diff --git a/pkgs/applications/networking/irc/weechat/default.nix b/pkgs/applications/networking/irc/weechat/default.nix
index b29ed46e075..71358c806d8 100644
--- a/pkgs/applications/networking/irc/weechat/default.nix
+++ b/pkgs/applications/networking/irc/weechat/default.nix
@@ -50,7 +50,9 @@ stdenv.mkDerivation rec {
     ++ optional  tclSupport      tcl
     ++ extraBuildInputs;
 
-  NIX_CFLAGS_COMPILE = "-I${python}/include/${python.libPrefix}";
+  NIX_CFLAGS_COMPILE = "-I${python}/include/${python.libPrefix}"
+    # Fix '_res_9_init: undefined symbol' error
+    + (stdenv.lib.optionalString stdenv.isDarwin "-DBIND_8_COMPAT=1");
 
   postInstall = with stdenv.lib; ''
     NIX_PYTHONPATH="$out/lib/${python.libPrefix}/site-packages"