mac 编译php报错

最近才使用 mac 系统，编译 php 的时候如果不禁用 iconv ，编译能通过，但是 make 的时候会报错，具体情况写在下面，有朋友帮忙解释一下这个问题吗？

系统

macOS 10.14.2

config.nice 文件内容

#! /bin/sh
#
# Created by configure

'./configure' \
'--prefix=/usr/local/php/php7.3' \
'--with-config-file-scan-dir=/usr/local/php/php7.3/etc/conf.d' \
'--enable-pcntl' \
'--with-iconv=/usr/local/Cellar/libiconv/1.15/' \
"$@"

make 报错内容

Undefined symbols for architecture x86_64:
  "_libiconv", referenced from:
      _php_iconv_string in iconv.o
      __php_iconv_strlen in iconv.o
      _zif_iconv_substr in iconv.o
      __php_iconv_strpos in iconv.o
      _zif_iconv_mime_encode in iconv.o
      __php_iconv_appendl in iconv.o
      _php_iconv_stream_filter_append_bucket in iconv.o
      ...
  "_libiconv_close", referenced from:
      _php_iconv_string in iconv.o
      __php_iconv_strlen in iconv.o
      _zif_iconv_substr in iconv.o
      __php_iconv_strpos in iconv.o
      _zif_iconv_mime_encode in iconv.o
      __php_iconv_mime_decode in iconv.o
      _php_iconv_stream_filter_factory_create in iconv.o
      ...
  "_libiconv_open", referenced from:
      _php_iconv_string in iconv.o
      __php_iconv_strlen in iconv.o
      _zif_iconv_substr in iconv.o
      __php_iconv_strpos in iconv.o
      _zif_iconv_mime_encode in iconv.o
      __php_iconv_mime_decode in iconv.o
      _php_iconv_stream_filter_factory_create in iconv.o
      ...
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [sapi/cli/php] Error 1