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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<div class='path'>path: <a href='/guix/log/?id=5f5782311ed0304beed413c10a2eb404d6344205'>root</a>/<a href='/guix/log/doc?id=5f5782311ed0304beed413c10a2eb404d6344205'>doc</a>/<a href='/guix/log/doc/local.mk?id=5f5782311ed0304beed413c10a2eb404d6344205'>local.mk</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/doc/local.mk?id=5f5782311ed0304beed413c10a2eb404d6344205&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-11-01 12:36:47 +0100'>2018-11-01</span></td><td><a href='/guix/commit/doc/local.mk?id=1e40e70bfebba47ccea354ddf862276d2c4223ea'>doc: Add German translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/contributing.de.texi: New file.
* doc/guix.de.texi: New file
* doc/local.mk (TRANSLATED_INFO): Add them.
(info_TEXINFOS): Add guix.de.texi.
* po/doc/guix-manual.de.po: New file.
* po/doc/local.mk (EXTRA_DIST): Add it.
* doc/guix.texi: Document the German translation.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-04-29 21:42:14 +0200'>2018-04-29</span></td><td><a href='/guix/commit/doc/local.mk?id=39764ef893b7b65a8ce55e13746fed8fd0bad6e0'>build: Use only one domain for guix-manual.</a><span class='msg-avail'>...<span class='msg-tooltip'>* Makefile.am (assert-no-store-file-names): Exclude guix-manual.
* po/doc/guix.pot po/doc/contributing.pot: Merge into...
* po/doc/guix-manual.pot: ...this.
* po/doc/guix.fr.po po/doc/contributing.fr.po: Merge into...
* po/doc/guix-manual.fr.po: ...this.
* doc/local.mk: Replace old file names.
* po/doc/local.mk: Replace old file names.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-04-25 23:11:53 +0200'>2018-04-25</span></td><td><a href='/guix/commit/doc/local.mk?id=06c4778ae290c9f8de5f8ef1683cec14de8f2ebc'>build: Add silent rules for Texinfo xref translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* Makefile.am (AM_V_POXREF, AM_V_POXREF_, AM_V_POXREF_0): New
variables.
* doc/local.mk ($(srcdir)/%D%/guix.%.texi)
($(srcdir)/%D%/contributing.%.texi): Use $(AM_V_POXREF).
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-04-19 21:32:07 +0200'>2018-04-19</span></td><td><a href='/guix/commit/doc/local.mk?id=bf5c74e713c623cbb0001eb36af6998e92243482'>gnu: doc: Add French documentation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/contributing.fr.texi: New file.
* doc/guix.fr.texi: New file.
* doc/local.mk (TRANSLATED_INFO): Add them.
(info_TEXINFOS): Add guix.fr.texi.
* po/doc/contributing.fr.po: New file.
* po/doc/guix.fr.po: New file.
* po/doc/local.mk (EXTRA_DIST): Add them.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-04-19 21:30:30 +0200'>2018-04-19</span></td><td><a href='/guix/commit/doc/local.mk?id=b9fe8fd662180e64156d2b95a671242c20f0acfc'>gnu: doc: Allow documentation to be translated.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/doc/contributing.pot: New file.
* po/doc/guix.pot: New file.
* po/doc/local.mk: New file.
* Makefile.am: Include it. Add gettext command. Add silent rules for po4a.
* configure.ac: Look for po4a-translate and po4a-updatepo.
* doc/local.mk: Add rules to generate translated texi files.
(TRANSLATED_INFO): New variable.
(BUILT_SOURCES, EXTRA_DIST, MAINTAINERCLEANFILES): Add it.
* .gitignore: Add generated files.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-01-20 00:45:29 +0100'>2018-01-20</span></td><td><a href='/guix/commit/doc/local.mk?id=523790d11d4d4d786e7b2ad19d3333e9fffb016d'>build: Declare “doc/guix.texi“ dependencies.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/29727&gt;.

* doc/local.mk (%C%_guix_TEXINFOS): New variable containing files included by
“doc/guix.texi”.
(EXTRA_DIST): Remove ‘.texi’ files.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Mathieu Lirzin</td></tr>
<tr><td><span title='2017-01-12 14:59:36 +0100'>2017-01-12</span></td><td><a href='/guix/commit/doc/local.mk?id=409c5733224f714096d0e2a665b85d64c96c7088'>build: Remove reference to 'doc/emacs.texi'.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to deb6276dda81a69da38e842d269c5370a28fa5cf.

* doc/local.mk (EXTRA_DIST): Remove 'emacs.texi'.
</span></span></td><td>Ludovic Courtès</td></tr>