构建遇到的问题如下：
"_res_9_dn_expand", referenced from:_php_parserr in dns.o_php_parserr in dns.o_php_parserr in dns.o_php_parserr in dns.o_php_parserr in dns.o_php_parserr in dns.o_zif_dns_get_mx in dns.o..."_res_9_dn_skipname", referenced from:_zif_dns_get_record in dns.o_zif_dns_get_mx in dns.o_zif_dns_get_mx in dns.o"_res_9_init", referenced from:_zif_dns_check_record in dns.o_zif_dns_get_record in dns.o_zif_dns_get_mx in dns.o"_res_9_search", referenced from:_zif_dns_check_record in dns.o_zif_dns_get_record in dns.o_zif_dns_get_mx in dns.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
解决方法：
- 编辑
/opt/local/var/macports/sources/rsync.macports.org/macports/release/tarballs/ports/lang/php/Portfile； - 在大概 350 行前后找到
if {[vercmp ${branch} < 8.0]}，这是判定 PHP 版本是否小于 8.0 - 在判定内加上
configure.args-append EXTRA_LIBS=-lresolv - 保存后执行
sudo port install php74即可
修改的位置：
