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Determining if the include file pthread.h exists passed with the following output:
Change Dir: /var/tmp/portage/media-gfx/openvdb-7.1.0-r1/work/openvdb-7.1.0_build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/ninja cmTC_68677 && [1/2] Building CXX object CMakeFiles/cmTC_68677.dir/CheckIncludeFile.cxx.o
[2/2] Linking CXX executable cmTC_68677