This patch is borrowed from Debian's patches for plink

Author: Peter Green <plugwash@p10link.net>
Puropose: Fallback to endian.h if all else fails on 64bit machines
Closes: #528659
Forwarded: Shaun Purcell <plink@chgr.mgh.harvard.edu>
License: same as plink itself.
===================================================================
--- plink-1.06.orig/Rsrv.h	2009-05-15 03:35:29.000000000 +0100
+++ plink-1.06/Rsrv.h	2009-05-15 03:35:41.000000000 +0100
@@ -313,7 +313,18 @@
 #define __BIG_ENDIAN__ 1
 #define SWAPEND 1
 #elif ! defined Win32 /* Windows is little-endian is most cases, anywhere else we're stuck */
-#error "Cannot determine endianness. Make sure config.h is included or __{BIG|LITTLE}_ENDIAN__ is defined ."
+  //try endian.h before we finally bail out
+  #include <endian.h>
+  #if __BYTE_ORDER == __LITTLE_ENDIAN
+    #warning using little endian based on information from endian.h
+    #define __LITTLE_ENDIAN__ 1
+  #elif __BYTE_ORDER == __BIG_ENDIAN
+    #warning using big endian based on information from endian.h
+    #define __BIG_ENDIAN__ 1
+    #define SWAPEND 1
+  #else    
+    #error "Cannot determine endianness. Make sure config.h is included or __{BIG|LITTLE}_ENDIAN__ is defined ."
+  #endif    
 #endif
 
 /* FIXME: all the mess below needs more efficient implementation - the current one is so messy to work around alignment problems on some platforms like Sun and HP 9000 */
f='/guix/diff/gnu/services/nix.scm?id=a4c738f40f0a164dbf41287f6ad946a10bb6409e'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/nix.scm'>
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<div class='path'>path: <a href='/guix/log/?id=a4c738f40f0a164dbf41287f6ad946a10bb6409e'>root</a>/<a href='/guix/log/gnu?id=a4c738f40f0a164dbf41287f6ad946a10bb6409e'>gnu</a>/<a href='/guix/log/gnu/services?id=a4c738f40f0a164dbf41287f6ad946a10bb6409e'>services</a>/<a href='/guix/log/gnu/services/nix.scm?id=a4c738f40f0a164dbf41287f6ad946a10bb6409e'>nix.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/services/nix.scm?id=a4c738f40f0a164dbf41287f6ad946a10bb6409e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-11-30 01:08:55 +0100'>2021-11-30</span></td><td><a href='/guix/commit/gnu/services/nix.scm?id=892f1b7273d57b25940700877a02618fe826cc08'>services: Accept &lt;inferior-package&gt;s in lieu of &lt;package&gt;s.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/authentication.scm (fprintd-configuration)
(nslcd-configuration): Substitute file-like objects for package ones.
* gnu/services/cgit.scm (cgit-configuration, opaque-cgit-configuration):
Likewise.
* gnu/services/cups.scm (package-list?, cups-configuration): Likewise.
* gnu/services/dns.scm (verify-knot-configuration)
(ddclient-configuration): Likewise.
* gnu/services/docker.scm (docker-configuration): Likewise.
* gnu/services/file-sharing.scm (transmission-daemon-configuration): Likewise.
* gnu/services/getmail.scm (getmail-configuration): Likewise.
* gnu/services/mail.scm (dovecot-configuration)
(opaque-dovecot-configuration): Likewise.
* gnu/services/messaging.scm (prosody-configuration)
(opaque-prosody-configuration): Likewise.
* gnu/services/monitoring.scm (zabbix-server-configuration)
(zabbix-agent-configuration): Likewise.
* gnu/services/networking.scm (opendht-configuration): Likewise.
* gnu/services/pm.scm (tlp-configuration): Likewise.
* gnu/services/telephony.scm (jami-configuration): Likewise.
* gnu/services/virtualization.scm (libvirt-configuration)
(qemu-guest-agent-configuration): Likewise.
* gnu/services/vpn.scm (openvpn-client-configuration): Likewise.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-04-26 20:03:55 +0300'>2021-04-26</span></td><td><a href='/guix/commit/gnu/services/nix.scm?id=43a7724040560d35e9e3a19bd1cfdb7e5c4c4711'>services: nix: Add /bin/sh to build-sandbox-paths.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/46297&gt;.

* gnu/services/nix.scm (nix-service-etc): Add /bin/sh to build-sandbox-paths.
</span></span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2020-12-06 17:48:48 +0800'>2020-12-06</span></td><td><a href='/guix/commit/gnu/services/nix.scm?id=8e73bf754f95fac5a383b90405e741d1cf1aaeb9'>services: nix: Move nix.conf generation to etc-service-type.</a><span class='msg-avail'>...<span class='msg-tooltip'>/etc/nix/nix.conf is a static file doesn't need rebuild on every boot.

* gnu/services/nix.scm (nix-activation): Don't create /etc/nix/nix.conf.
(nix-service-etc): New function.
(nix-service-type): New service-extension "nix-service-etc" to etc-service-type.

Signed-off-by: 宋文武 &lt;iyzsong@member.fsf.org&gt;
</span></span></td><td>Zhu Zihao</td></tr>