Hi the trace is below. I am running Python 2.7.3 and Boost 1.49. Yes it looks to same problem indeed. Padraig $ gdb python GNU gdb (GDB) 7.5-ubuntu Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /usr/bin/python...(no debugging symbols found)...done. (gdb) run test.py Starting program: /usr/bin/python test.py [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. 0x00000000004b5d5a in ?? () (gdb) bt #0 0x00000000004b5d5a in ?? () #1 0x00000000004ef748 in ?? () #2 0x000000000048a57e in ?? () #3 0x00007ffff6f1f901 in ?? () from /lib/x86_64-linux-gnu/libc.so.6 #4 0x00007ffff6f1f985 in exit () from /lib/x86_64-linux-gnu/libc.so.6 #5 0x00007ffff6f05774 in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6 #6 0x00000000004ce0ad in _start () -- View this message in context: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/... Sent from the Main discussion list for the graph-tool project mailing list archive at Nabble.com.