Hacked scons scripts and got it building on Ubuntu with clang.

Minor changes to support building on recent clang
Addition of some headers for non-compiling files

src/tools/SConscript

@@ -23,4 +23,4 @@ elif str(platform) == "win32":
 
 tools_obj = env.StaticLibrary("#build/lib/tools", tools)
 
-Return("tools_obj")
+Return("tools_obj")

src/tools/graphtool.cpp

@@ -15,7 +15,7 @@
 #ifdef _WIN32
 #include <windows.h>
 #endif
-#include <GL/GL.h>
+#include <GL/gl.h>
 #endif
 
 #include <iostream>

src/tools/map_parse.cpp

@@ -12,6 +12,7 @@
 #include <cctype>
 #include <iterator>
 #include <numeric>
+#include <cstring>
 
 using namespace std;
 

src/tools/mathutil.hpp

@@ -36,10 +36,8 @@ void erase_if(ContainerT& items, const PredicateT& predicate) {
 };
 
 // Case-insensitive string comparison seems to be semi-standard, but with different names.
-#if defined(__APPLE__)
-#define strnicmp strncasecmp
-#elif defined(_MSC_VER)
+#if defined(_MSC_VER)
 #define strnicmp _strnicmp
 #else
-#error Missing strnicmp / strncasecmp
+#define strnicmp strncasecmp
 #endif

src/tools/tarball.cpp

@@ -10,6 +10,7 @@
 #include <algorithm>
 #include <cstdio>
 #include <ctime>
+#include <cstring>
 
 #ifdef _MSC_VER
 // For some bizarre reason, Visual Studio doesn't declare snprintf in <cstdio>