* glvis@3.3: new package
* mesa-glu: now provides 'glu' (GL Utility library)
* openglu: add package, provides glu
* [GLVis] Use MakefilePackage as base. Add 'develop' version.
Small tweaks in the makefile arguments.
* [GLVis] Locate the X11, GL and GLU libraries within their respective
prefixes. Set the C compiler in the makefile arguments.
* [GLVis] Fix a bug: the same variable was used for two different things.
* [libx11] Add the libs property
* [OpenGL] Add the libs property
* [OpenGLU] Add the libs property
* [GLVis] Use the libs properties of libx11, opengl, and openglu
Activating a package that is already activated now sends a `tty.msg`
and returns.
```
-bash-4.2$ ~/spack/bin/spack activate aspell6-en
==> Package aspell6-en/lc4v24f is already activated.
```
* Better error message for spack providers
fixes#1355
`spack providers` now outputs a sensible error message if non-virtual
specs are provided as arguments:
```
$ spack providers mpi zlib petsc
==> Error: non-virtual specs cannot be part of the query [zlib, petsc]
```
Formatting of the output changed slightly.
* Calling 'spack providers' without arguments print the virtual pkg list
Also, the error message in case of a wrong parameter has been improved
to show the list of valid packages.
* Avoid printing headers if stdout is not a tty
* The provider list is formatted with colify if not in a tty
* Added a test to check the list of providers returned from the command
Popping the when spec from kwargs in the extends directive breaks
class inheritance. Inheriting classes do not find their when spec.
We now get the when spec from kwargs instead, leaving it to be found
by any downstream package classes.
* opengl: make error throw on install, not fetch
* opengl: add configuration advice for darwin
* opengl: add more versions of GL/OpenGL
* opengl: improve documentation in comments
* [OpenGL] Fix formatting
fixes#7593
Unit tests on OSX are trying to concretize mpileaks, and they fail due
to a conflict in the package:
"%gcc@7.2.0:" conflicts with "elfutils@0.163"
This solves the issue asking explicitly to concretize against
elfutils@1.170
fixes#7705
Package.provides now checks constraints to ensure that a spec provides
a given virtual package. Note that 'strict=True' is not passed to
satisfies as this function is also used during concretization.
