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AC_PROG_CRONTAB
Check for the program crontab, if exists let script continue, else pops an error message
Besides checking existence, this macro also set these environment variables upon completion:
CRONTAB = which crontab
1.2 (last modified: 2002-04-11)
Gleen Salmon <gleensalmon@yahoo.com>
AC_DEFUN([AC_PROG_CRONTAB],[
AC_REQUIRE([AC_EXEEXT])dnl
AC_PATH_PROG(CRONTAB, crontab$EXEEXT, nocommand)
if test "$CRONTAB" = nocommand; then
AC_MSG_ERROR([crontab (needed for scheduled job) not found in $PATH])
fi;dnl
])