This fixes

../../../../gcc-7.4.0/libstdc++-v3/libsupc++/new_opa.cc: In function ‘void* __gnu_cxx::aligned_alloc(std::size_t, std::size_t)’:
../../../../gcc-7.4.0/libstdc++-v3/libsupc++/new_opa.cc:78:10: error: ‘memalign’ was not declared in this scope
   return memalign (al, sz);
          ^~~~~~~~
../../../../gcc-7.4.0/libstdc++-v3/libsupc++/new_opa.cc:78:10: note: suggested alternative: ‘max_align_t’
   return memalign (al, sz);
          ^~~~~~~~
          max_align_t

diff --git a/libstdc++-v3/libsupc++/new_opa.cc b/libstdc++-v3/libsupc++/new_opa.cc
index 94e79cadb0e..084900e0daf 100644
--- a/libstdc++-v3/libsupc++/new_opa.cc
+++ b/libstdc++-v3/libsupc++/new_opa.cc
@@ -39,6 +39,8 @@ extern "C" void *memalign(std::size_t boundary, std::size_t size);
 # endif
 #endif
 
+#define memalign _aligned_malloc
+
 using std::new_handler;
 using std::bad_alloc;
 
tch'/></form></td></tr>
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<div class='path'>path: <a href='/guix/log/?id=bf8e8a742836626135060818adbe76b2aa09714c'>root</a>/<a href='/guix/log/config-daemon.ac?id=bf8e8a742836626135060818adbe76b2aa09714c'>config-daemon.ac</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/config-daemon.ac?id=bf8e8a742836626135060818adbe76b2aa09714c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-03-05 10:41:18 +0100'>2018-03-05</span></td><td><a href='/guix/commit/config-daemon.ac?id=bdbece905538caf68817066126cb9b6b68ba9fd4'>build: Default to berlin.guixsd.org substitutes on aarch64.</a><span class='msg-avail'>...<span class='msg-tooltip'>Suggested by Efraim Flashner &lt;efraim@flashner.co.il&gt;.

* config-daemon.ac: Set 'guix_substitute_urls' to berlin.guixsd.org on
aarch64.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-03-05 10:41:18 +0100'>2018-03-05</span></td><td><a href='/guix/commit/config-daemon.ac?id=234d7ef567bd98ace98dd784472f19d2ee84f73d'>build: Always use https substitute URLs.</a><span class='msg-avail'>...<span class='msg-tooltip'>* config-daemon.ac: Remove GUILE_MODULE_AVAILABLE check for (gnutls).
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-02-27 00:45:59 +0100'>2018-02-27</span></td><td><a href='/guix/commit/config-daemon.ac?id=6f4c74620da01ead97507ead59b8b7a007fc5c5a'>build: Really build 'guix offload' when possible.</a><span class='msg-avail'>...<span class='msg-tooltip'>This fixes a regression introduced in
1d84d7bf6052c0c80bd212d4524876576e9817d4, whereby
HAVE_DAEMON_OFFLOAD_HOOK would never be defined.

* config-daemon.ac: Do not check for $ac_cv_guix_cbips_support_setvbuf,
which no longer exists.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-02-26 18:19:34 +0100'>2018-02-26</span></td><td><a href='/guix/commit/config-daemon.ac?id=1d84d7bf6052c0c80bd212d4524876576e9817d4'>build: Require Guile &gt;= 2.0.13.</a><span class='msg-avail'>...<span class='msg-tooltip'>* README, configure.ac, doc/guix.texi (Requirements): Increase minimum
Guile version from 2.0.9 to 2.0.13.
* config-daemon.ac: Remove use of 'GUIX_CHECK_UNBUFFERED_CBIP'.
* m4/guix.m4 (GUIX_CHECK_UNBUFFERED_CBIP): Remove.
* guix/build/download.scm (current-http-proxy): Remove.
* guix/build/syscalls.scm (%libc-errno-pointer, errno): Remove.
(syscall-&gt;procedure): Use #:return-errno unconditionally.
* guix/hash.scm (open-sha256-input-port)[unbuffered]: Remove outdated
comment.
* guix/http-client.scm (when-guile&lt;=2.0.5-or-otherwise-broken): Remove.
&lt;top level&gt;: Remove 'when-guile&lt;=2.0.5-or-otherwise-broken' block.
* guix/scripts/substitute.scm (fetch): Remove 'guile-version&gt;?'
conditional.
* tests/hash.scm (supports-unbuffered-cbip?): Remove.
&lt;top level&gt;: Remove 'test-skip' call.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-01-07 23:47:22 +0100'>2018-01-07</span></td><td><a href='/guix/commit/config-daemon.ac?id=f997137d0e2eba27bb1e2b282ee19ea474c41e12'>daemon: Make libbz2 an optional dependency.</a><span class='msg-avail'>...<span class='msg-tooltip'>* config-daemon.ac: Don't bail out when libbz2 is missing.  Define
'HAVE_LIBBZ2' Automake conditional.
* nix/libstore/build.cc: Wrap relevant bits in '#if HAVE_BZLIB_H'.
* nix/libstore/globals.cc (Settings::Settings): 'logCompression'
defaults to COMPRESSION_GZIP when HAVE_BZLIB_H is false.
* nix/libstore/globals.hh (CompressionType): Make 'COMPRESSION_BZIP2'
conditional on HAVE_BZLIB_H.
* nix/local.mk (guix_register_LDADD, guix_daemon_LDADD): Add -lbz2 only
when HAVE_LIBBZ2.
* nix/nix-daemon/guix-daemon.cc (parse_opt): Ignore "bzip2" when not
HAVE_BZLIB_H.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-01-07 23:47:22 +0100'>2018-01-07</span></td><td><a href='/guix/commit/config-daemon.ac?id=29a686688674dc875775305312513405fa396a06'>daemon: Add gzip log compression.</a><span class='msg-avail'>...<span class='msg-tooltip'>* nix/nix-daemon/guix-daemon.cc (GUIX_OPT_LOG_COMPRESSION): New macro.
(options): Mark "disable-log-compression" as hidden and add
"log-compression".
(parse_opt): Handle GUIX_OPT_LOG_COMPRESSION.
* nix/libstore/build.cc (DerivationGoal): Add 'gzLogFile'.
(openLogFile): Initialize it when 'logCompression' is COMPRESSION_GZIP.
(closeLogFile, handleChildOutput): Honor 'gzLogFile'.
* nix/libstore/globals.hh (Settings)[compressLog]: Remove.
[logCompression]: New field.
(CompressionType): New enum.
* nix/libstore/globals.cc (Settings::Settings): Initialize it.
(update): Remove '_get' call for 'compressLog'.
* nix/local.mk (guix_daemon_LDADD, guix_register_LDADD): Add -lz.
* guix/store.scm (log-file): Handle '.gz' log files.
* tests/guix-daemon.sh: Add test with '--log-compression=gzip'.
* doc/guix.texi (Invoking guix-daemon): Adjust accordingly.
* config-daemon.ac: Check for libz and zlib.h.
</span></span></td><td>Ludovic Courtès</td></tr>