diff -ru a/include/stdio.h b/include/stdio.h
--- a/include/stdio.h	2000-08-04 10:24:39.000000000 +1000
+++ b/include/stdio.h	2005-06-18 14:26:35.000000000 +1000
@@ -34,6 +34,10 @@
 #include <bsd-games.h>
 #include_next <stdio.h>

+__BEGIN_DECLS
+
 #ifndef HAVE_fgetln
 extern char *fgetln(FILE *stream, size_t *len);
 #endif
+
+__END_DECLS
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<div class='path'>path: <a href='/guix/log/?id=34e193099c281d63a7508bf453bd16363e44ed6a'>root</a>/<a href='/guix/log/tests?id=34e193099c281d63a7508bf453bd16363e44ed6a'>tests</a>/<a href='/guix/log/tests/guix-download.sh?id=34e193099c281d63a7508bf453bd16363e44ed6a'>guix-download.sh</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/guix-download.sh?id=34e193099c281d63a7508bf453bd16363e44ed6a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
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<tr><td><span title='2021-11-27 00:49:53 +0100'>2021-11-27</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=1b1f557d888fa84b1bc818f1b221776355a7a2dd'>daemon: Print the line whence we expect an integer.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-11-25 00:17:21 +0100'>2021-11-25</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=1eb40a6dc4917f5a2e915f8b31b750dba3d378c6'>daemon: Read unsigned nar size and download size from substituter.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-04-09 17:46:38 +0200'>2021-04-09</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=2d73086262e1fb33cd0f0f16f74a495fe06b38aa'>daemon: 'guix substitute' replies on FD 4.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-12-08 22:30:08 +0100'>2020-12-08</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=a618a8c6203d4cf57f12873a86797b8685b11e14'>daemon: Factorize substituter agent spawning.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-12-08 22:30:08 +0100'>2020-12-08</span></td><td><a href='/guix/commit/nix/libstore/local-store.cc?id=79c6614f58a57b985daf8940766319e440311db0'>daemon: Use 'Agent' to spawn 'guix substitute --query'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>