It seems to be issue in Travis CI. See this forum post: https://travis-ci.community/t/cygwin-issue-cygheap-base-mismatch-detected/5359
If you are in hurry you can use Appveyor CI. I'm using it without any issue. One has to just add `C:\cygwin64\bin` in PATH variable in YAML file. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
