# older flex versions don't support is (see automake bug#11524 and
# bug#12836). Skip this test if such an old flex version is detected.
$LEX --help | grep '.*--header-file' \
# older flex versions don't support is (see automake bug#11524 and
# bug#12836). Skip this test if such an old flex version is detected.
$LEX --help | grep '.*--header-file' \