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 :)
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<tr><td><span title='2019-04-07 17:18:04 +0200'>2019-04-07</span></td><td><a href='/guix/commit/gnu/installer.scm?id=75988317b22efee2b2719e7d559fa9ff01a9db9a'>installer: Generalize desktop environments to system services.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-07 16:16:14 +0200'>2019-04-07</span></td><td><a href='/guix/commit/gnu/installer.scm?id=850ddf94e86a1711328e39872c7830ad6d5020b4'>installer: Move the 'locale' step before the 'welcome' step.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-27 11:54:05 +0100'>2019-03-27</span></td><td><a href='/guix/commit/gnu/installer.scm?id=50247be5f4633a4c3446cddbd3515d027853ec0d'>installer: Produce an 'initrd-modules' field if needed.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-25 23:37:05 +0100'>2019-03-25</span></td><td><a href='/guix/commit/gnu/installer.scm?id=3191b5f6ba5ebbb59a7448facd999ad7f7aeae79'>installer: Set the system's 'keyboard-layout' field.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-28 14:57:10 +0100'>2019-01-28</span></td><td><a href='/guix/commit/gnu/installer.scm?id=0791437f972caa7e48de91ad5cb150a614f617c2'>gnu: Move most packages from guile.scm to new module.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-01-17 14:04:26 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=5737ba841bd8e21e1cb5dc63e1fc5e09d31482bb'>installer: Various renamings.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:26 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=bf304dbceadf89c2722168be97d9673f94608aa6'>installer: partionment: Add encryption support.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:25 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=133c401f774d803f92933e9cadb6791641913beb'>installer: Display an eventual backtrace in a page.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:24 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=5bfdde503e0ce3b6518a247e01082848a23aa056'>installer: Reorder partitionment step.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:24 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=69a934f23ae1bd7dda9ec269a6ce3012e13c9011'>installer: Add partitioning support.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:23 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=6efd8430aeaa5b062a95202b9458435738ae2930'>installer: Fix comments.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:23 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=b4658c258eaf7731dbb45409aedef58afc5de93a'>installer: Add hostname.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:23 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=b51bde71a9385f4e81fbea258bfb9e8ff48be119'>installer: Add services page.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:23 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=c088b2e47f6675199f1ef545df7d04d4532e64e3'>installer: Do not ask for keyboard model.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:22 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=dc5f3275ecbddc804875899e9e457299a835d7ab'>installer: Add configuration formatter.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:21 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=6b48825e4ba6435c2e3bbc85857ade16552be9c3'>installer: Fix locale installation.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:21 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=a49d633c0c65975263270f5ac0050482ca6a5513'>installer: Move everything to the build side.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:20 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer.scm?id=d0f3a672dcbdfefd3556b6a21985ff0e35eed3be'>gnu: Add graphical installer support.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>