--- a/Makefile
+++ b/Makefile
@@ -23,8 +23,8 @@
 ### compiler
 
 ### gcc
-CC=gcc
-CFLAGS= -O -Werror -Wall -Wcast-qual -Wstrict-prototypes \
+CC ?= gcc
+CFLAGS += -Wall -Wcast-qual -Wstrict-prototypes \
 	-Wmissing-prototypes -Wmissing-declarations -Winline -Wcast-align 
 ### cc
 #CC=cc
@@ -72,7 +72,7 @@
 
 # compiler stuff
 # --------------
-CC_OPT= $(CFLAGS) -DFETCHLOG_VERSION_NO=\"$(FETCHLOG_VERSION)\" \
+CPPFLAGS += -DFETCHLOG_VERSION_NO=\"$(FETCHLOG_VERSION)\" \
 	$(HAS_MADVISE) $(HAS_REGEX)
 
 # all
@@ -82,7 +82,6 @@
 # fetchlog
 # -------
 fetchlog: fetchlog.c 
-	$(CC) $(CC_OPT) fetchlog.c -o fetchlog
 
 
 # install