ_INCLUDE_SUBDIR} '$'{CMAKE_INSTALL_FULL_INCLUDEDIR} \
+      --replace '$\{prefix\}/$'{CMAKE_INSTALL_DATAROOTDIR} '$'{CMAKE_INSTALL_FULL_DATAROOTDIR}
+    substituteInPlace cmake/project-config.cmake.in \
+      --replace '$'{_ROOT}/@INCLUDEDIR@ @CMAKE_INSTALL_FULL_INCLUDEDIR@ \
+      --replace '$'{_ROOT}/@LIBDIR@ @CMAKE_INSTALL_FULL_LIBDIR@ \
+      --replace '$'{_ROOT}/@BINDIR@ @CMAKE_INSTALL_FULL_BINDIR@
+  '';
+
   outputs = [ "out" "dev" ];
 
   nativeBuildInputs = [ cmake pkg-config ];