Hello, fellow applied mathematicians and computer scientists, hello also to all the brave physicists who use the [arXiv](http://www.arxiv.org/). Did you know that you can [publish source code and other ancillary files on the arXiv](http://arxiv.org/help/ancillary_files), along with your preprint? If you didn't, this must be great news for you. However, if you ever tried to actually do this, you *might* have been just as confused as me. It's actually quite likely that you were, because as soon as this blogpost has vanished from the front page, I am pretty sure that a google search is what led you here. > Ancillary files are included with an arXiv submission by placing them in a directory anc at the root of the submission package. If you are a novice to uploading files to the arXiv, like me, this might be confusing. What is the *submission package*? I only ever submitted a single $\KaTeX$ file! Well, let me put it straight for you. - In the directory with your .tex file(s), make a directory called anc. - Place all your source code and stuff in that directory. - Make a zip file containing all your LaTeX sources and the folder anc. - Upload that zip file to the arXiv. Trust me - everything will be fine.

Under Cygwin, you can install the 64 bit mingw version of GCC, but you don't get the gnu multiprecision library for free with it, you'll much rather have to compile it from source. I ran into a bit of trouble here: It will not suffice to tell the configuration script about the new compiler, there are now mingw-64 versions of all relevant binaries that should be used instead. Basically, you go like
tar -xjf gmp-5.0.4.tar.bz2
cd gmp-5.0.4
./configure                          \
  AR=x86_64-w64-mingw32-ar           \
  AS=x86_64-w64-mingw32-as           \
  DLLTOOL=x86_64-w64-mingw32-dlltool \
  DLLWRAP=x86_64-w64-mingw32-dllwrap \
  CC=x86_64-w64-mingw32-gcc-4.5.3    \
  NM=x86_64-w64-mingw32-nm           \
  LD=x86_64-w64-mingw32-ld           \
  OBJDUMP=x86_64-w64-mingw32-objdump \
  RANLIB=x86_64-w64-mingw32-ranlib   \
I am not sure if all of these are needed, but it won't hurt either. After that, you should
make && make check
the whole thing. Worked perfectly for me, so now I can link with libgmp.a in .libs and native 64 bit bignum action ensues!