Actually, i'm NOT exactly compiling a program, but an EXTENSION/ADD-ON to Rosegarden. It's called Rosegarden 'codicil', and it lets you use alternate tunings. Anyhow, i must admit the docs on how to compile it is VERY minimal. In fact, it's just 2 sentences!

"Compiling the Rosegarden Codicil

In addition to the standard package dependencies, the Rosegarden Codicil requires the
FFTW3 library and development package. Installation can be done by executing the
following commands:

./configure
make
make install (as root)."

Now, just what are 'standard package dependencies?" Could it be any more vague? I most likely need xorg-dev, since the error i'm getting has to do with X. But, i may also need KDE dev libraries (kdebase-dev, right?) I definitely need FFTW3-dev, as well. Didn't know about the '-s install <package.' switch for apt-get, that should be handy.