OpenGL linking problems

[David Doria <daviddoria at gmail dot com>]

I'm trying to build a library (VTK) in Cygwin. I am getting a lot of
errors like this

undefined reference to `_glDepthMask'
undefined reference to?`_glGetIntegerv'
undefined reference to?`_glMatrixMode'

I installed ALL of the cygwin packages to try to avoid problems like
this. I also added

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/lib

to my ~/.bash_profile

Anyone know how to get something to link against OpenGL in cygwin?

Thanks,

David

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