Taken from the Debian 2.8.0 package.

--- weex-2.6.1.5/src/strlib.c	2003-08-18 11:52:38.000000000 +0200
+++ weex-2.8.0/src/strlib.c	2007-12-04 14:22:02.000000000 +0100
@@ -42,6 +42,8 @@
 #  define G_VA_COPY(ap1, ap2)     (*(ap1) = *(ap2))
 #  elif defined (G_VA_COPY_AS_ARRAY)
 #  define G_VA_COPY(ap1, ap2)     g_memmove ((ap1), (ap2), sizeof (va_list))
+#  elif defined (__x86_64__)
+#  define G_VA_COPY(ap1, ap2)     memmove ((ap1), (ap2), sizeof (va_list))
 #  else /* va_list is a pointer */
 #  define G_VA_COPY(ap1, ap2)     ((ap1) = (ap2))
 #  endif /* va_list is a pointer */
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<tr><td><span title='2018-03-20 19:49:47 +0100'>2018-03-20</span></td><td><a href='/guix/commit/gnu/packages/lego.scm?id=324f192700b2b64631ced0d05576eeb1d2cf6918'>gnu: leocad: Use HTTPS home page.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/lego.scm (leocad)[home-page]: Use HTTPS.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-03-20 19:49:47 +0100'>2018-03-20</span></td><td><a href='/guix/commit/gnu/packages/lego.scm?id=84775d65a8aedcb8308c74d4ac7223f02d8fdd3e'>gnu: leocad: Update phase style.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/lego.scm (leocad)[arguments]: Substitute INVOKE for
SYSTEM* and end all phases with an explicit #t.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-03-20 19:49:46 +0100'>2018-03-20</span></td><td><a href='/guix/commit/gnu/packages/lego.scm?id=b5df3e266b8db0c2da9f70e317349c90dac30623'>gnu: leocad: Update to 18.02.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/lego.scm (leocad): Update to 18.02.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-08-03 00:33:02 -0500'>2017-08-03</span></td><td><a href='/guix/commit/gnu/packages/lego.scm?id=68a29ab8d00be37f5e084d16a8971d7cf5fb2714'>gnu: Add LeoCAD.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/lego.scm (leocad): New variable.
</span></span></td><td>Eric Bavier</td></tr>