rcs: Use c99 on darwin

Shea Levy b661ebe3 2d4b6405

+2
+2
pkgs/applications/version-management/rcs/default.nix
··· 12 12 13 13 doCheck = true; 14 14 15 + NIX_CFLAGS_COMPILE = if stdenv.isDarwin then "-std=gnu99" else null; 16 + 15 17 meta = { 16 18 homepage = http://www.gnu.org/software/rcs/; 17 19 description = "Revision control system";