Add test for NETWORK variable

[VictorEijkhout]

If the variable NETWORK is not set, CMake crashes. Please add a test for this being set before line 41.

[mayantaylor]

Can you clarify how you are running into this issue? Building Charm via the ./build script should not run into this problem. I'm wondering what the use case is for building via cmake direclty (this relates to your other issue as well I think)

[VictorEijkhout]

The use case for using cmake is that I have a build system that sets up all directories and such, and I only have to specify

CMAKEFLAGS= blah blah blah

and then everything builds.

Custom build scripts mean that I have to set up all that stuff by hand. A cmake installatin means that half an hour from downloading I have a package installed on 4 clusters times 3 compilers each.

Please use an industry standard rather than rolling your own install script. Please?