使用任何php应用程序都会导致：

dyld: Library not loaded: /usr/local/lib/libpng15.15.dylib
Referenced from: /usr/local/bin/php
Reason: image not found
[1]    4494 trace trap  php

我的大多数php应用程序都是使用homebrew安装的，但composer除外（使用curl安装）

我尝试删除libpng并使用自制软件重新安装均无济于事。

接下来是按照错误消息中的说明切换到最新版本的libpng 1.5：

$ brew info libpng
libpng: stable 1.6.10 (bottled) 
http://www.libpng.org/pub/png/libpng.html
/usr/local/Cellar/libpng/1.5.17 (15 files, 1.0M)
Poured from bottle
/usr/local/Cellar/libpng/1.5.18 (15 files, 1.0M)
Poured from bottle
/usr/local/Cellar/libpng/1.6.10 (17 files, 1.3M) *

$ brew switch libpng 1.5.18
Cleaning /usr/local/Cellar/libpng/1.5.17
Cleaning /usr/local/Cellar/libpng/1.5.18
Cleaning /usr/local/Cellar/libpng/1.6.10
16 links created for /usr/local/Cellar/libpng/1.5.18

现在错误已更改为：

dyld: Library not loaded: /usr/local/lib/libpng16.16.dylib
Referenced from: /usr/local/lib/libfreetype.6.dylib
Reason: image not found
[1]    6993 trace trap  phpunit

我正在运行Mavericks（10.9.2）和PHP 5.5.1。

提前致谢！