diff --git a/pkgs/by-name/li/librep/package.nix b/pkgs/by-name/li/librep/package.nix
index bc6b148962ff..df4f05cb0d90 100644
--- a/pkgs/by-name/li/librep/package.nix
+++ b/pkgs/by-name/li/librep/package.nix
@@ -49,6 +49,8 @@ stdenv.mkDerivation (finalAttrs: {
   strictDeps = true;
   enableParallelBuilding = true;
 
+  env.NIX_CFLAGS_COMPILE = "-Wno-error=incompatible-pointer-types";
+
   # ensure libsystem/ctype functions don't get duplicated when using clang
   configureFlags = lib.optionals stdenv.hostPlatform.isDarwin [ "CFLAGS=-std=gnu89" ];
 
diff --git a/pkgs/by-name/sa/sawfish/package.nix b/pkgs/by-name/sa/sawfish/package.nix
index 677a28140ec8..8aea5efda288 100644
--- a/pkgs/by-name/sa/sawfish/package.nix
+++ b/pkgs/by-name/sa/sawfish/package.nix
@@ -77,6 +77,10 @@ stdenv.mkDerivation (finalAttrs: {
     done
   '';
 
+  # fixes:
+  # sawfish.h:52:13: error: 'bool' cannot be defined via 'typedef'
+  env.NIX_CFLAGS_COMPILE = "-std=gnu17";
+
   nativeInstallCheckInputs = [
     versionCheckHook
   ];