A preliminary cleanup for the Linux build. The GUI build still needs
clarification so others can successfully build on their systems (in
other words, these new directions aren't 100% full-proof yet).
Note: build-essential should not be needed:
"If you do not plan to build Debian packages, you don't need this
package. Starting with dpkg (>= 1.14.18) this package is required
for building Debian packages"
