Please don't. Running random scripts from the internets to install stuff is
a idiotic idea that deserves to die already.
Make your build process dumb and installation process even dumber. The former
should just run the compiler (as opposed to downloading and installing
semi-related stuff; this belongs elsewhere), and the latter should just copy
files. This way somebody could easily make a tarball or RPM/DEB package, which
allows for repeatable installations. Running sh&t from the internets doesn't
allow to reliably build packages and install software.
Don't assume that your users are idiots who cannot run two or three commands
in terminal.