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='2019-07-27 23:58:49 +0200'>2019-07-27</span></td><td><a href='/guix/commit/gnu/packages/crypto.scm?id=b23579d0da9ccf7c6c5275480159b04b0ab7d482'>gnu: signify: Update to 26.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-07-02 20:57:33 +0200'>2019-07-02</span></td><td><a href='/guix/commit/gnu/packages/crypto.scm?id=1b7395b1adcce4c895240f1cfa245262c7e2ea9d'>gnu: tomb: Update to 2.6.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-06-03 22:28:48 +0200'>2019-06-03</span></td><td><a href='/guix/commit/gnu/packages/crypto.scm?id=3c75c66cf377df17336ef730c7700f4c84022704'>gnu: libsodium: Update to 1.0.18.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-05-22 18:08:08 -0700'>2019-05-22</span></td><td><a href='/guix/commit/gnu/packages/crypto.scm?id=f53044882529498518130a117f596b75371dda89'>gnu: scrypt: Fix typo "This package".</a><span class='msg-avail'>...</span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2019-05-01 22:15:01 +0200'>2019-05-01</span></td><td><a href='/guix/commit/gnu/packages/crypto.scm?id=15ada26abb2424d05d50a3b2f7d50f8eaba263b7'>gnu: signify: Update to 25.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-05-01 22:15:01 +0200'>2019-05-01</span></td><td><a href='/guix/commit/gnu/packages/crypto.scm?id=a5006ede7fe55f51e796e881d6b20d4922d49b17'>gnu: signify: Don't use unstable tarball.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-03-28 12:14:15 +0200'>2019-03-28</span></td><td><a href='/guix/commit/gnu/packages/crypto.scm?id=d5640c587f141ff60127848dc95528ca1a4f1b14'>gnu: googletest: Don't use unstable tarball.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2019-03-22 19:54:53 -0400'>2019-03-22</span></td><td><a href='/guix/commit/gnu/packages/crypto.scm?id=f2096f4aa8c6dd3894f91bd409ce282eb26c6111'>gnu: libb2: Update to 0.98.1.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2019-03-18 15:05:08 +0100'>2019-03-18</span></td><td><a href='/guix/commit/gnu/packages/crypto.scm?id=47956fa0c24efcdcba3493f0231c30e9a39ec7df'>Correct name and email address for ng0.</a><span class='msg-avail'>...</span></td><td>ng0</td></tr>
<tr><td><span title='2019-02-26 00:02:00 -0500'>2019-02-26</span></td><td><a href='/guix/commit/gnu/packages/crypto.scm?id=cc6731e928f8da86ebf13f4402e03f880ec87302'>gnu: Add hpenc.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2019-02-17 18:44:18 +0100'>2019-02-17</span></td><td><a href='/guix/commit/gnu/packages/crypto.scm?id=1cb0c7a32c33cf575bdfa37536213ad0751f1b40'>gnu: keyutils: Update to 1.6.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-02-17 18:44:18 +0100'>2019-02-17</span></td><td><a href='/guix/commit/gnu/packages/crypto.scm?id=61506fe551ed2237754dcaef569fff4645cd1a9d'>gnu: Remove unneeded uses of python{,2}-minimal.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>