Index: src/gengine/OptionAgent.cpp
===================================================================
--- src/gengine/OptionAgent.cpp.orig
+++ src/gengine/OptionAgent.cpp
@@ -25,6 +25,7 @@
 
 #include <string.h> //strlen
 #include <locale.h> //setlocale
+#include <cstdlib>  //getenv
 
 #ifndef LC_MESSAGES
 #define LC_MESSAGES LC_CTYPE
Index: src/gengine/StringTool.cpp
===================================================================
--- src/gengine/StringTool.cpp.orig
+++ src/gengine/StringTool.cpp
@@ -7,7 +7,7 @@
  * (at your option) any later version.
  */
 #include "StringTool.h"
-
+#include <stdlib.h>
 #include <sstream>
 
 //-----------------------------------------------------------------
Index: src/level/Landslip.cpp
===================================================================
--- src/level/Landslip.cpp.orig
+++ src/level/Landslip.cpp
@@ -6,6 +6,7 @@
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  */
+#include <string.h>
 #include "Landslip.h"
 
 #include "Rules.h"