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-rw-r--r--pkgs/applications/networking/gopher/sacc/default.nix4
1 files changed, 4 insertions, 0 deletions
diff --git a/pkgs/applications/networking/gopher/sacc/default.nix b/pkgs/applications/networking/gopher/sacc/default.nix
index 046ae42ebcb..4d18f6a4f4a 100644
--- a/pkgs/applications/networking/gopher/sacc/default.nix
+++ b/pkgs/applications/networking/gopher/sacc/default.nix
@@ -15,6 +15,10 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ ncurses ];
 
+  CFLAGS = lib.optionals stdenv.isDarwin [
+    "-D_DARWIN_C_SOURCE"
+  ];
+
   postPatch = ''
     substituteInPlace config.mk \
       --replace curses ncurses \