How to install modules

[jaror]

@danidiaz

If, when installing the package, you omit the location of the package environment:

cabal install --lib random

then it updates a default package environment located somewhere in your home directory.

Note that this can cause conflicts (e.g. Cannot satisfy -package-id X11-1.9.1-As84WI1VImVHquwEDPbrTE - #9 by jaror), so the package-env method should be preferred.