Without <limits.h>, INT_MAX is not defined.

diff --git a/transport.hxx b/transport.hxx
index 35a57a7..838add6 100644
--- a/transport.hxx
+++ b/transport.hxx
@@ -11,6 +11,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
+#include <limits.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
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<tr><td><span title='2013-05-12 16:35:17 +0200'>2013-05-12</span></td><td><a href='/guix/commit/ChangeLog?id=e793178adbd7d0d2202c0ab4bc6a9fec1df8851f'>build: Generate a ChangeLog file upon "make dist".</a><span class='msg-avail'>...<span class='msg-tooltip'>* Makefile.am (sync-synopses): New rule, formerly `dist-hook.
  (gen-ChangeLog): New rule.
  (dist-hook): Depend on these two targets.
</span></span></td><td>Ludovic Courtès</td></tr>