My build command: python27 scons --wiredtiger --dbg=on -j 24 core The error: Checking for C library wpcap... no Checking if std::atomic<int64_t> works... no Checking for C library atomic... yes Checking if std::atomic<int64_t> works with libatomic... no The toolchain does not support std::atomic, cannot continue See /mnt/fast/sue/work/mongo/build/scons/config.log for details And the details from config.log: scons: Configure: Checking if std::atomic<int64_t> works with libatomic... build/scons/sconf_temp/conftest_53.cpp <- | |#include <atomic> | |int main() { | std::atomic<int64_t> x; | | x.store(0); | int64_t y = 1; | x.fetch_add(y); | x.fetch_sub(y); | x.exchange(y); | x.compare_exchange_strong(y, x); | return x.load(); |} | Compiling build/scons/sconf_temp/conftest_53.o In file included from /opt/mongodbtoolchain/v2/include/c++/5.3.0/x86_64-mongodb-linux/bits/os_defines.h:39:0, from /opt/mongodbtoolchain/v2/include/c++/5.3.0/x86_64-mongodb-linux/bits/c++config.h:482, from /opt/mongodbtoolchain/v2/include/c++/5.3.0/bits/atomic_base.h:35, from /opt/mongodbtoolchain/v2/include/c++/5.3.0/atomic:41, from build/scons/sconf_temp/conftest_53.cpp:2: /usr/include/features.h:330:4: error: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Werror=cpp] # warning _FORTIFY_SOURCE requires compiling with optimization (-O) ^ cc1plus: all warnings being treated as errors scons: Configure: no