AUTOCONF_VERSION=2.69 AUTOMAKE_VERSION=1.15 aclocal
AUTOCONF_VERSION=2.69 AUTOMAKE_VERSION=1.15 autoconf
AUTOCONF_VERSION=2.69 AUTOMAKE_VERSION=1.15 automake -a
CXX=/usr/ports/pobj/gcc-4.9.3/bin/eg++ ./configure
make

terminate called after throwing an instance of 'std::system_error'
what():  Enable multithreading to use std::thread: Operation not permitted
Abort trap (core dumped)

GNU gdb 6.3
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "amd64-unknown-openbsd6.0".
Core was generated by `ansvif'.
Program terminated with signal 6, Aborted.
#0  0x00000a5d2326029a in ?? ()
(gdb) bt
#0  0x00000a5d2326029a in ?? ()
#1  0x00000a5d23274039 in ?? ()
#2  0x00000a5d23280c0a in ?? ()
#3  0x00000a5a441cea80 in ?? ()
#4  0xffffffdf00000202 in ?? ()
#5  0xf296d56c8d2c4acf in ?? ()
#6  0x00000a5c54dc0198 in ?? ()
#7  0x00000a5a43d8b165 in ?? ()
#8  0x0000000000000000 in ?? ()