this is because Gem relies on OpenGL and thus you need OpenGL header to build it...

those few line should help to get the right things *before* running ./configure script 
apt-get update -qq
apt-get build-dep gem -qq
apt-get install libglfw-dev libglfw3-dev libsdl2-dev -qq

Also to enable vlc plugin you should install libvlc-dev pt-ackage :
apt-get install libvlc-dev

And since there are few discussion on building Gem on Linux, I thing we should start a "Hpw to build Gem on Ubuntu" wiki page.
Since there are now Travis script to do so automatically it should be quite straightforward. 

+
a


--
do it yourself                      
http://antoine.villeret.free.fr

2015-03-05 23:38 GMT+01:00 Csaba Láng <langcsaba@gmail.com>:
Dear list,

I have a fresh ubuntu 14.04 install on my old intel 32 based laptop.
Trying to install from git the latest Gem, but without success. After configure it says that openGL headers are missing.
Trying to get it but no luck.
Is there a simple way to get Gem VLC plugin worked? Now pd says there is not VLC backend, and it is true, as in the usr/lib/pd/extra/Gem folder the gem_videoVLC.so is missing.

Thanks:

Popesz

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