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='2020-12-06 21:34:57 -0500'>2020-12-06</span></td><td><a href='/guix/commit/gnu/packages/haskell-crypto.scm?id=4cb78021218fef3b45f16725873b54cf1206363f'>gnu: Add ghc-cryptonite-conduit.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/haskell-crypto.scm (ghc-cryptonite-conduit): New variable.

Signed-off-by: Timothy Sample &lt;samplet@ngyro.com&gt;
</span></span></td><td>Giacomo Leidi</td></tr>
<tr><td><span title='2020-08-13 16:44:56 +0200'>2020-08-13</span></td><td><a href='/guix/commit/gnu/packages/haskell-crypto.scm?id=b48e8c45ea341e5f8241c8fe9acb688f91547033'>gnu: ghc-cryptonite: Add "doc" output.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/haskell-crypto.scm (ghc-cryptonite)[outputs]: Add "doc" output
next to "out" and "static".
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2020-08-13 16:44:56 +0200'>2020-08-13</span></td><td><a href='/guix/commit/gnu/packages/haskell-crypto.scm?id=64041c6c2586852f6319bf695e5623e963737b71'>gnu: ghc-crypto-api-tests: Add "doc" output.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/haskell-crypto.scm (ghc-crypto-api-tests)[outputs]: Add "doc"
output next to "out" and "static".
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2020-08-13 16:44:52 +0200'>2020-08-13</span></td><td><a href='/guix/commit/gnu/packages/haskell-crypto.scm?id=54a5fd0791f15108d7c06f0b439e75e049fde249'>build-system/haskell: Add 'extra-directories' keyword.</a><span class='msg-avail'>...<span class='msg-tooltip'>See &lt;https://bugs.gnu.org/39309&gt;.

* guix/build-system/haskell.scm (lower): Include the transitive
propagated inputs of 'extra-directories' inputs.
(haskell-build): Add the 'extra-directories' keyword and pass it through
to the builder.
* guix/build/haskell-build-system.scm (configure): Use it to select
which inputs get passed via 'extra-include-dirs' and 'extra-lib-dirs' to
Cabal.
* gnu/packages/haskell-xyz.scm (ghc-alsa-core, ghc-hmatrix,
ghc-hmatrix-gsl, ghc-hslua, ghc-iwlib, ghc-libyaml, ghc-ncurses,
ghc-openglraw, ghc-x11, ghc-x11-xft, ghc-zlib): Set 'extra-directories'.
* gnu/packages/haskell-crypto.scm (ghc-digest, ghc-hsopenssl): Likewise.
</span></span></td><td>Timothy Sample</td></tr>