GLIBC_2.21 __errno_location F
GLIBC_2.21 pthread_create F
GLIBC_2.21 pthread_setschedprio F
GLIBC_2.21 pthread_sigqueue F
GLIBC_2.28 thrd_create F
GLIBC_2.30 __libpthread_version_placeholder F
GLIBC_2.31 __libpthread_version_placeholder F