Fix Linux build.

src/common/debug.h

@@ -119,7 +119,9 @@ namespace gl
 #if defined(_MSC_VER) && _MSC_VER >= 1600
 #define META_ASSERT_MSG(condition, msg) static_assert(condition, msg)
 #else
-#define META_ASSERT_MSG(condition, msg) typedef int COMPILE_TIME_ASSERT_##__LINE__[static_cast<bool>(condition)?1:-1]
+#define META_ASSERT_CONCAT(a, b) a ## b
+#define META_ASSERT_CONCAT2(a, b) META_ASSERT_CONCAT(a, b)
+#define META_ASSERT_MSG(condition, msg) typedef int META_ASSERT_CONCAT2(COMPILE_TIME_ASSERT_, __LINE__)[static_cast<bool>(condition)?1:-1]
 #endif
 #define META_ASSERT(condition) META_ASSERT_MSG(condition, "compile time assertion failed.")
 

src/common/mathutil.cpp

@@ -8,6 +8,7 @@
 
 #include "common/mathutil.h"
 #include <algorithm>
+#include <math.h>
 
 namespace gl
 {

src/common/mathutil.h

@@ -17,6 +17,7 @@
 
 #include <limits>
 #include <algorithm>
+#include <string.h>
 
 namespace gl
 {

src/common/utilities.h

@@ -18,6 +18,7 @@
 #include <GLES2/gl2ext.h>
 
 #include <string>
+#include <math.h>
 
 namespace gl
 {