--- src/host/BUILD.toolchain.gn.in.orig	2022-11-08 21:18:48 UTC
+++ src/host/BUILD.toolchain.gn.in
@@ -6,7 +6,9 @@ gcc_toolchain("@GN_TOOLCHAIN@") {
   ld = "@CMAKE_CXX_COMPILER@"
   ar = "@CMAKE_AR@"
   nm = "@CMAKE_NM@"
-  extra_cppflags = ""
+  extra_cppflags = "%%CPPFLAGS%%"
+  extra_cxxflags = "%%CXXFLAGS%%"
+  extra_ldflags = "%%LDFLAGS%%"
   toolchain_args = {
     current_os = "@GN_OS@"
     current_cpu = "@GN_CPU@"