dnl header file, such as <unistd.h> or <stropts.h>, is needed for that.
AC_CACHE_CHECK([whether <sys/ioctl.h> declares ioctl],
[gl_cv_decl_ioctl_in_sys_ioctl_h],
dnl header file, such as <unistd.h> or <stropts.h>, is needed for that.
AC_CACHE_CHECK([whether <sys/ioctl.h> declares ioctl],
[gl_cv_decl_ioctl_in_sys_ioctl_h],