Hi Julien, > This issue has been fixed as of rotd-2015-07-01. great! I just tested this ROTD and had no problem on 64Bit Debian, gcc 4.9.3 without any mmc in the PATH. btw. on the website[1], it says "borken" for mercury-srcdist-rotd-2015-06-22.tar.gz Best regards, Matthias Footnotes: [1] http://dl.mercurylang.org/index.html