--- third_party/yasm/BUILD.gn.orig	2017-06-05 19:03:29 UTC
+++ third_party/yasm/BUILD.gn
@@ -32,7 +32,12 @@ import("//build/config/compiler/compiler.gni")
 if (current_toolchain == host_toolchain) {
   # Various files referenced by multiple targets.
   yasm_gen_include_dir = "$target_gen_dir/include"
-  config_makefile = "source/config/$host_os/Makefile"
+  # HACK for All BSD derivatives use openbsd include directory
+  if (is_bsd) {
+    config_makefile = "source/config/openbsd/Makefile"
+  } else {
+    config_makefile = "source/config/$host_os/Makefile"
+  }
   version_file = "version.mac"
 
   import("//build/compiled_action.gni")