other port changes:
- use math/fftw3 library
- fix MASTER_SITES
- add a few patches to include correct headers
- build all HTML documentation and adjust BUILD_DEPENDS accordingly
From: maintainer Steven Mestdagh
GNU Octave is a high-level language, primarily intended for numerical
computations. It provides a convenient command line interface for
solving linear and nonlinear problems numerically, and for performing
other numerical experiments using a language that is mostly compatible
with Matlab. It may also be used as a batch-oriented language.