Undefined reference to operator new

Maybe you're calling gcc, the C compiler instead of g++, which is the C++ compiler.

There's very little information in your question to work from, but it looks like some code uses some form of placement new, and while that special operator new is declared (the compiler finds it and compiles the code using it), the linker can't find its definition.

(Since this old answer of mine seems to still get attention: See here for an extensive discussion on declaration vs. definition.)

You probably need to link with the C++ support runtime library. This happens automatically when you invoke g++. On Linux, this is achieved by adding the -lstdc++ flag to the linker. You have to figure out how to do the same on your platform.