From 78f86d5f16c82ffbf5b877bf89093bc18699b146 Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Wed, 28 Nov 2018 22:23:09 -0500
Subject: [PATCH] silence compiler warning about singed vs. unsigned

---
 src/universe.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/universe.cpp b/src/universe.cpp
index 410d12dcb3..f078590103 100644
--- a/src/universe.cpp
+++ b/src/universe.cpp
@@ -174,9 +174,9 @@ void Universe::add_world(char *str)
 
     // str may not be empty and may only consist of digits or 'x'
 
-    int len = strlen(str);
+    size_t len = strlen(str);
     if (len < 1) valid = false;
-    for (int i=0; i < len; ++i)
+    for (size_t i=0; i < len; ++i)
       if (isdigit(str[i]) || str[i] == 'x') continue;
       else valid = false;