Hello, First, I am maintaining the tango and pytango package in the Debian distribution. So during the gcc5 rebuilt I got affected by something strange, first in the tango library[1]. Then a problem with pytango[2] which depends on tango. you will find a interesting comment in [3]. And a small test program whcih shows the problem in [4]. So I would like your opinion about this pytango FTBFS. It seem that gcc5.2 generate different symbols in tango (abi-cxx11) than in pytango (no abi-cxx11). I do not understand why, so I am wondering if this is a bug in pytango, tango or in gcc. thanks for your help Frédéric [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=797285 [2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=797284#57 [3] https://lists.debian.org/debian-python/2015/09/msg00031.html [4] https://lists.debian.org/debian-python/2015/09/msg00032.html