@@ -1,4 +1,5 @@
-calls.x86.lin.32.s: /usr/include/asm/unistd_32.h
+linux-headers = /usr/include/asm/
+calls.x86.lin.32.s: $(linux-headers)/unistd_32.h
 	grep "#define __NR_" $< | sed "s;^#define __NR_;%define sys.;" > $@
-calls.x86.lin.64.s: /usr/include/asm/unistd_64.h
+calls.x86.lin.64.s: $(linux-headers)/unistd_64.h
 	grep "#define __NR_" $< | sed "s;^#define __NR_;%define sys.;" > $@