- don't hardcode optimization
- pass -I${LOCALBASE}/include

Index: src/runtime/GNUmakefile
--- src/runtime/GNUmakefile.orig
+++ src/runtime/GNUmakefile
@@ -33,7 +33,7 @@ __LDFLAGS__ =
 
 include ../../output/prefix.def
 
-CFLAGS += -g -Wall -Wundef -Wsign-compare -Wpointer-arith -O3
+CFLAGS += -g -Wall -Wundef -Wsign-compare -Wpointer-arith -I/usr/local/include
 ASFLAGS += $(CFLAGS)
 CPPFLAGS += -I.