diff --git a/pkgs/applications/misc/sc-im/default.nix b/pkgs/applications/misc/sc-im/default.nix
index 2ec7f35a219b..d4509411dcfe 100644
--- a/pkgs/applications/misc/sc-im/default.nix
+++ b/pkgs/applications/misc/sc-im/default.nix
@@ -46,6 +46,8 @@ stdenv.mkDerivation rec {
 
   makeFlags = [ "prefix=${placeholder "out"}" ];
 
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang "-Wno-error=implicit-function-declaration";
+
   postInstall = ''
     wrapProgram "$out/bin/sc-im" --prefix PATH : "${lib.makeBinPath [ gnuplot ]}"
   '';