Patch taken from the Sage packaging system.

--- src/include/Lcommon.h	2010-01-31 15:16:45.000000000 +0000
+++ src/include/Lcommon.h	2011-03-08 21:19:11.849443238 +0000
@@ -25,7 +25,7 @@
 #ifdef USE_MPFR
 inline double lcalc_to_double(const double& x) { return x; }
 #endif
-//inline double lcalc_to_double(const long double& x) { return x; }
+inline double lcalc_to_double(const long double& x) { return x; }
 inline double lcalc_to_double(const int& x) { return x; }
 inline double lcalc_to_double(const long long& x) { return x; }
 inline double lcalc_to_double(const short& x) { return x; }
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<tr><td><span title='2023-07-10 08:26:00 +0100'>2023-07-10</span></td><td><a href='/guix/commit/gnu/packages/rails.scm?id=219382c5701a4b43ff2518f71a5e8897dd55ab4f'>gnu: ruby-importmap-rails: Remove ruby-byebug dependency.</a><span class='msg-avail'>...<span class='msg-tooltip'>byebug is for Ruby 2, so it's good to move away from using it.

* gnu/packages/rails.scm (ruby-importmap-rails)[arguments]: Remove byebug from
Gemfile.
[native-inputs]: Remove ruby-byebug.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2023-07-10 08:26:00 +0100'>2023-07-10</span></td><td><a href='/guix/commit/gnu/packages/rails.scm?id=af583ce504e089d7a64172b573e38c78ae563d23'>gnu: ruby-railties: Fix build.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/rails.scm (ruby-railties)[arguments]: Skip a few more tests.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2023-07-10 08:26:00 +0100'>2023-07-10</span></td><td><a href='/guix/commit/gnu/packages/rails.scm?id=158b3dc693c8991caac85945f861f74f47274e71'>gnu: ruby-marcel: Fix build.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/rails.scm (ruby-marcel)[arguments]: Remove the byebug
dependency.
[native-inputs]: Remove ruby-byebug.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2023-07-10 08:26:00 +0100'>2023-07-10</span></td><td><a href='/guix/commit/gnu/packages/rails.scm?id=0ea78508fe2e03bc39b13cfb35289a02b819ff9c'>gnu: ruby-bootsnap: Fix build.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/rails.scm (ruby-bootsnap)[native-inputs]: Use ruby-mocha-1
rather than ruby-mocha.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2023-07-10 08:26:00 +0100'>2023-07-10</span></td><td><a href='/guix/commit/gnu/packages/rails.scm?id=f7b4258aedf33cf8469429dde929c5f961a78d11'>gnu: %ruby-rails-version: Update to 7.0.5.1.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/rails.scm (%ruby-rails-version): Update to 7.0.5.1.
(ruby-rails-monorepo): Update hash.
(ruby-activesupport)[propagated-inputs]: Switch to ruby-minitest-5.15 to
ruby-minitest.
(ruby-activerecord)[native-inputs]: Add ruby-mini-portile-2.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2023-07-10 08:25:55 +0100'>2023-07-10</span></td><td><a href='/guix/commit/gnu/packages/rails.scm?id=9dad3618cc1c97f37c9a33ae9fbf6de88efcce3a'>gnu: ruby-bindex: Update to 0.8.1 and rename to ruby-skiptrace.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/ruby.scm (ruby-bindex): Update to 0.8.1 and rename to
ruby-skiptrace.
[arguments]: Update style, remove git dependency and replace check phase.
[description,home-page]: Update for rename.
* gnu/packages/rails.scm (ruby-web-console)[propagated-inputs]: Replace
ruby-bindex with ruby-skiptrace.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2023-06-20 22:04:51 +0100'>2023-06-20</span></td><td><a href='/guix/commit/gnu/packages/rails.scm?id=7c5d30eb9f05c5b0b1e3032019148091c33a1513'>gnu: ruby-debug-inspector: Update to 1.1.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/rails.scm (ruby-debug-inspector): Update to 1.1.0.
[arguments]: Update style.
[native-inputs]: Add ruby-rake-compiler.
</span></span></td><td>Christopher Baines</td></tr>