Upstream C language source for J. R. Shewchuk's Triangle mesh generator with modifications. Used by Triangle_jll.jl which is at the core of Triangulate.jl.
See README for the original readme of the code.
Additions/modifications with respect to the upstram source found at netlib/voronoi:
unsigned long by ULONG to be flexible with this type. While in general, unsigned long is the right choice, on Windows (mingw32)
it needs to be unsigned long long. Similar issue here. The requirement is that ULONG can hold a pointer.