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='2020-10-08 15:57:30 +0200'>2020-10-08</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=6072182b3d9debaa126a6e4a3ac45eab9c28e20c'>gnu: chrony: Support Network Time Security (NTS).</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-10-08 15:57:30 +0200'>2020-10-08</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=f73e09b2c812eb0c348f7605b49ce6d19ec8bb4a'>gnu: chrony: Update to 4.0.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-09-13 15:46:02 -0400'>2020-09-13</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=898fbb60b2354e82e5b7f259b44dbfed112a83aa'>gnu: Fix a crash in NTP and Chrony.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2020-08-20 12:53:06 +0200'>2020-08-20</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=2ca5b4858f52d15599b4b477a40579603a1b39f7'>gnu: chrony: Update to 3.5.1 [fixes CVE-2020-14367].</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-07-11 22:59:54 +0200'>2020-07-11</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=bc332f07173a277cdad17b30021dad0299a858f3'>gnu: ntp: Update to 4.2.8p15 [security fixes].</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-04-08 17:05:51 +0200'>2020-04-08</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=198571b264547f800803e554c8f21a9c95be959c'>gnu: openntpd: Don't use NAME in source URI.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-04-08 14:42:29 +0200'>2020-04-08</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=9f12e06bb3c84c148a28491a480c7b8f55a3c131'>gnu: Add chrony.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-03-31 14:30:39 +0200'>2020-03-31</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=4b163550bda509c8e3c4c917d8e836cd876f9d72'>gnu: Order module imports in (gnu packages ntp).</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-03-07 16:04:20 +0100'>2020-03-07</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=db34ab735011b597d8e8cdfd40017b0957b128d8'>gnu: ntp: Update to 4.2.8p14 [fixes Sec 3610, Sec 3596, Sec 3592].</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-03-07 16:04:20 +0100'>2020-03-07</span></td><td><a href='/guix/commit/gnu/packages/ntp.scm?id=e4a9f135f7b06dd154059d8a170e92797187f0c4'>gnu: ntp: Use HTTPS in metadata URIs</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>