--- Makefile.orig	Thu Oct  2 12:23:22 1997
+++ Makefile	Mon May  1 22:19:06 2006
@@ -1,11 +1,13 @@
 DEST_DIR = 	../exec
 DEST=		${DEST_DIR}/chaco
-CC = 		gcc
+CC ?= 		cc
 IFLAG =		-Imain
-CFLAGS =	-O2
-OFLAGS =	-O2
+CFLAGS =	@CFLAGS@
+OFLAGS +=	-O2
 
-FILES.c=	main/user_params.c main/interface.c main/main.c \
+main_file=	 main/main.c
+
+libFILES.c=	main/user_params.c main/interface.c \
 		submain/balance.c submain/divide.c submain/submain.c \
 		input/input_assign.c \
 		input/check_input.c input/input.c input/input_geom.c \
@@ -87,11 +89,20 @@
 		util/update.c  util/vecout.c util/vecran.c \
                 util/vecscale.c 
 
+FILES.c=	$(libFILES.c) $(main_file)
+
 FILES.o=	$(FILES.c:.c=.o) 
 
+libFILES.o=	$(libFILES.c:.c=.o)
+
+all: ${DEST} ${DEST_DIR}/libchaco.a
 
 ${DEST}:	${FILES.o} Makefile
 		${CC} ${OFLAGS} ${FILES.o} -lm -o ${DEST}
+
+${DEST_DIR}/libchaco.a:	${libFILES.o} Makefile
+		ar r ${DEST_DIR}/libchaco.a ${libFILES.o}
+		ranlib ${DEST_DIR}/libchaco.a
 
 lint:
 		lint ${IFLAG} ${FILES.c} -lm