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" 
patches/xplanet-1.3.1-libimage_gif.c.patch?id=d7942ac12ad51615cd43d3debb8b561a503e8fc0'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/patches/xplanet-1.3.1-libimage_gif.c.patch'>
<input type='hidden' name='id' value='d7942ac12ad51615cd43d3debb8b561a503e8fc0'/><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>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=d7942ac12ad51615cd43d3debb8b561a503e8fc0'>root</a>/<a href='/guix/log/gnu?id=d7942ac12ad51615cd43d3debb8b561a503e8fc0'>gnu</a>/<a href='/guix/log/gnu/packages?id=d7942ac12ad51615cd43d3debb8b561a503e8fc0'>packages</a>/<a href='/guix/log/gnu/packages/patches?id=d7942ac12ad51615cd43d3debb8b561a503e8fc0'>patches</a>/<a href='/guix/log/gnu/packages/patches/xplanet-1.3.1-libimage_gif.c.patch?id=d7942ac12ad51615cd43d3debb8b561a503e8fc0'>xplanet-1.3.1-libimage_gif.c.patch</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/patches/xplanet-1.3.1-libimage_gif.c.patch?id=d7942ac12ad51615cd43d3debb8b561a503e8fc0&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-04-04 23:17:55 -0500'>2020-04-04</span></td><td><a href='/guix/commit/gnu/packages/patches/xplanet-1.3.1-libimage_gif.c.patch?id=77704cb13e5bebf412297dab764a00849a3cfdc0'>gnu: Add xplanet.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/xplanet-1.3.1-cxx11-eof.patch,
gnu/packages/patches/xplanet-1.3.1-libdisplay_DisplayOutput.cpp.patch,
gnu/packages/patches/xplanet-1.3.1-libimage_gif.c.patch,
gnu/packages/patches/xplanet-1.3.1-xpUtil-Add2017LeapSecond.cpp.patch: New
files.
* gnu/packages/astronomy.scm (xplanet): New variable.
[source]: Use patches.
* gnu/local.mk (dist_patch_DATA): Add them.

Signed-off-by: Eric Bavier &lt;bavier@member.fsf.org&gt;
</span></span></td><td>R Veera Kumar</td></tr>