Cmake compilation without root

[huntekah]

Hey! I've just had lovely few hours compiling marian (inside UEDINMS) for CPU translation. I've had many challenges and I think there is some room for improvement of installation process:

• It would be very usefull to have all necessary tools listed in a README.md or INSTALL.md (such as TCmalloc, MKL or BLAS). They are listed in your website, but In some cases README is the first thing to read :)
• It may be nice to add section you can install those libraries with conda (like MKL) because this little trick allows non-sudoers to install such libraries on their machines.
• cmake/FindMKL script didnt work on my system (arch lnux with libs installed by CONDA) and I had to manually set all the paths. I dont know how to improve this one, but anyway thought you may use this information to make your code better.

[emjotde]

Hi, TCMalloc and BLAS are not actually required, MKL is required only for CPU usage, when using the GPU it can be omitted.

Good to know about the conda part, not something we have explored yet. We will take a look at that. On the other hand it is hard to foresee people's specific favorite installers. I have never used conda in my life :)

If there is something you would like to write up into a paragraph about Arch or Conda, we can happily include it in the readme.

[emjotde]

@snukky Adding a few words on the minimal requirements to the README might be a good idea.