+
+dnl Autoconf 2.63 compatibility verison of macro introduced in Autoconf 2.64:
+m4_ifndef([AT_CHECK_UNQUOTED],
+ [m4_define([AT_CHECK_UNQUOTED],
+ [_AT_CHECK([$1], [$2], AS_ESCAPE(m4_dquote(m4_expand([$3])), [""]),
+ AS_ESCAPE(m4_dquote(m4_expand([$4])),[""]), [$5], [$6])])])
+
+dnl Autoconf 2.63 compatibility verison of macro introduced in Autoconf 2.64:
+m4_ifndef([AT_SKIP_IF],
+ [m4_define([AT_SKIP_IF],
+ [AT_CHECK([($1) \
+ && exit 77 || exit 0], [0], [ignore], [ignore])])])
+
+dnl Autoconf 2.63 compatibility verison of macro introduced in Autoconf 2.64:
+m4_ifndef([AT_FAIL_IF],
+ [m4_define([AT_FAIL_IF],
+ [AT_CHECK([($1) \
+ && exit 99 || exit 0], [0], [ignore], [ignore])])])