通过将php将至5.4来勉强支持freetype扩展，不推荐此方法
after upgrading to new Mac OS X Yosemite, i noticed that free type support is not working with php 5.5, so i had to downgrade to php 5.4 using homebrew
first install Xcode Command line Tool
xcode-select --install
then install Homebrew
then run the following commands
brew update
brew install homebrew/php/php54
then add the following to your ~/.bashrc
export PATH="$(brew --prefix homebrew/php/php54)/bin:$PATH"
then edit apache config /etc/apache2/httpd.conf
LoadModule php5_module /usr/local/opt/php54/libexec/apache2/libphp5.so
and comment the following ling
#LoadModule php5_module libexec/apache2/libphp5.so
restart apache
sudo apachectl restart
来源：
http://dev3k.com/blog/2014/10/mac-os-x-10-10-yosemite-php-5-5-14-free-type-support-fix/