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='2017-09-04 20:39:20 -0400'>2017-09-04</span></td><td><a href='/guix/commit/gnu/packages/libidn.scm?id=b8b0f536a4f9a26c1d4002ca54048db6d5e58760'>gnu: libidn2: Replace with 2.0.4 [security fixes].</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2017-05-22 20:42:50 +0200'>2017-05-22</span></td><td><a href='/guix/commit/gnu/packages/libidn.scm?id=9b5fccbc48ab9acaa24d727a93d09f3e1f41de09'>gnu: libidn2: Update to 2.0.2.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-04-23 19:12:42 +0300'>2017-04-23</span></td><td><a href='/guix/commit/gnu/packages/libidn.scm?id=f98adb1cb3315a68b7f6c741fa3d647c305db369'>gnu: libidn2: Update to 2.0.1.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2017-03-30 22:59:53 +0200'>2017-03-30</span></td><td><a href='/guix/commit/gnu/packages/libidn.scm?id=84157bb8bf2c610584e0836047da4c710f8eaf76'>Merge branch 'master' into core-updates</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-03-30 01:30:16 +0200'>2017-03-30</span></td><td><a href='/guix/commit/gnu/packages/libidn.scm?id=6fd52309b8f52c9bb59fccffac53e029ce94b698'>gnu: Use HTTPS for almost all gnu.org HOME-PAGEs.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-03-14 21:29:27 +0100'>2017-03-14</span></td><td><a href='/guix/commit/gnu/packages/libidn.scm?id=77c5d63f4d76f2905d975316347948cc913c6d20'>gnu: libidn2: Create 'pkg-config' file.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-02-06 02:33:31 +0100'>2017-02-06</span></td><td><a href='/guix/commit/gnu/packages/libidn.scm?id=0418ff7a37c02b314eda67db177565db24ca34f4'>gnu: libidn2: Update to 0.16.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2016-11-06 03:29:06 -0500'>2016-11-06</span></td><td><a href='/guix/commit/gnu/packages/libidn.scm?id=8b6ad165d1fa479e5da2938d099dba356186e07c'>Merge branch 'master' into core-updates</a></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2016-11-05 01:12:35 -0400'>2016-11-05</span></td><td><a href='/guix/commit/gnu/packages/libidn.scm?id=c2f4cab9a062bdd01af48584424f38ccebb7c29d'>gnu: libidn: Distinguish from libidn2.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2016-11-05 01:12:31 -0400'>2016-11-05</span></td><td><a href='/guix/commit/gnu/packages/libidn.scm?id=250a8abc6634291334029b689b89058ba33b0ec4'>gnu: Add libidn2.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2016-09-02 09:52:56 -0400'>2016-09-02</span></td><td><a href='/guix/commit/gnu/packages/libidn.scm?id=d058708e86dab50579d3147e3ee2c6fcc03e63c9'>gnu: libidn: Replace with 1.33 [fixes CVE-2015-8948 and CVE-2016-{6261,6263}].</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2016-08-14 15:26:10 -0400'>2016-08-14</span></td><td><a href='/guix/commit/gnu/packages/libidn.scm?id=4f81d52720590d0df5e607086f13c9251d6812d4'>gnu: libidn: Update to 1.33.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>