#define _GNU_SOURCE
#cmakedefine HAVE_FDATASYNC
#cmakedefine HAVE_SYNC_FILE_RANGE
#cmakedefine HAVE_O_DIRECT
#cmakedefine HAVE_GCC_ATOMICS
#cmakedefine HAVE_PTHREAD_STACK_MIN
#cmakedefine HAVE_ALLOCA_H
#cmakedefine HAVE_TDESTROY
#cmakedefine HAVE_POWL

#ifndef HAVE_PTHREAD_STACK_MIN
#define PTHREAD_STACK_MIN 32768 // wild guess.
#endif