1 diff --git a/configure b/configure
2 index 50f3cad..31256c2 100755
5 @@ -21,10 +21,10 @@ datarootdir='$(prefix)/share'
6 infodir='$(datarootdir)/info'
7 mandir='$(datarootdir)/man'
11 -CFLAGS='-Wall -W -O2'
15 +CFLAGS?='-Wall -W -O2'
18 # checking whether we are using GNU C.
19 ${CC} --version > /dev/null 2>&1