Hi, using the latest git (or the release version), I get a segfault: $/usr/bin/python3.3 -c 'import graph_tool.all as gt' ; tail -n 1 /var/log/messages Segmentation fault Jan 19 04:42:12 localhost kernel: [196711.282646] python3.3[18903]: segfault at 16ae16 ip 000000000016ae16 sp 00007ffff2286a18 error 14 in libgmp.so.10.1.3[7f05c5edb000+78000] The end of the backtrace says: Program received signal SIGSEGV, Segmentation fault. 0x00000000011ab766 in ?? () #0 0x00000000011ab766 in ?? () #1 0x00007fffc3ddc357 in PyInit_libgraph_tool_generation () at graph_generation.cc:99 #2 0x00007ffff7a50afc in _PyImport_LoadDynamicModule (name='graph_tool.generation.libgraph_tool_generation', path='/usr/lib64/python3.3/site-packages/graph_tool/generation/libgraph_tool_generation.so', fp=0x0) at /var/tmp/portage/dev-lang/python-3.3.5-r1/work/Python-3.3.5/Python/importdl.c:86 #3 0x00007ffff7a50564 in imp_load_dynamic (self=<module at remote 0x7ffff7f40b90>, args=('graph_tool.generation.libgraph_tool_generation', '/usr/lib64/python3.3/site-packages/graph_tool/generation/libgraph_tool_generation.so')) at /var/tmp/portage/dev-lang/python-3.3.5-r1/work/Python-3.3.5/Python/import.c:1801 #4 0x00007ffff7976f07 in PyCFunction_Call (func=<built-in method load_dynamic of module object at remote 0x7ffff7f40b90>, arg=('graph_tool.generation.libgraph_tool_generation', '/usr/lib64/python3.3/site-packages/graph_tool/generation/libgraph_tool_generation.so'), kw={}) at /var/tmp/portage/dev-lang/python-3.3.5-r1/work/Python-3.3.5/Objects/methodobject.c:81 Full backtraces and system information @ https://bugs.gentoo.org/show_bug.cgi?id=537042 line 99 of: https://github.com/count0/graph-tool/blob/master/src/graph/generation/graph_... seems to be the fault location Any idea on what I should try to further isloate this? using: gcc 4.8.3 boost-1.56.0-r1 gmp-5.1.3-r1 Thanks! -Justin