Update configure

configure

@@ -12,7 +12,7 @@ VAR=VALUE.
   LDFLAGS         C linker flags
 
   --prefix=<path> Set the install path
-  --debug Flags for debug build
+  --debug Flags for debug build, overides CFLAGS
 
 EOF
 exit 0
@@ -42,6 +42,7 @@ case "$arg" in
 CFLAGS=*) CFLAGS=${arg#*=} ;;
 LDFLAGS=*) LDFLAGS=${arg#*=} ;;
 CC=*) CC=${arg#*=} ;;
+*) prinf "Unrecognized option %s" $arg;;
 esac
 done