check_include_file (ucontext.h HAVE_UCONTEXT_H)
check_include_file (unistd.h HAVE_UNISTD_H)
check_include_file (unwind.h HAVE_UNWIND_H)
check_include_file (ucontext.h HAVE_UCONTEXT_H)
check_include_file (unistd.h HAVE_UNISTD_H)
check_include_file (unwind.h HAVE_UNWIND_H)