Don't unzip the sources which were bundled originally. Guix strips them from
the source and uses pre-build packages.

Taken from https://anonscm.debian.org/viewvc/pkg-java/trunk/libxerces2-java/debian/patches/02_build_dont_unzip.patch?revision=14507

Index: b/build.xml
===================================================================
--- a/build.xml
+++ b/build.xml
@@ -247,7 +247,7 @@
     <copy file="${src.dir}/org/apache/xerces/impl/xpath/regex/message.properties"
       tofile="${build.src}/org/apache/xerces/impl/xpath/regex/message_en.properties"/>
 
-    <!-- now deal with API's:  -->
+    <!-- not needed for Debian
     <unzip src="${src.apis.zip}" dest="${build.src}">
         <patternset
             includes="org/xml/sax/** 
@@ -270,6 +270,7 @@
                 org/w3c/dom/xpath/**"
         />
     </unzip>
+    -->
     
     <!-- substitute tokens as needed -->
     <replace file="${build.dir}/src/org/apache/xerces/impl/Version.java" 
@@ -1232,7 +1233,7 @@
     <replace file="${build.dir}/src/org/apache/xerces/parsers/AbstractSAXParser.java"
              token="return (fConfiguration instanceof XML11Configurable);" value="return false;"/>
  
-    <!-- now deal with API's:  -->
+    <!-- not needed for Debian
     <unzip src="${src.apis.zip}" dest="${build.src}">
         <patternset
             includes="org/xml/sax/** 
@@ -1255,7 +1256,7 @@
                 org/w3c/dom/xpath/**"
         />
     </unzip>
-
+    -->
 
     <!-- substitute tokens as needed -->
     <replace file="${build.dir}/src/org/apache/xerces/impl/Version.java" 
6.conf?id=6e27edda2c9987eeacf4782e6468f99dd1e58e63'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/aux-files/linux-libre/4.19-i686.conf'>
<input type='hidden' name='id' value='6e27edda2c9987eeacf4782e6468f99dd1e58e63'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
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<div class='path'>path: <a href='/guix/log/?id=6e27edda2c9987eeacf4782e6468f99dd1e58e63'>root</a>/<a href='/guix/log/gnu?id=6e27edda2c9987eeacf4782e6468f99dd1e58e63'>gnu</a>/<a href='/guix/log/gnu/packages?id=6e27edda2c9987eeacf4782e6468f99dd1e58e63'>packages</a>/<a href='/guix/log/gnu/packages/aux-files?id=6e27edda2c9987eeacf4782e6468f99dd1e58e63'>aux-files</a>/<a href='/guix/log/gnu/packages/aux-files/linux-libre?id=6e27edda2c9987eeacf4782e6468f99dd1e58e63'>linux-libre</a>/<a href='/guix/log/gnu/packages/aux-files/linux-libre/4.19-i686.conf?id=6e27edda2c9987eeacf4782e6468f99dd1e58e63'>4.19-i686.conf</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/packages/aux-files/linux-libre/4.19-i686.conf?id=6e27edda2c9987eeacf4782e6468f99dd1e58e63&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-01-15 14:31:21 +0100'>2020-01-15</span></td><td><a href='/guix/commit/gnu/packages/aux-files/linux-libre/4.19-i686.conf?id=2c97c980a0ca5f77464cd74207e29d835376f85b'>gnu: linux-libre: Include more framebuffer font sizes.</a><span class='msg-avail'>...<span class='msg-tooltip'>Add the 32x16 Terminus font for ‘high-DPI’ screens, and a 6x10 font that
allows for more (debugging) information to be displayed on standard-DPI
ones, while still being pleasant to read.

* gnu/packages/aux-files/linux-libre/4.14-arm.conf,
gnu/packages/aux-files/linux-libre/4.14-i686.conf,
gnu/packages/aux-files/linux-libre/4.14-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.19-arm.conf,
gnu/packages/aux-files/linux-libre/4.19-arm64.conf,
gnu/packages/aux-files/linux-libre/4.19-i686.conf,
gnu/packages/aux-files/linux-libre/4.19-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.4-i686.conf,
gnu/packages/aux-files/linux-libre/4.4-x86_64.conf,
gnu/packages/aux-files/linux-libre/4.9-i686.conf,
gnu/packages/aux-files/linux-libre/4.9-x86_64.conf,
gnu/packages/aux-files/linux-libre/5.4-arm-veyron.conf,
gnu/packages/aux-files/linux-libre/5.4-arm.conf,
gnu/packages/aux-files/linux-libre/5.4-arm64.conf,
gnu/packages/aux-files/linux-libre/5.4-i686.conf,
gnu/packages/aux-files/linux-libre/5.4-x86_64.conf:
Set CONFIG_FONTS=y, CONFIG_FONT_TER16x32=y, and CONFIG_FONT_6x10=y.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-09-18 19:04:59 +0800'>2019-09-18</span></td><td><a href='/guix/commit/gnu/packages/aux-files/linux-libre/4.19-i686.conf?id=62790449e61bfdf7835790fae89e49c210a08418'>gnu: linux-libre: Enable all nftables families.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/aux-files/linux-libre/4.19-arm.conf,
gnu/packages/aux-files/linux-libre/4.19-arm64.conf,
gnu/packages/aux-files/linux-libre/4.19-i686.conf,
gnu/packages/aux-files/linux-libre/4.19-x86_64.conf,
gnu/packages/aux-files/linux-libre/5.2-arm.conf,
gnu/packages/aux-files/linux-libre/5.2-arm64.conf,
gnu/packages/aux-files/linux-libre/5.2-i686.conf,
gnu/packages/aux-files/linux-libre/5.2-x86_64.conf: Set CONFIG_NF_TABLES_INET,
CONFIG_NF_TABLES_NETDEV, CONFIG_NF_TABLES_IPV4, CONFIG_NF_TABLES_IPV6 and
CONFIG_NF_TABLES_BRIDGE to 'y', and related options to 'm'.
</span></span></td><td>宋文武</td></tr>