weechat: add python & perl to PATH so that extensions can run

pkgs/applications/networking/irc/weechat/default.nix

@@ -52,9 +52,11 @@ stdenv.mkDerivation rec {
 
   NIX_CFLAGS_COMPILE = "-I${python}/include/${python.libPrefix} -DCA_FILE=/etc/ssl/certs/ca-certificates.crt";
 
-  postInstall = ''
+  postInstall = with stdenv.lib; ''
     NIX_PYTHONPATH="$out/lib/${python.libPrefix}/site-packages"
     wrapProgram "$out/bin/weechat" \
+      ${optionalString perlSupport "--prefix PATH : ${perl}/bin"} \
+      --prefix PATH : ${pythonPackages.python}/bin \
       --prefix PYTHONPATH : "$PYTHONPATH" \
       --prefix PYTHONPATH : "$NIX_PYTHONPATH"
   '';