diff --git a/pkgs/development/tools/misc/pkgconfig/default.nix b/pkgs/development/tools/misc/pkgconfig/default.nix
index 6eea0a6d5d6b..eabcebad31d0 100644
--- a/pkgs/development/tools/misc/pkgconfig/default.nix
+++ b/pkgs/development/tools/misc/pkgconfig/default.nix
@@ -10,9 +10,10 @@ stdenv.mkDerivation (rec {
     sha256 = "0sq09a39wj4cxf8l2jvkq067g08ywfma4v6nhprnf351s82pfl68";
   };
 
-  buildInputs = stdenv.lib.optional (stdenv.isCygwin || stdenv.isDarwin) libiconv;
+  buildInputs = stdenv.lib.optional (stdenv.isCygwin || stdenv.isDarwin || stdenv.isSunOS) libiconv;
 
-  configureFlags = [ "--with-internal-glib" ];
+  configureFlags = [ "--with-internal-glib" ]
+    ++ stdenv.lib.optional (stdenv.isSunOS) "--with-libiconv=gnu";
 
   patches = (if vanilla then [] else [
     # Process Requires.private properly, see