tbb: add pkg-config file

Gazebo does not list the tbb dependency in its pkg-config file otherwise.

pkgs/development/libraries/tbb/default.nix

@@ -51,6 +51,23 @@ stdenv.mkDerivation rec {
     runHook postInstall
   '';
 
+  postInstall = let
+    pcTemplate = fetchurl {
+      url = "https://github.com/oneapi-src/oneTBB/raw/master/integration/pkg-config/tbb.pc.in";
+      sha256 = "2pCad9txSpNbzac0vp/VY3x7HNySaYkbH3Rx8LK53pI=";
+    };
+  in ''
+    # Generate pkg-config file based on upstream template.
+    # It should not be necessary with tbb after 2021.2.
+    mkdir -p "$out/lib/pkgconfig"
+    substitute "${pcTemplate}" "$out/lib/pkgconfig/tbb.pc" \
+      --subst-var-by CMAKE_INSTALL_PREFIX "$out" \
+      --subst-var-by CMAKE_INSTALL_LIBDIR "lib" \
+      --subst-var-by CMAKE_INSTALL_INCLUDEDIR "include" \
+      --subst-var-by TBB_VERSION "${version}" \
+      --subst-var-by TBB_LIB_NAME "tbb"
+  '';
+
   meta = with lib; {
     description = "Intel Thread Building Blocks C++ Library";
     homepage = "http://threadingbuildingblocks.org/";