Confusing error message when "make" is missing

[yanjost]

If you try to use pythonbrew on a fresh system, without build tools installed (ok it's a bit silly), pythonbrew install X.Y.Z will fail and tell you to look at /home/user/.pythonbrew/log/build.log.

But you won't see anything there, because the error happens because "make" is missing, and this exception is silented.

Suggested behaviour : tell the user "make" is missing