AC_CACHE_CHECK([whether use of struct winsize requires sys/ptem.h],
jm_cv_sys_struct_winsize_needs_sys_ptem_h,
[jm_cv_sys_struct_winsize_needs_sys_ptem_h=yes
AC_CACHE_CHECK([whether use of struct winsize requires sys/ptem.h],
jm_cv_sys_struct_winsize_needs_sys_ptem_h,
[jm_cv_sys_struct_winsize_needs_sys_ptem_h=yes