Python core dumps

I have noticed python REPL core dumps after importing certain libraries (core, site-dependent) followed by exit() or CTRL-D. I rebased and it still happens. Any thought? Just me? See versions and example below with import json. ~$ python -V Python 2.7.10 ~$ uname -a CYGWIN_NT-6.1-WOW X-0

difficulties building graphviz 2.20.2

Hello all, I wanted know of anyone else has tried to build graphviz 2.20.2 from source on cygwin. I am having trouble when it gets to vmalloc [cut] Making all in vmalloc make[3]: Entering directory `/home/Jean-Paul/graphviz-2.20.2/lib/vmalloc' mkdir -p ../../FEATURE ../../iffe - set cc gcc : ru