Since 7.4 replace "--with-gd" by "--enable-gd"
要激活 GD 支持，配置 PHP 时加上 --with-gd[=DIR] ，DIR 是 GD 的基本安装目录。要使用推荐的绑定的 GD 库版本（首次绑定于 PHP 4.3.0），使用 --with-gd 。要编译 GD 库，需要libpng 和 libjpeg。
在 Windows 中，需要将 GD2 的 DLL 文件 php_gd2.dll 作为一个扩展包含在 php.ini 中。GD1 的 DLL 文件 php_gd.dll 在 PHP 4.3.2 中被删除了。此外要注意首选的真彩色图像函数，例如 imagecreatetruecolor()，需要 GD2。
Note:
要在 Windows 下启用 exif，在 php.ini 中 php_mbstring.dll 必须在 php_exif.dll 之前加载。
要在 PHP 3 中禁止 GD 支持，在配置时加上 --without-gd 。
要增强 GD 的能力以处理更多的图像格式，在配置 PHP 时指定 --with-XXXX 的配置开关。
| 图像格式 | 配置开关 |
|---|---|
| jpeg-6b | 要激活 jpeg-6b 的支持，加上 --with-jpeg-dir=DIR . |
| png | 要激活 png 的支持，加上 --with-png-dir=DIR 。注意，libpng 需要 zlib library，因此配置中还要加上 --with-zlib-dir[=DIR] 。 |
| xpm | 要激活 xpm 的支持，加上 --with-xpm-dir=DIR 。如果配置时提示找不到所需要的库，可以加上到 X11 库的路径。 |
Note: 当把 PHP 和 libpng 一起编译时，必须使用和 GD 库连接的同一个版本。
要增强 GD 的能力以处理更多的字体，在配置 PHP 时指定 --with-XXXX 的配置开关。
| 字库 | 配置开关 |
|---|---|
| FreeType 1.x | 要激活 FreeType 1.x 的支持，加上 --with-ttf[=DIR] 。 |
| FreeType 2 | 要激活 FreeType 2 的支持，加上 --with-freetype-dir=DIR 。 |
| T1lib | 要激活 T1lib（Type 1 字体），加上 --with-t1lib[=DIR] 。 |
| 本地 TrueType 字符串函数 | 要激活本地 TrueType 字符串函数的支持，加上 --enable-gd-native-ttf 。 |
Since 7.4 replace "--with-gd" by "--enable-gd"
To install PHP GD extension on an Amazon Linux AMI server, with php 7:
sudo yum install php 70-gd
Do remember to restart Apache after the installation!
sudo service httpd restart
php --version if result is 7.2 version
sudo apt-get install php7.2-gd
On AntergosOS ( Arch linux )
*first run >>php -v and get current php version. In my case for PHP 7.1.14
sudo pacman -S php71-gd
then restart you apache server using,
sudo systemctl restart httpd
#install under Ubuntu 16.04:
* if you have access to PHP7.1:
<sudo> apt install php7.1-gd && <sudo> systemctl restart apache2
* if you have access to PHP7.0:
<sudo> apt install php7.0-gd && <sudo> systemctl restart apache2
------------------------------------------------
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To install on CentOS:
yum install php-gd
For all who use php 7 and ubuntu
sudo apt-get install php7.0-gd
On Ubuntu I was missing the libpng-dev, libjpeg-dev (and in my case) libwebp-dev libraries, all gettable with apt-get.
Also once those libraries are installed, including --with-png-dir --with-jpeg-dir --with-webp-dir, without any values (i.e. =/dir) appeared to be valid ... though admittedly I didn't try without (in case the configure script autodetected them).
Instructions how to compile bundled version on Linux:
http://stackoverflow.com/questions/35560150/php-gd-bundled-extension-without-recompiling-php-solution
If you are using PHPBREW , the extension is called gd.
So you do.
```
phpbrew ext install gd
```
It will compile the extension to the core.
sudo apt-get install php5-gd && sudo service apache2 restart
To install under Ubuntu 14.04.
On Macox lion with mac port just use:
sudo port install php5-gd
People having difficulties setting the --with-libdir option needs to set it like this :
--with-libdir=lib64
That option works fine. Doing --with-libdir=/usr/lib64 doesn't work because the configure script prepends the --prefix option before the --with-libdir option. So, doing --with-libdir=/usr/lib64 makes the configure script to look for libs in /usr/usr/lib64, which is wrong of course, and not in /usr/lib64.
I also had to install the libgd package in addition to php5-gd:
sudo apt-get install libgd2-xpm-dev*
I was running PHP on a SUSE box on amazon EC2.
to get gd to work all I had to do was to run:
> yast -i php5_gd
and when that completed I just restarted apache. voila!
To get GD bundled under Ubuntu, the way to recompile php5 with gd is described here (french) http://doc.ubuntu-fr.org/modules_php#php5-gd
If you have already compiled PHP and want to recompile '--with-gd', don't forget to run 'make clean' first!
It should be noted that it might be pretty easy to install gd without the need to recompile php, when using debian:
apt-get install php5-gd