use std:: namespace for most cmath functions:

http://en.cppreference.com/w/cpp/header/cmath

code/LWOLoader.cpp

@@ -503,7 +503,7 @@ void LWOImporter::ComputeNormals(aiMesh* mesh, const std::vector<unsigned int>&
 	// Generate vertex normals. We have O(logn) for the binary lookup, which we need
 	// for n elements, thus the EXPECTED complexity is O(nlogn)
 	if (surface.mMaximumSmoothAngle < 3.f && !configSpeedFlag)	{
-		const float fLimit = cos(surface.mMaximumSmoothAngle);
+		const float fLimit = std::cos(surface.mMaximumSmoothAngle);
 
 		for( begin =  mesh->mFaces, it = smoothingGroups.begin(); begin != end; ++begin, ++it)	{
 			const aiFace& face = *begin;