-- Add system include directories for the bundled test code.
-- On FreeBSD the system library headers live under /usr/local/include,
-- but the upstream GN system_library configs only add the library link
-- flags. Without this the test-only image_diff target cannot find png.h
-- and similar headers.
--- third_party/BUILD.gn.orig	2026-09-24 10:33:33 UTC
+++ third_party/BUILD.gn
@@ -328,6 +328,7 @@ if (!build_with_chromium) {
   config("system_libjpeg_config") {
     libs = [ "jpeg" ]
     defines = [ "USE_SYSTEM_LIBJPEG" ]
+    include_dirs = [ "/usr/local/include" ]
   }
 
   config("libjpeg_turbo_config") {
@@ -451,6 +452,7 @@ if (!pdf_enable_rust_png) {
   config("system_libpng_config") {
     libs = [ "png" ]
     defines = [ "USE_SYSTEM_LIBPNG" ]
+    include_dirs = [ "/usr/local/include" ]
   }
 
   group("png") {