libtsm: fix building with clang for darwin

pkgs/development/libraries/libtsm/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, libxkbcommon, pkgconfig }:
+{ stdenv, lib, fetchurl, libxkbcommon, pkgconfig, autoconf, automake }:
 
 stdenv.mkDerivation rec {
   name = "libtsm-3";
@@ -8,14 +8,22 @@ stdenv.mkDerivation rec {
     sha256 = "01ygwrsxfii0pngfikgqsb4fxp8n1bbs47l7hck81h9b9bc1ah8i";
   };
 
-  buildInputs = [ libxkbcommon pkgconfig ];
+  buildInputs = [ libxkbcommon pkgconfig ] ++ lib.optionals stdenv.isDarwin [
+    autoconf automake
+   ];
+
+  preConfigure = lib.optionalString stdenv.isDarwin ''
+    aclocal
+  '';
 
   configureFlags = [ "--disable-debug" ];
 
-  meta = {
+  patches = lib.optional stdenv.isDarwin ./darwin.patch;
+
+  meta = with lib; {
     description = "Terminal-emulator State Machine";
     homepage = "http://www.freedesktop.org/wiki/Software/kmscon/libtsm/";
-    license = stdenv.lib.licenses.mit;
-    maintainers = [ stdenv.lib.maintainers.shlevy ];
+    license = licenses.mit;
+    maintainers = with maintainers; [ shlevy cstrahan ];
   };
 }