ROMAN_HUNDREDS, ROMAN_TENS and ROMAN_ONES seem to use syntax, that is not
recognized (any longer?) by flex, so let's expand their definitions.

Index: spl-1.2.1/include/roman_numbers.metaflex
===================================================================
--- spl-1.2.1.orig/include/roman_numbers.metaflex
+++ spl-1.2.1/include/roman_numbers.metaflex
@@ -1,5 +1,5 @@
 ROMAN_THOUSANDS m+
-ROMAN_HUNDREDS  (c(d|m)|dc{0,3}|c{1,3})
-ROMAN_TENS      (x(l|c)|lx{0,3}|x{1,3})
-ROMAN_ONES      (i(v|x)|vi{0,3}|i{1,3})
+ROMAN_HUNDREDS  (c(d|m|c?c?)|dc?c?c?)
+ROMAN_TENS      (x(l|c|x?x?)|lx?x?x?)
+ROMAN_ONES      (i(v|x|i?i?)|vi?i?i?)
 ROMAN_NUMBER    {ROMAN_ONES}|{ROMAN_TENS}{ROMAN_ONES}?|{ROMAN_HUNDREDS}{ROMAN_TENS}?{ROMAN_ONES}?|{ROMAN_THOUSANDS}{ROMAN_HUNDREDS}?{ROMAN_TENS}?{ROMAN_ONES}?
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<tr><td><span title='2022-10-07 15:08:05 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/tests/vnc.scm?id=0169aee33e154c1fa8b299c7f126f3e94a8dc9a4'>tests: xvnc: Do not use specification-&gt;package in OS definition.</a><span class='msg-avail'>...<span class='msg-tooltip'>Doing so would cause the extra package dependencies to not be
correctly registered as dependencies, which would lead to a silent
failure when attempting to load or byte compile the module at the time
guix build itself (e.g., when running 'guix pull').

* gnu/tests/vnc.scm (%xvnc-os) [packages]: Turn the the
specification-&gt;package declaration into a list of package objects.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-10-07 15:07:48 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/tests/vnc.scm?id=00e843050012961e9cc41b003ea9271eab718541'>Revert "Revert "services: Add xvnc-service-type.""</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit 0c4966160054bc50e6ab3a4ac9c9a6a1826ab5a0.  The fix appears
in the subsequent commit, for clarity.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-10-07 12:53:22 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/tests/vnc.scm?id=0c4966160054bc50e6ab3a4ac9c9a6a1826ab5a0'>Revert "services: Add xvnc-service-type."</a><span class='msg-avail'>...<span class='msg-tooltip'>This reverts commit 1c528a95cb92b7808e6603d7956185005583629f.  This broke
'guix pull', for (yet) unknown reasons.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-10-07 10:11:13 -0400'>2022-10-07</span></td><td><a href='/guix/commit/gnu/tests/vnc.scm?id=1c528a95cb92b7808e6603d7956185005583629f'>services: Add xvnc-service-type.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/vnc.scm: New file.
* gnu/tests/vnc.scm: Likewise.
* gnu/local.mk: Register them.
</span></span></td><td>Maxim Cournoyer</td></tr>