The firmware is cross-compiled, but the build system ends up using
'objcopy' instead of 'xtensa-elf-objcopy' by default.  Force it to
use the right one.

--- source/target_firmware/configure	2014-10-28 20:57:26.834436561 +0100
+++ source/target_firmware/configure	2014-10-28 20:57:29.666436530 +0100
@@ -11,6 +11,7 @@ mkdir -p build
 cat > "$TOOLCHAIN_FILE" <<EOF
 INCLUDE(CMakeForceCompiler)
 
+SET(CMAKE_OBJCOPY xtensa-elf-objcopy)
 SET(CMAKE_SYSTEM_PROCESSOR xtensa)
 SET(CMAKE_FIND_ROOT_PATH ${TOOLCHAIN}/$TARGET)
 SET(CMAKE_STRIP :)
td class='form'><form method='get'>
<input type='hidden' name='id' value='35ccd2f00651baa8dbbded640f6a9c9cf3588855'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=35ccd2f00651baa8dbbded640f6a9c9cf3588855'>refs</a><a class='active' href='/guix/log/tests/cran.scm'>log</a><a href='/guix/tree/tests/cran.scm?id=35ccd2f00651baa8dbbded640f6a9c9cf3588855'>tree</a><a href='/guix/commit/tests/cran.scm?id=35ccd2f00651baa8dbbded640f6a9c9cf3588855'>commit</a><a href='/guix/diff/tests/cran.scm?id=35ccd2f00651baa8dbbded640f6a9c9cf3588855'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/cran.scm'>
<input type='hidden' name='id' value='35ccd2f00651baa8dbbded640f6a9c9cf3588855'/><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=35ccd2f00651baa8dbbded640f6a9c9cf3588855'>root</a>/<a href='/guix/log/tests?id=35ccd2f00651baa8dbbded640f6a9c9cf3588855'>tests</a>/<a href='/guix/log/tests/cran.scm?id=35ccd2f00651baa8dbbded640f6a9c9cf3588855'>cran.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/tests/cran.scm?id=35ccd2f00651baa8dbbded640f6a9c9cf3588855&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-12-18 04:09:47 +0100'>2021-12-18</span></td><td><a href='/guix/commit/tests/cran.scm?id=10ceb3e84654e024f14a4b048e7d68492ed9dc7c'>import: cran: Fix description-&gt;package test.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-07-11 00:49:16 +0200'>2021-07-11</span></td><td><a href='/guix/commit/tests/cran.scm?id=aa6921634b4ea9988af0e37bfbb56780c431ef64'>import: cran: Emit new-style package inputs.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-16 23:14:05 +0100'>2020-01-16</span></td><td><a href='/guix/commit/tests/cran.scm?id=cfd1ed84013df85f0e473884ef4038b4bd7120d4'>import: cran: Avoid uses of '@@' in the tests.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>