AC_ARG_WITH([os],

            [AC_HELP_STRING([--with-os=OS_TYPE], [Type of your operation system (fedora|redhat|suse|gentoo)])]

           )

osname=""

if test x"$with_os" != x ; then

    if test x"$with_os" = xfedora || \

       test x"$with_os" = xredhat || \

       test x"$with_os" = xsuse || \

       test x"$with_os" = xgentoo || \

       test x"$with_os" = xdebian ; then

        osname=$with_os

    else

        AC_MSG_ERROR([Illegal value -$with_os- for option --with-os])

    fi

fi

if test x"$osname" = x ; then

    if test -f /etc/fedora-release ; then

        osname="fedora"

    elif test -f /etc/redhat-release ; then

        osname="redhat"

    elif test -f /etc/SuSE-release ; then

        osname="suse"

    elif test -f /etc/debian_version ; then

        osname="debian"

    elif test -f /etc/gentoo-release ; then

        osname="gentoo"

    fi

    AC_MSG_NOTICE([Detected operating system type: $osname])

fi

AM_CONDITIONAL([HAVE_FEDORA], [test x"$osname" = xfedora])

AM_CONDITIONAL([HAVE_REDHAT], [test x"$osname" = xredhat])

AM_CONDITIONAL([HAVE_SUSE], [test x"$osname" = xsuse])

AM_CONDITIONAL([HAVE_DEBIAN], [test x"$osname" = xdebian])

AM_CONDITIONAL([HAVE_GENTOO], [test x"$osname" = xgentoo])

AC_CHECK_MEMBERS([struct ucred.pid, struct ucred.uid, struct ucred.gid], , ,

                 [[#include <sys/socket.h>]])

if test x"$ac_cv_member_struct_ucred_pid" = xyes -a \

        x"$ac_cv_member_struct_ucred_uid" = xyes -a \

        x"$ac_cv_member_struct_ucred_gid" = xyes ; then

    AC_DEFINE([HAVE_UCRED], [1], [Define if struct ucred is available])

else

    AC_MSG_ERROR([struct ucred is not available])

fi