@@ -1,5 +1,12 @@
-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: $(linux-headers)/unistd_64.h
-	grep "#define __NR_" $< | sed "s;^#define __NR_;%define sys.;" > $@
+lin-headers = /usr/include/asm
+fbsd-headers = /usr/include/sys
+
+${TMP}:
+	mkdir -p ${TMP}
+
+${TMP}/calls.x86.lin.32.s: $(lin-headers)/unistd_32.h ${TMP}
+	grep "#define __NR_" $< | sed 's;^#define __NR_;%define sys.;' > $@
+${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}
+	grep "#define	SYS_" $< | sed 's;^#define	SYS_;%define sys.;' > $@