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-rw-r--r--pkgs/development/compilers/gnu-cim/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/compilers/gnu-cim/default.nix b/pkgs/development/compilers/gnu-cim/default.nix
index 54ba6cffff130..bf5b93c712fc5 100644
--- a/pkgs/development/compilers/gnu-cim/default.nix
+++ b/pkgs/development/compilers/gnu-cim/default.nix
@@ -23,12 +23,12 @@ 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;
 
   meta = with lib; {
-    description = "A GNU compiler for the programming language Simula";
+    description = "GNU compiler for the programming language Simula";
     longDescription = ''
       GNU Cim is a compiler for the programming language Simula.
       It offers a class concept, separate compilation with full type checking,