hello, 

first of all, the repository you used to cloned are outdated, and the Wiki page you linked to seems to be redundant with this one : http://puredata.info/docs/developer/GettingPdSource
anyway, the two are now up-to-date with (not so) new SourceForge URL syntax.

to update, see `git remote set-url` option, there is a similar command for SVN.

but please also note that current Gem master is not ready to release.

Concerning the error you get, did you try to run make despite of this error ?

As IOhannes said, you should also tell configure where you lib is.
Maybe you can do this with with GL_CFLAGS, GL_LIBS or CXX_FLAGS and LD_FLAGS.

why your Mesa installation is in /opt instead of /usr ?
when installing it from package repository, it should be well detected by ./configure

+
a

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

2014-11-01 19:52 GMT+01:00 Viacheslav Lotsmanov <lotsmanov89@gmail.com>:
There's no problem with linking with libGL, see:
```
$ ldd /usr/bin/glxgears | grep libGL
    libGL.so.1 => /usr/local/lib64/libGL.so.1 (0x00007fd00ac65000)
```

Here full log of Gem configure: http://pastebin.com/VuNDAjMM
Some about OpenGL:
```
checking GL/gl.h usability... yes
checking GL/gl.h presence... yes
checking for GL/gl.h... yes
checking OpenGL/gl.h usability... no
checking OpenGL/gl.h presence... no
checking for OpenGL/gl.h... no
```

On 1 November 2014 20:23, IOhannes m zmölnig <zmoelnig@iem.at> wrote:
> On 10/27/2014 01:04 AM, Viacheslav Lotsmanov wrote:
>>
>> configure: error: GL (headers) not found! you need openGL!!!
>> make[2]: *** [/home/unclechu/.compile_n_build/PD/2/pd-svn/externals/Gem/Gem.pd_linux]
>> Error 1
>> make[2]: Leaving directory
>> `/home/unclechu/.compile_n_build/PD/2/pd-svn/externals'
>> make[1]: *** [externals_install] Error 2
>> make[1]: Leaving directory
>> `/home/unclechu/.compile_n_build/PD/2/pd-svn/packages'
>> make: *** [install] Error 2
>> ```
>>
>> I have "/usr/local/include/GL" as symbolic link to /opt/Mesa-10.2.4/include/GL/
> [...]
>> What I'm doing wrong?
>>
>
> hard to tell without the output of Gem's configure.
> hint: openGL consists of more than just header-files...the linker needs
> to find libGL.so
>
>
> fgmadsr
> IOhannes
>
>
>
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