linux下為php添加GD庫的步驟如下：
一、下載
gd-2.0.33.tar.gz http://www.boutell.com/gd/
jpegsrc.v6b.tar.gz http://www.ijg.org/
libpng-1.2.7.tar.tar http://sourceforge.net/projects/libpng/
zlib-1.2.2.tar.gz http://sourceforge.net/projects/zlib/
freetype-2.1.9.tar.gz http://sourceforge.net/projects/freetype/
php-4.3.9.tar.gz http://www.php.net
二、安裝
1.安裝zlib
tar zxvf zlib-1.2.2.tar.gz
cd zlib-1.2.2
./configure
make
make install
2.安裝libpng
tar zxvf libpng-1.2.7.tar.tar
cd libpng-1.2.7
cd scripts/
mv makefile.linux ../makefile
cd ..
make
make install
注意，這里的makefile不是用./configure生成，而是直接從scripts/里拷一個
【出錯的話：collect2: ld returned 1 exit status
make: *** [pngtest] Error 1
可以直接編譯./configure –prefix=/usr/local/libpng】
3.安裝freetype
tar zxvf freetype-2.1.9.tar.gz
cd freetype-2.1.9
./configure
make
make install
4.安裝Jpeg
tar zxvf jpegsrc.v6b.tar.gz
cd jpeg-6b/
./configure --enable-shared
make
make test
make install
注意，這里configure一定要帶--enable-shared參數，不然，不會生成共享庫
5.安裝GD
tar zxvf gd-2.0.33.tar.gz
cd gd-2.0.33
./configure --with-png --with-freetype --with-jpeg
make install
6.重新編譯PHP
tar zxvf php-4.3.9.tar.gz
cd php-4.3.9
./configure (以前的參數) --with-gd --enable-gd-native-ttf --with-zlib --with-png --with-jpeg --with-freetype --enable-sockets
make
make install
<?php
phpinfo();
?>
Ok.....