Does not compile under ubuntu linux

When trying to compile under Ubuntu 15.10 by issuing "make" it produces a lot of error messages 
"undefined reference to `std::...."

Changing from gcc to g++ in Makefile solves the problem:

```
CC=g++
INCLUDES=-I$(shell pwd)/include
CPPFLAGS=$(INCLUDES) -DVERSION="\"$(VERSION)\"" -DDEFAULT_GCODE_TYPE=emc

LD=g++
#LIBS=-lstdc++
```
