我正在尝试向PHP GD安装添加一些功能。我正在使用Docker PHP“官方”发行版作为基础（php：7.1.15-fpm-jessie）。
我当前的生产环境使用CentOS，该GD模块带有FreeType，JPEG和PNG支持，如phpinfo输出所示：
GD Support => enabled
GD headers Version => 2.2.5
GD library Version => 2.2.5
FreeType Support => enabled
FreeType Linkage => with freetype
FreeType Version => 2.4.11
GIF Read Support => enabled
GIF Create Support => enabled
JPEG Support => enabled
libJPEG Version => 6b
PNG Support => enabled
libPNG Version => 1.5.13
WBMP Support => enabled
XPM Support => enabled
libXpm Version => 30411
XBM Support => enabled
WebP Support => enabled
Directive => Local …