diff --git a/Makefile b/Makefile
index ca8dd36..78fa789 100644
--- a/Makefile
+++ b/Makefile
@@ -5,6 +5,8 @@ CC= gcc
 #LDFLAGS= -g
 CFLAGS= $(RPM_OPT_FLAGS) -O3 -DSYSV -fomit-frame-pointer -Wall -fno-strength-reduce
 # -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+# -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE
+# $(shell getconf LFS_CFLAGS)
 LDFLAGS= -s
 
 # Look where your install program is.