K. Piche: Unofficial patch for mailx. --- dotlock.c.orig 2005-09-18 20:28:20.000000000 -0400 +++ dotlock.c 2005-09-18 20:26:59.000000000 -0400 @@ -47,6 +47,7 @@ #include <errno.h> #include <signal.h> +#include "def.h" #include "extern.h" #ifndef O_SYNC