Based on https://anonscm.debian.org/viewvc/pkg-java/trunk/libxerces2-java/debian/patches/03_bootclasspath.patch?revision=14509, adopted for guix

--- xerces-2_11_0/build.xml.orig	2010-11-26 21:42:11.000000000 +0100
+++ xerces-2_11_0/build.xml	2017-03-28 14:04:41.946606996 +0200
@@ -290,13 +290,14 @@
            destdir="${build.dest}"
            source="${javac.source}"
            target="${javac.target}"
-           classpath="${build.dir}/classes:${tools.dir}/${jar.apis}:${tools.dir}/${jar.resolver}:${tools.dir}/${jar.serializer}"
+           classpath="${build.dir}/classes:${jar.jaxp}:${jar.apis-ext}:${jar.resolver}"
            debug="${debug}" nowarn="true"
            debuglevel="${debuglevel}"
            deprecation="${deprecation}"
            optimize="${optimize}"
            includeAntRuntime="false"
-           includeJavaRuntime="false"
+           includeJavaRuntime="true"
+           bootclasspath="${jar.jaxp}:${jar.apis-ext}:${jar.resolver}"
            excludes="org/xml/sax/** 
                 javax/xml/**
                 org/w3c/dom/*
@@ -1451,13 +1452,14 @@
                destdir="${build.dest}"
                source="${javac.source}"
                target="${javac.target}"
-               classpath="${build.dir}/classes:${tools.dir}/${jar.apis}:${tools.dir}/${jar.resolver}:${tools.dir}/${jar.serializer}"
+               classpath="${build.dir}/classes:${jar.jaxp}:${jar.apis-ext}:${jar.resolver}"
                debug="${debug}"
                debuglevel="${debuglevel}"
                deprecation="${deprecation}"
                optimize="${optimize}"
                includeAntRuntime="false"
-               includeJavaRuntime="false"
+               includeJavaRuntime="true"
+               bootclasspath="${jar.jaxp}:${jar.apis-ext}:${jar.resolver}"
                excludes="org/xml/sax/** 
                     javax/xml/**
                     org/w3c/dom/*
'q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=48d4df3c29a9b3d8806831cd3dea65fac92567ca'>root</a>/<a href='/guix/log/po?id=48d4df3c29a9b3d8806831cd3dea65fac92567ca'>po</a>/<a href='/guix/log/po/doc?id=48d4df3c29a9b3d8806831cd3dea65fac92567ca'>doc</a>/<a href='/guix/log/po/doc/guix-cookbook.fr.po?id=48d4df3c29a9b3d8806831cd3dea65fac92567ca'>guix-cookbook.fr.po</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/po/doc/guix-cookbook.fr.po?id=48d4df3c29a9b3d8806831cd3dea65fac92567ca&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-11-01 02:39:13 +0100'>2024-11-01</span></td><td><a href='/guix/commit/po/doc/guix-cookbook.fr.po?id=dd63cd7876f8c6a6eb42170219c17659ff4daf42'>nls: Update translations.</a><span class='msg-avail'>...<span class='msg-tooltip'>Change-Id: I15d674cd8e88250daa4284e8137a808c5298548f
</span></span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2024-09-04 17:34:49 +0200'>2024-09-04</span></td><td><a href='/guix/commit/po/doc/guix-cookbook.fr.po?id=95435c4ecefa1adc9e5c0d2e00daf4a55e7dea57'>nls: Update translations.</a><span class='msg-avail'>...<span class='msg-tooltip'>Change-Id: I069e1842da74b39124913fd2defbee6fa47eaa7e
</span></span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2024-09-02 00:46:31 +0200'>2024-09-02</span></td><td><a href='/guix/commit/po/doc/guix-cookbook.fr.po?id=dcc84e668d70558d7d48e340fe77a6cd5003e360'>nls: Update translations.</a><span class='msg-avail'>...<span class='msg-tooltip'>Change-Id: Icdee15b452c38ca885a8f202f68621916de01c03
</span></span></td><td>Florian Pelz</td></tr>