Compile ROOT 6.10 error

My system is archlinux, gcc 7.1.1, cmake-3.6.1

when compile ROOT-6.10,
one error display:
Scanning dependencies of target G__Thread
make[2]: *** No rule to make target ‘/opt/root/include/TAtomicCount.h’, needed by ‘core/thread/G__Thread.cxx’. Stop.
make[1]: *** [CMakeFiles/Makefile2:13859: core/thread/CMakeFiles/G__Thread.dir/all] Error 2
make: *** [Makefile:150: all] Error 2

I guess you have an existing ROOT installation in /opt/root? Or is /opt/root your ‘build’ directory?

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