libdmapsharing: fix cross compilation

pkgs/development/libraries/libdmapsharing/default.nix

@@ -4,9 +4,7 @@
 , autoconf
 , automake
 , libtool
-, which
 , pkg-config
-, python3
 , vala
 , avahi
 , gdk-pixbuf
@@ -17,13 +15,20 @@
 , docbook_xml_dtd_43
 , gobject-introspection
 , libsoup_3
+, withGtkDoc ? stdenv.buildPlatform.canExecute stdenv.hostPlatform
 }:
 
 stdenv.mkDerivation rec {
   pname = "libdmapsharing";
   version = "3.9.13";
 
-  outputs = [ "out" "dev" "devdoc" ];
+  outputs = [
+    "out"
+    "dev"
+  ] ++ lib.optionals withGtkDoc [
+    "devdoc"
+  ];
+
   outputBin = "dev";
 
   src = fetchFromGitLab {
@@ -34,16 +39,17 @@ stdenv.mkDerivation rec {
     sha256 = "oR9lpOFxgGfrtzncFT6dbmhKQfcuH/NvhOR/USHAHQc=";
   };
 
+  strictDeps = true;
+
   nativeBuildInputs = [
     autoconf
     automake
     libtool
-    which
+    gtk-doc # gtkdocize
     pkg-config
-    python3
     gobject-introspection
     vala
-    gtk-doc
+  ] ++ lib.optionals withGtkDoc [
     docbook-xsl-nons
     docbook_xml_dtd_43
   ];
@@ -53,6 +59,8 @@ stdenv.mkDerivation rec {
     gdk-pixbuf
     gst_all_1.gstreamer
     gst_all_1.gst-plugins-base
+  ] ++ lib.optionals withGtkDoc [
+    gtk-doc
   ];
 
   propagatedBuildInputs = [
@@ -61,10 +69,15 @@ stdenv.mkDerivation rec {
   ];
 
   configureFlags = [
-    "--enable-gtk-doc"
-    "--disable-tests" # Tests require mDNS server.
+    (lib.enableFeature false "tests") # Tests require mDNS server
+    (lib.enableFeature withGtkDoc "gtk-doc")
   ];
 
+  postPatch = ''
+    substituteInPlace configure.ac \
+      --replace-fail pkg-config "$PKG_CONFIG"
+  '';
+
   preConfigure = ''
     NOCONFIGURE=1 ./autogen.sh
   '';