libxkbcommon: split version (for bitwig)

pkgs/development/libraries/libxkbcommon/libxkbcommon_7.nix

@@ -0,0 +1,32 @@
+{ stdenv, fetchurl, pkgconfig, yacc, flex, xkeyboard_config, libxcb, libX11 }:
+
+stdenv.mkDerivation rec {
+  name = "libxkbcommon-0.7.2";
+
+  src = fetchurl {
+    url = "http://xkbcommon.org/download/${name}.tar.xz";
+    sha256 = "1n5rv5n210kjnkyrvbh04gfwaa7zrmzy1393p8nyqfw66lkxr918";
+  };
+
+  outputs = [ "out" "dev" ];
+
+  nativeBuildInputs = [ pkgconfig ];
+  buildInputs = [ yacc flex xkeyboard_config libxcb ];
+
+  configureFlags = [
+    "--with-xkb-config-root=${xkeyboard_config}/etc/X11/xkb"
+    "--with-x-locale-root=${libX11.out}/share/X11/locale"
+  ];
+
+  preBuild = stdenv.lib.optionalString stdenv.isDarwin ''
+    sed -i 's/,--version-script=.*$//' Makefile
+  '';
+
+  meta = with stdenv.lib; {
+    description = "A library to handle keyboard descriptions";
+    homepage = http://xkbcommon.org;
+    license = licenses.mit;
+    maintainers = with maintainers; [ garbas ttuegel ];
+    platforms = with platforms; unix;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -11294,7 +11294,9 @@ with pkgs;
 
   libxdg_basedir = callPackage ../development/libraries/libxdg-basedir { };
 
-  libxkbcommon = callPackage ../development/libraries/libxkbcommon { };
+  libxkbcommon = libxkbcommon_8;
+  libxkbcommon_8 = callPackage ../development/libraries/libxkbcommon { };
+  libxkbcommon_7 = callPackage ../development/libraries/libxkbcommon/libxkbcommon_7.nix { };
 
   libxklavier = callPackage ../development/libraries/libxklavier { };