dnl A macro to check the availability and version of libnetlink

AC_DEFUN([AM_CHECK_LIBNL],

[

PKG_CHECK_MODULES(libnl, libnl-1 >= 1.1,[

HAVE_LIBNL=1

AC_SUBST(HAVE_LIBNL)

AC_DEFINE_UNQUOTED(HAVE_LIBNL, 1, [Build with libnetlink support])

AC_CHECK_HEADERS(netlink.h)

AC_CHECK_LIB(nl, nl_connect, [ LIBNL_LIBS="-lnl" ], [AC_MSG_ERROR([libnl is required])])

dnl Check if this particular version of libnl supports particular functions

AC_CHECK_LIB([nl],

[nl_socket_add_membership],

[AC_DEFINE([HAVE_NL_SOCKET_ADD_MEMBERSHIP], 1, [Does libnl have nl_socket_add_membership?])

],

)

AC_CHECK_LIB([nl],

[nl_socket_modify_cb],

[AC_DEFINE([HAVE_NL_SOCKET_MODIFY_CB], 1, [Does libnl have nl_socket_modify_cb?])

],

)

AC_CHECK_LIB([nl],

[nl_set_passcred],

[AC_DEFINE([HAVE_NL_SET_PASSCRED], 1, [Does libnl have nl_set_passcred?])

],

)

],[AC_MSG_WARN([Netlink support unavailable or too old])])

AC_SUBST(LIBNL_CFLAGS)

AC_SUBST(LIBNL_LIBS)

])