Francesco,

You can do 

spack spec dealii%clang

to see what spack will install. You can then check which package requires 
OpenGL (it is not deal.II) and then remove support for this package if you 
don't need it. For instance, let's say that it's trilinos that's pulling 
OpenGL and you don't need it, you can do

spack install dealii%clang~trilinos

Best,

Bruno

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