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-rw-r--r--pkgs/development/libraries/libicns/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/libicns/default.nix b/pkgs/development/libraries/libicns/default.nix
index 1df2a8abb82..21ef0df743c 100644
--- a/pkgs/development/libraries/libicns/default.nix
+++ b/pkgs/development/libraries/libicns/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ autoreconfHook ];
   buildInputs = [ libpng openjpeg ];
-  NIX_CFLAGS_COMPILE = [ "-I${openjpeg.dev}/include/${openjpeg.incDir}" ];
+  NIX_CFLAGS_COMPILE = toString [ "-I${openjpeg.dev}/include/${openjpeg.incDir}" ];
 
   meta = with lib; {
     description = "Library for manipulation of the Mac OS icns resource format";