gstreamer: Switch to meson build system

pkgs/development/libraries/gstreamer/core/default.nix

@@ -1,6 +1,7 @@
-{ stdenv, fetchurl, pkgconfig, perl, bison, flex, python, gobjectIntrospection
-, glib, makeWrapper
-, darwin
+{ stdenv, fetchurl, fetchpatch, meson, ninja
+, pkgconfig, gettext, gobjectIntrospection
+, bison, flex, python3, glib, makeWrapper
+, libcap,libunwind, darwin
 }:
 
 stdenv.mkDerivation rec {
@@ -19,28 +20,34 @@ stdenv.mkDerivation rec {
     sha256 = "0vj6k01lp2yva6rfd95fkyng9jdr62gkz0x8d2l81dyly1ki6dpw";
   };
 
+  patches = [ 
+    (fetchpatch {
+        url = "https://bug794856.bugzilla-attachments.gnome.org/attachment.cgi?id=370411";
+        sha256 = "16plzzmkk906k4892zq68j3c9z8vdma5nxzlviq20jfv04ykhmk2";
+    })
+    ./fix_pkgconfig_includedir.patch
+  ];
+
   outputs = [ "out" "dev" ];
   outputBin = "dev";
 
   nativeBuildInputs = [
-    pkgconfig perl bison flex python gobjectIntrospection makeWrapper
+    meson ninja pkgconfig gettext bison flex python3 makeWrapper gobjectIntrospection
   ];
-  buildInputs = stdenv.lib.optional stdenv.isDarwin darwin.apple_sdk.frameworks.CoreServices;
+  buildInputs = [ libcap libunwind ] ++ stdenv.lib.optional stdenv.isDarwin darwin.apple_sdk.frameworks.CoreServices;
 
   propagatedBuildInputs = [ glib ];
 
-  enableParallelBuilding = true;
-
-  preConfigure = ''
-    configureFlagsArray+=("--exec-prefix=$dev")
-  '';
-
   postInstall = ''
     for prog in "$dev/bin/"*; do
         wrapProgram "$prog" --suffix GST_PLUGIN_SYSTEM_PATH : "\$(unset _tmp; for profile in \$NIX_PROFILES; do _tmp="\$profile/lib/gstreamer-1.0''$\{_tmp:+:\}\$_tmp"; done; printf "\$_tmp")"
     done
   '';
 
+  preConfigure= ''
+    patchShebangs .
+  '';
+
   preFixup = ''
     moveToOutput "share/bash-completion" "$dev"
   '';