A note for Debian maintainers:

The upstream source of HEALPix for Java is distributed in a monolithic
tarball that also includes the C, C++, Fortran, IDL, and Python language
variants. The debian/watch file for this package strips out the unrelated
source directories from the upstream tarball.

Due to the extreme simplicity of this package, I opted to use javahelper
instead of the upstream-provided build.xml Ant file.
