I'm facing an issue when installing BotDetect Plugin to handle captcha for Contact Form 7 in Wordpress.

Error: BotDetect requires the GD library and its support library: libpng, libjpeg and FreeType 2

Checking all the requirements and it's all installed

PHPINFO() returns:

GD Support  enabled
GD Version  bundled (2.1.0 compatible)
GIF Read Support    enabled
GIF Create Support  enabled
JPEG Support    enabled
libJPEG Version 6b
PNG Support enabled
libPNG Version  1.6.36
WBMP Support    enabled
XBM Support enabled


dpkg -l | grep libjpeg  //List shown
dpkg -l | grep libpng.  //List shown
dpkg -l | grep libfreetype. //List shown

Is there any other things I should check?

Thanks in advance