linux重新编译安装gd，增加freetype支持,解决验证码不显示问题，Fatal error: Call to undefined function imagettftext()

问题：

Fatal error: Call to undefined function Think\imagettftext() in /var/www/webreg/ThinkPHP/Library/Think/Verify.class.php on line 143

查看phpinfo()后得知，gd中没有freetype的支持

解决：

首先安装freestyle,php-gd

确保先安装freestyle，然后是php-gd；如果是先安装了php-gd,那么在安装完freestyle后，需要make clean。（这句很重要，弄了很多此,,,在这）

然后重新配置编译参数如下： 

1.到【你的php源码解压目录】/ext/gd

make clean./configure --with-mysql --prefix=/homewww/php --with-apxs2=/homewww/httpd/bin/apxs --with-config-file-path=/homewww/php/conf --with-gd --enable-exif --enable-gd-native-ttf --enable-inline-optimization --with-zlib --with-png-dir --with-jpeg-dir=/usr/local/jpeg --with-freetype-dir=/usr/local/lib --with-ttf --enable-mbstring --with-gettext --enable-gd-jis-convmake && make install2. 成功后提示如下，Installing shared extensions:     /homewww/php/lib/php/extensions/no-debug-zts-20100525/这样新编译的gd.so会在此路径下，需要cp到你的php.ini中配置的extension_dir的目录下即可。3.以apache为例，重启 apache，service httpd restart 4.另外，也有可能是libjpeg libpng zlib这些引起，按提示安装后编译进去即可。  这些依赖库包括freetype ,php-gd可通过yum install方式安装

好久没记录东西了，希望能帮到后来遇到问题的朋友。。。

----------------附上完整php编译参数：------------------------------------------------------------------------------------------------------------------------------------------

./configure \--prefix=/homewww/php \--with-apxs2=/homewww/httpd/bin/apxs \--with-config-file-path=/homewww/php/conf \--with-mysql \--with-mysqli \--with-mysql-sock \--enable-pdo \--with-pdo-mysql \--with-gd \--with-iconv  \--with-zlib \--enable-xml \--enable-bcmath \--enable-shmop \--enable-sysvsem \--enable-inline-optimization \--enable-mbregex \--enable-mbstring \--enable-gd-native-ttf \--with-openssl \--enable-pcntl \--enable-sockets \--with-xmlrpc \--enable-zip \--enable-soap \--without-pear \--with-gettext \--enable-session \--with-jpeg-dir=/usr/local/jpeg \--with-freetype-dir \--with-png-dir=/usr/local/pngp \--with-bz2 \