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-rw-r--r--pkgs/development/compilers/gnu-cim/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/compilers/gnu-cim/default.nix b/pkgs/development/compilers/gnu-cim/default.nix
index 54ba6cffff130..f689517196a17 100644
--- a/pkgs/development/compilers/gnu-cim/default.nix
+++ b/pkgs/development/compilers/gnu-cim/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
     done
   '';
 
-  CFLAGS = lib.optionalString stdenv.cc.isClang "-Wno-return-type";
+  env.CFLAGS = lib.optionalString stdenv.cc.isClang "-Wno-return-type -Wno-error=implicit-function-declaration -Wno-error=implicit-int";
 
   doCheck = true;