+# Under Solaris, the `xnet' library provides `recvmsg' which complies with the
+# X/Open CAE Specification.
+with_libxnet="no"
+AC_CHECK_LIB(xnet, __xnet_recvmsg, [with_libxnet="yes"],[])
+if test "x$with_libxnet" = "xyes"
+then
+ CPPFLAGS="$CPPFLAGS -D_XPG4_2 -D__EXTENSIONS__"
+fi
+AM_CONDITIONAL(BUILD_WITH_LIBXNET, test "x$with_libxnet" = "xyes")
+