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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<tr><td><span title='2024-03-22 11:40:33 +0100'>2024-03-22</span></td><td><a href='/guix/commit/gnu/services.scm?id=29de2edfbbed21ac016f73a45d399795fc2e4dfb'>system, home: Validate ‘services’ field value.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-02-19 18:41:47 +0100'>2024-02-19</span></td><td><a href='/guix/commit/gnu/services.scm?id=e73db355b127b9ca2b5339f645f2d3eb6929531f'>services: activation: Ensure /var/run existence.</a><span class='msg-avail'>...</span></td><td>Nicolas Graves</td></tr>
<tr><td><span title='2023-12-02 12:25:45 +0100'>2023-12-02</span></td><td><a href='/guix/commit/gnu/services.scm?id=b0715d7cd2a74bc231751f8afc9dffb2047501ac'>gnu: Use ‘libc-utf8-locales-for-target’.</a><span class='msg-avail'>...</span></td><td>Janneke Nieuwenhuizen</td></tr>