Index: arch/makefile
==================================================================
--- arch/makefile
+++ arch/makefile
@@ -1,12 +1,9 @@
-lin-headers = /usr/include/asm
-fbsd-headers = /usr/include/sys
-
 ${TMP}:
 	mkdir -p ${TMP}
 
-${TMP}/calls.x86.lin.32.s: $(lin-headers)/unistd_32.h ${TMP}
+${TMP}/calls.x86.lin.32.s: ${lin-headers}/unistd_32.h ${TMP}
 	grep "#define __NR_" $< | sed 's;^#define __NR_;%define sys.;' > $@
-${TMP}/calls.x86.lin.64.s: $(lin-headers)/unistd_64.h ${TMP}
+${TMP}/calls.x86.lin.64.s: ${lin-headers}/unistd_64.h ${TMP}
 	grep "#define __NR_" $< | sed 's;^#define __NR_;%define sys.;' > $@
-${TMP}/calls.x86.fbsd.%.s: $(fbsd-headers)/syscall.h ${TMP}
+${TMP}/calls.x86.fbsd.%.s: ${fbsd-headers}/syscall.h ${TMP}
 	grep "#define	SYS_" $< | sed 's;^#define	SYS_;%define sys.;' > $@

Index: makefile
==================================================================
--- makefile
+++ makefile
@@ -5,10 +5,13 @@
 export BITS = 64
 export TMP = $(PWD)/tmp
 
 export TARGET = $(ARCH).$(OS).$(BITS)
 
+export lin-headers = /usr/include/asm
+export fbsd-headers = /usr/include/sys
+
 moddirs = $(wildcard k*)
 binaries = $(wildcard k*/*.exe.c)
 functions = $(wildcard k*/*.fn.c) 
 assemblies = $(wildcard k*/*.fn.${TARGET}.s)
 binmods = $(sort $(dir $(binaries)))