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--- main.c.orig 2013-10-02 10:47:24.479295402 +0200 +++ main.c 2013-10-02 10:47:43.659318579 +0200 @@ -30,6 +30,7 @@ #include <sys/sysctl.h> #endif +extern int force_change; extern int dry_run; extern int list_only; extern int io_timeout;