--- a/libc/sunrpc/Makefile
+++ b/libc/sunrpc/Makefile
@@ -175,7 +175,7 @@ $(objpfx)rpcgen: $(addprefix $(objpfx),$
 	$(+link)
 
 $(addprefix $(objpfx)cross-,$(rpcgen-objs)): $(objpfx)cross-%.o: %.c
-	gcc $< -c -D_RPC_THREAD_SAFE_ -D_CROSS_RPCGEN_ \
+	gcc $< -c -D_RPC_THREAD_SAFE_ -D_CROSS_RPCGEN_ $(HOST_CFLAGS) \
 		$(OUTPUT_OPTION) $(compile-mkdep-flags)
 
 $(objpfx)cross-rpcgen: $(addprefix $(objpfx)cross-,$(rpcgen-objs))
--- a/libc/timezone/Makefile
+++ b/libc/timezone/Makefile
@@ -182,7 +182,7 @@ $(objpfx)zic: $(addprefix $(objpfx), $(z
 
 $(addprefix $(objpfx)cross-,$(zic-objs)): $(objpfx)cross-%.o: %.c
 	gcc $< -c $(OUTPUT_OPTION) $(CFLAGS-$*.c) $(CPPFLAGS-$*) \
-		-DCROSS_ZIC $(compile-mkdep-flags)
+		-DCROSS_ZIC $(HOST_CFLAGS) $(compile-mkdep-flags)
 
 $(objpfx)cross-zic: $(addprefix $(objpfx)cross-,$(zic-objs))
 	gcc $(addprefix $(objpfx)cross-,$(zic-objs)) -o $@