Detecting gl2ps in ./configure step

[José Luis García Pallero]

Hello:

If I run ./configure on the development sources and I have not
installed the gl2ps library, its absence is not warned by the script,
and the sources can be compiled without errors. Then, it is impossible
to use the print() function with ftlk. It could be nice that the
configure script emits a warning if gl2ps is not present in order to
alert the user, as fltk is now the default graphics core

Best regards

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José Luis García Pallero
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