--- makefile.orig	Wed Nov 12 11:47:13 2003
+++ makefile	Mon Nov 17 09:03:21 2003
@@ -20,8 +20,8 @@
 #
 ########################################################################
 
-CC         = cc
-CFLAGS     = -O
+CC         ?= cc
+CFLAGS     ?= -O
 SRC        = ./src
 
 # For MPI, mpicc will set up the proper include and library paths
@@ -81,7 +81,11 @@
 
 
 tcp: $(SRC)/tcp.c $(SRC)/netpipe.c $(SRC)/netpipe.h 
-	$(CC) $(CFLAGS) $(SRC)/netpipe.c $(SRC)/tcp.c -DTCP  -o NPtcp -I$(SRC)
+	$(CC) $(CFLAGS) $(SRC)/netpipe.c $(SRC)/tcp.c -DTCP -o NPtcp -I$(SRC)
+
+tcp6: $(SRC)/tcp.c $(SRC)/netpipe.c $(SRC)/netpipe.h 
+	$(CC) $(CFLAGS) $(SRC)/netpipe.c $(SRC)/tcp6.c -DTCP6 \
+		-o NPtcp6 -I$(SRC)
 
 memcpy: $(SRC)/memcpy.c $(SRC)/netpipe.c $(SRC)/netpipe.h
 	$(CC) $(CFLAGS) $(SRC)/netpipe.c $(SRC)/memcpy.c \