Hi Romain, Am Sat, 02 Jul 2016 16:32:29 +0200 schrieb Romain Naour: > Since Boost 1.61.0 boost-local require a toolchain with NTPL threads > support. NAK, the Cortex m4 toolchain is broken, not boost: http://lists.busybox.net/pipermail/buildroot/2016-June/163865.html Regards, Bernd