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='2024-05-13 16:31:34 +0200'>2024-05-13</span></td><td><a href='/guix/commit/nix/libutil/util.cc?id=7757fdd491862fa5c33f1f894503346b89898a01'>daemon: Loop over ‘copy_file_range’ upon short writes.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-03-12 14:07:28 +0100'>2024-03-12</span></td><td><a href='/guix/commit/nix/libutil/util.cc?id=ff1251de0bc327ec478fc66a562430fbf35aef42'>daemon: Address shortcoming in previous security fix for CVE-2024-27297.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-03-11 22:12:34 +0100'>2024-03-11</span></td><td><a href='/guix/commit/nix/libutil/util.cc?id=8f4ffb3fae133bb21d7991e97c2f19a7108b1143'>daemon: Protect against FD escape when building fixed-output derivations (CVE...</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>