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" 
s/inkscape.scm'>
<input type='hidden' name='id' value='03592a6f882f5b4309f77c3dc3e65559d7b7cb75'/><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=03592a6f882f5b4309f77c3dc3e65559d7b7cb75'>root</a>/<a href='/guix/log/gnu?id=03592a6f882f5b4309f77c3dc3e65559d7b7cb75'>gnu</a>/<a href='/guix/log/gnu/packages?id=03592a6f882f5b4309f77c3dc3e65559d7b7cb75'>packages</a>/<a href='/guix/log/gnu/packages/inkscape.scm?id=03592a6f882f5b4309f77c3dc3e65559d7b7cb75'>inkscape.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/packages/inkscape.scm?id=03592a6f882f5b4309f77c3dc3e65559d7b7cb75&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-05-15 14:30:23 +0200'>2018-05-15</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=20f5c86c3e3226b04eaf2f7d29a1a0200f323033'>gnu: inkscape: Disable "icon-theme.cache" generation.</a><span class='msg-avail'>...</span></td><td>Danny Milosavljevic</td></tr>
<tr><td><span title='2018-03-17 05:06:32 +0530'>2018-03-17</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=68376f6c88865066ffa196937b4c41076d6e1044'>gnu: inkscape: Build with potrace support.</a><span class='msg-avail'>...</span></td><td>Arun Isaac</td></tr>
<tr><td><span title='2018-03-14 07:47:31 +0100'>2018-03-14</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=d773fef1ce2d6f6386c8d388ce2b63ed9a264843'>gnu: inkscape: Update to 0.92.3.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-03-04 15:44:34 +0100'>2018-03-04</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=81ed306dee3b1049041edaa4b7beab8ef2743aea'>gnu: inkscape: Disable duplicate icon cache generation.</a><span class='msg-avail'>...</span></td><td>Danny Milosavljevic</td></tr>
<tr><td><span title='2018-01-11 03:16:01 +0100'>2018-01-11</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=50dc3b8b2fc1d9c9c083c295d4f66ecd0d15b3b8'>gnu: inkscape: Use HTTPS for home page.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-01-11 03:16:01 +0100'>2018-01-11</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=2b7eda61cbf92145e647954d2b4897358811144b'>gnu: inkscape: Update to 0.92.2.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-10-05 22:32:23 +0200'>2017-10-05</span></td><td><a href='/guix/commit/gnu/packages/inkscape.scm?id=c4787c78311c40aab8d8e25352f6190ca0177130'>gnu: inkscape: Fix FTBFS with Poppler &gt;= 0.58.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>