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-rw-r--r--pkgs/applications/version-management/cvs-fast-export/default.nix4
1 files changed, 4 insertions, 0 deletions
diff --git a/pkgs/applications/version-management/cvs-fast-export/default.nix b/pkgs/applications/version-management/cvs-fast-export/default.nix
index d6727d327ce..4c99078ab27 100644
--- a/pkgs/applications/version-management/cvs-fast-export/default.nix
+++ b/pkgs/applications/version-management/cvs-fast-export/default.nix
@@ -27,6 +27,10 @@ stdenv.mkDerivation rec {
     )
   '';
 
+  env = lib.optionalAttrs stdenv.cc.isClang {
+    NIX_CFLAGS_COMPILE = "-Wno-implicit-function-declaration";
+  };
+
   postInstall = ''
     wrapProgram $out/bin/cvssync --prefix PATH : ${lib.makeBinPath [ rsync ]}
     wrapProgram $out/bin/cvsconvert --prefix PATH : $out/bin:${lib.makeBinPath [