tkrzw: fix building on impure platforms

pkgs/development/libraries/tkrzw/default.nix

@@ -10,12 +10,16 @@ stdenv.mkDerivation rec {
     hash = "sha256-G7SVKgU4b8I5iwAlGHL/w8z0fhI+Awe3V6aqFsOnUrA=";
   };
 
+  postPatch = ''
+    substituteInPlace configure \
+      --replace 'PATH=".:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:$PATH"' ""
+  '';
+
   enableParallelBuilding = true;
 
   doCheck = false; # memory intensive
 
   meta = with lib; {
-    broken = stdenv.isDarwin;
     description = "A set of implementations of DBM";
     homepage = "https://dbmx.net/tkrzw/";
     maintainers = with maintainers; [ ehmry ];