AC_ARG_WITH(slang, AC_HELP_STRING([--with-slang[=DIR]], [Use S-Lang instead of ncurses]),
[AC_CACHE_CHECK([if this is a BSD system], mutt_cv_bsdish,
[AC_TRY_RUN([#include <sys/param.h>
AC_ARG_WITH(slang, AC_HELP_STRING([--with-slang[=DIR]], [Use S-Lang instead of ncurses]),
[AC_CACHE_CHECK([if this is a BSD system], mutt_cv_bsdish,
[AC_TRY_RUN([#include <sys/param.h>