# unconditionally pull-in librt with old glibc versions
AC_SEARCH_LIBS([clock_gettime], [rt], [], [])
+AC_SEARCH_LIBS([mq_unlink], [rt], [], [])
AC_ARG_WITH([libcap],
AS_HELP_STRING([--with-libcap=DIR], [Prefix for libcap]),
[CAP_LDFLAGS="-L$with_libcap/lib"],
[CAP_LDFLAGS=""])
save_LIBS="$LIBS"
+save_LDFLAGS="$LDFLAGS"
LIBS=
LDFLAGS="$LDFLAGS $CAP_LDFLAGS"
AC_SEARCH_LIBS([cap_init], [cap], [], [AC_MSG_ERROR([*** POSIX caps library not found])])
CAP_LIBS="$LIBS"
AC_SUBST(CAP_LIBS)
AC_SUBST(CAP_LDFLAGS)
+LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
AC_CHECK_FUNCS([memfd_create])