1 files changed, 6 insertions, 5 deletions
diff --git a/pkgs/os-specific/linux/checkpolicy/default.nix b/pkgs/os-specific/linux/checkpolicy/default.nix
index 9fbed50f3b9..8e01bb2a5c8 100644
--- a/pkgs/os-specific/linux/checkpolicy/default.nix
+++ b/pkgs/os-specific/linux/checkpolicy/default.nix
@@ -10,16 +10,17 @@ stdenv.mkDerivation rec {
     sha256 = "1m5wjm43lzp6bld8higsvdm2dkddydihhwv9qw2w9r4dm0largcv";
   };
 
+  # Don't build tests
+  postPatch = ''
+    sed '/-C test/d' -i Makefile
+    sed '1i#include <ctype.h>' -i checkpolicy.c
+  '';
+
   nativeBuildInputs = [ bison flex ];
   buildInputs = [ libsepol ];
 
   NIX_CFLAGS_COMPILE = "-fstack-protector-all";
 
-  # Don't build tests
-  postPatch = ''
-    sed -i '/-C test/d' Makefile
-  '';
-
   preBuild = ''
     makeFlagsArray+=("LEX=flex")
     makeFlagsArray+=("LIBDIR=${libsepol}/lib")