# AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of
# AC_CHECK_HEADERS(HEADER1 HEADER2 ...).
AC_DEFUN([AC_CHECK_HEADERS_ONCE], [
:
AC_FOREACH([gl_HEADER_NAME], [$1], [
# AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of
# AC_CHECK_HEADERS(HEADER1 HEADER2 ...).
AC_DEFUN([AC_CHECK_HEADERS_ONCE], [
:
AC_FOREACH([gl_HEADER_NAME], [$1], [