I fixed this by downloading the latest source version (at time of writing, 3.1.0) from https://www.joedog.org/siege-home/ and installing it using the instructions in the INSTALL file.
-- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to siege in Ubuntu. https://bugs.launchpad.net/bugs/1317812 Title: libgcc_s.so.1 must be installed for pthread_cancel to work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/siege/+bug/1317812/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs