Hello,
I have rebuilt the Openthread library with the prerelease (https://github.com/openthread/openthread/releases/tag/thread-reference-20180926) and I have some problem with my project compilation. I use this command :
make -f examples/Makefile-nrf52840 JOINER=1 COMMISSIONER=1 COAP=1 DNS_CLIENT=1 MTD_NETDIAG=1 MAC_FILTER=1 UDP_PROXY=1 SERVICE=1 DISABLE_SPI=1
Before, I've started with the thread_mtd_cop_client example and the project works fine with my new openthread library.
I start a new project from blank and I add all my file in the new project and now the compilation doesn't work... This is Segger output :

I think that the library libopenthread-nrf52840-sdk.a doesn' find the reference in the library libmbedcrypto.a but I don't know how change that...
Can someone help me to understand the problem please ?
Valentin