+ else
+ AC_CACHE_CHECK([for struct timespec in <unistd.h>],
+ [gl_cv_sys_struct_timespec_in_unistd_h],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <unistd.h>
+ ]],
+ [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
+ [gl_cv_sys_struct_timespec_in_unistd_h=yes],
+ [gl_cv_sys_struct_timespec_in_unistd_h=no])])
+ if test $gl_cv_sys_struct_timespec_in_unistd_h = yes; then
+ UNISTD_H_DEFINES_STRUCT_TIMESPEC=1
+ fi