Further investigation suggests this is a not uncommon problem and may be due
to there being two versions of the GD library - a 'bundled' one and an
This is mentioned on the website, http://php.net/gd :
Note: Since PHP 4.3 there is a bundled version of the GD lib. This
bundled version has some additional features like alpha blending, and
should be used in preference to the external library since its codebase
is better maintained and more stable.
So you shouldn't really need to do anything anymore for GD stuff to
work, it's part of php (unless the person compiling php explicitly
doesn't include it).
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