Copied from Fedora.

https://bugzilla.redhat.com/show_bug.cgi?id=1189303
http://pkgs.fedoraproject.org/cgit/webkitgtk.git/commit/?id=e689e45d0cc2c50484e69d20371ba607af7326f3

diff -up webkitgtk-2.4.9/Source/WebCore/platform/sql/SQLiteStatement.cpp.sql_initialize_string webkitgtk-2.4.9/Source/WebCore/platform/sql/SQLiteStatement.cpp
--- webkitgtk-2.4.9/Source/WebCore/platform/sql/SQLiteStatement.cpp.sql_initialize_string	2015-09-14 09:25:43.004200172 +0200
+++ webkitgtk-2.4.9/Source/WebCore/platform/sql/SQLiteStatement.cpp	2015-09-14 09:25:57.852082368 +0200
@@ -71,7 +71,7 @@ int SQLiteStatement::prepare()
     // this lets SQLite avoid an extra string copy.
     size_t lengthIncludingNullCharacter = query.length() + 1;
 
-    const char* tail;
+    const char* tail = nullptr;
     int error = sqlite3_prepare_v2(m_database.sqlite3Handle(), query.data(), lengthIncludingNullCharacter, &m_statement, &tail);
 
     if (error != SQLITE_OK)
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<div class='path'>path: <a href='/guix/log/?id=4bd75d79e5ad8bb0f6cdcc0d15b9afb25f54afbd'>root</a>/<a href='/guix/log/gnu?id=4bd75d79e5ad8bb0f6cdcc0d15b9afb25f54afbd'>gnu</a>/<a href='/guix/log/gnu/installer?id=4bd75d79e5ad8bb0f6cdcc0d15b9afb25f54afbd'>installer</a>/<a href='/guix/log/gnu/installer/proxy.scm?id=4bd75d79e5ad8bb0f6cdcc0d15b9afb25f54afbd'>proxy.scm</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/gnu/installer/proxy.scm?id=4bd75d79e5ad8bb0f6cdcc0d15b9afb25f54afbd&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-11 21:37:07 +0100'>2020-12-11</span></td><td><a href='/guix/commit/gnu/installer/proxy.scm?id=8361817bf693742757b096468198626f297bb09e'>install: Discover local substitute servers.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/installer/substitutes.scm: New file.
* gnu/installer/newt/substitutes.scm: New file.
* gnu/local.mk (INSTALLER_MODULES): Add them.
* po/guix/POTFILES.in: Add gnu/installer/newt/substitutes.scm.
* gnu/installer/proxy.scm (with-silent-shepherd): Move to ...
* gnu/installer/utils.scm: ... here.
* gnu/installer/record.scm (&lt;installer&gt;)[substitutes-page]: New field.
* gnu/installer/newt.scm (substitutes-page): New procedure,
(newt-installer): register it.
* gnu/installer.scm (installer-steps): Add "substitutes-page" step.
* gnu/system/install.scm (%installation-services): Add avahi-service-type and
enable substitute server discover in guix-service-type.
[&lt;name-service-switch&gt;]: Set it to %mdns-host-lookup-nss.
</span></span></td><td>Mathieu Othacehe</td></tr>