Replaced the value of the java_home ant property with ${env.JAVA_HOME} instead of the hardcoded original.
Moved the using namespace std; line down below the inclusion of the header files.
This was generating a warning since the compiler does not know about namespace std until it includes a header file.
The IEEE HLA 1516-2010 C++ API does include the following forward declaration

namespace std {
	template <typename T> class auto_ptr;
}

in LogicalTimeFactory.h and RTIambassadorFactory.h.

However, this is not allowed by the C++ standard. So, the API is wrong.

Deleted this forwad declaration from these header files and just #include <memory> instead.