Build with libtirpc on all architectures because glibc no longer provides
SunRPC support.

diff --git a/configure b/configure
--- a/configure
+++ b/configure
@@ -23635,10 +23635,13 @@
   *-pc-cygwin*)
     LIBS="$LIBS -ltirpc"
     CPPFLAGS="$CPPFLAGS -I/usr/include/tirpc"  ;;
+  *-linux-gnu)
+    LIBS="$LIBS -ltirpc"
+    CPPFLAGS="$CPPFLAGS"  ;;
   *) ;;
 esac
 
-if test "X$BUILD_XDR" != "Xyes"; then
+if test "X$BUILD_XDR" = "Xyes"; then
     cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -23693,9 +23696,9 @@
   ## but we need to make sure that it is present on the system. Do that here,
   ## The SunRPC of the glibc has been replaced by a TI-RPC (Transport Independent RPC) library for IPv6 support
   case "$host" in
-    *-pc-cygwin*)
+    *)
       HAVE_RPC="yes"
-      ac_fn_c_check_header_mongrel "$LINENO" "rpc.h" "ac_cv_header_rpc_h" "$ac_includes_default"
+      ac_fn_c_check_header_mongrel "$LINENO" "rpc/rpc.h" "ac_cv_header_rpc_h" "$ac_includes_default"
 if test "x$ac_cv_header_rpc_h" = xyes; then :
   :
 else
/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=c8c444dbd27303b330ff3d8217b5ce162232e815'>refs</a><a class='active' href='/guix/log/tests/syscalls.scm'>log</a><a href='/guix/tree/tests/syscalls.scm?id=c8c444dbd27303b330ff3d8217b5ce162232e815'>tree</a><a href='/guix/commit/tests/syscalls.scm?id=c8c444dbd27303b330ff3d8217b5ce162232e815'>commit</a><a href='/guix/diff/tests/syscalls.scm?id=c8c444dbd27303b330ff3d8217b5ce162232e815'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/syscalls.scm'>
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<div class='path'>path: <a href='/guix/log/?id=c8c444dbd27303b330ff3d8217b5ce162232e815'>root</a>/<a href='/guix/log/tests?id=c8c444dbd27303b330ff3d8217b5ce162232e815'>tests</a>/<a href='/guix/log/tests/syscalls.scm?id=c8c444dbd27303b330ff3d8217b5ce162232e815'>syscalls.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/syscalls.scm?id=c8c444dbd27303b330ff3d8217b5ce162232e815&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-10-26 12:46:27 +0200'>2021-10-26</span></td><td><a href='/guix/commit/tests/syscalls.scm?id=f87371bf3e952a211782311dad2971c8820a5150'>syscalls: Add 'openpty' and 'login-tty'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/build/syscalls.scm (openpty, login-pty): New procedures.
* tests/syscalls.scm ("openpty", "openpty + login-tty"): New tests.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-02-25 11:29:35 +0100'>2021-02-25</span></td><td><a href='/guix/commit/tests/syscalls.scm?id=7e9d9f28e997e7faad28cdd1c416be174d6986e7'>syscalls: Add 'mounts' and the &lt;mount&gt; record type.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/build/syscalls.scm (&lt;mount&gt;): New record type.
(option-string-&gt;mount-flags, mount-flags)
(octal-decode, mounts): New procedures.
(mount-points): Rewrite in terms of 'mount'.
* tests/syscalls.scm ("mounts"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-06-28 23:32:52 +0200'>2020-06-28</span></td><td><a href='/guix/commit/tests/syscalls.scm?id=5e113cf4424b2746cbf3633cd2106c62b89e5b49'>tests: Do not fail when network interface aliases are present.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/42111&gt;.

* tests/syscalls.scm ("network-interface-names"): Filter interface names with
a colon.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-06-05 19:20:23 +0200'>2020-06-05</span></td><td><a href='/guix/commit/tests/syscalls.scm?id=ea924134f819eef072ba7df9080d39de97fd73e6'>tests: syscall: Support file-systems without extended attributes.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/syscalls.scm (setxattr): Catch ENOTSUP that can be raised if the
file-system does not support extended user attributes.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-06-02 10:24:03 +0200'>2020-06-02</span></td><td><a href='/guix/commit/tests/syscalls.scm?id=cb21c14b0ae1f4c9fcad4927e3b2eb0c06d7b018'>tests: Allow passing on systems without support for swap devices.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/syscalls.scm ("swapon", "swapoff"): Accept ENOSYS as a valid result.

Signed-off-by: Mathieu Othacehe &lt;othacehe@gnu.org&gt;
</span></span></td><td>Simon South</td></tr>
<tr><td><span title='2020-05-14 00:48:12 +0200'>2020-05-14</span></td><td><a href='/guix/commit/tests/syscalls.scm?id=df05842332be80ed7f53022402b95cf711163b41'>syscalls: Add 'getxattr'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/build/syscalls.scm (getxattr): New procedure.
* tests/syscalls.scm ("getxattr, setxattr"): Test it, together with setxattr.
</span></span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2020-02-11 12:33:35 +0100'>2020-02-11</span></td><td><a href='/guix/commit/tests/syscalls.scm?id=1deca767be1b84b96633e317f3fcdd5165f95df3'>syscalls: Re-enable 'pivot-root' test.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/25476&gt;.
Reported by Paul Garlick &lt;pgarlick@tourbillion-technology.com&gt;.

* tests/syscalls.scm ("pivot-root"): Skip only when
PERFORM-CONTAINER-TESTS? is true.  Rewrite to use a socket pair instead
of a pipe.  Synchronize parent and child so that the parent can
initialize the child's UID and GID mappings before continuing.
</span></span></td><td>Ludovic Courtès</td></tr>