Index: databases/soci/files/patch-backends_mysql_session.cpp
===================================================================
--- /dev/null
+++ databases/soci/files/patch-backends_mysql_session.cpp
@@ -0,0 +1,14 @@
+Patch obtained from upstream 
+https://github.com/SOCI/soci/commit/165737c4be7d6c9acde92610b92e8f42a4cfe933
+
+--- backends/mysql/session.cpp.orig	2018-01-04 20:29:49 UTC
++++ backends/mysql/session.cpp
+@@ -199,7 +199,7 @@ void parse_connect_string(const string &
+                 throw soci_error(err);
+             }
+             *port = std::atoi(val.c_str());
+-            if (port < 0)
++            if (*port < 0)
+             {
+                 throw soci_error(err);
+             }