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-rw-r--r--pkgs/tools/graphics/pngcheck/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/graphics/pngcheck/default.nix b/pkgs/tools/graphics/pngcheck/default.nix
index 160badaf668bf..d288e7018e604 100644
--- a/pkgs/tools/graphics/pngcheck/default.nix
+++ b/pkgs/tools/graphics/pngcheck/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   # '';
 
   makefile = "Makefile.unx";
-  makeFlags = "ZPATH=${zlib}/lib";
+  makeFlags = "ZPATH=${zlib.out}/lib";
 
   buildInputs = [ zlib ];