#ifdef CPU_X86
int CPU_Cores() {
	static int n;
	ONCELOCK {
		// platform dependent code to find out number of cores
	}
	return n;
}
#else
inline int CPU_Cores() {
	return 1;	
}
#endif

1.
I've used the tarball version:
http://www.ultimatepp.org/www$uppweb$nightly$en-us.html
....
First of all, we need some packages: libx11, libxft, libnotify, libgtk2.0, libbz2
	apt-get install libx11-dev libxft-dev libnotify-dev libgtk2.0-dev libbz2-dev

2. Edit ./uppsrc/Core/config.h Line 91,
	Change
		#elif __arm // ToDo!
	to
		#elif __arm || __arm__ // ToDo
	
3. Edit /usr/include/glib-2.0/glib/gtypes.h Line 34,
	Change 
		#include <glibconfig.h>
	to
		#include </usr/lib/arm-linux-gnueabihf/glib-2.0/include/glibconfig.h>

4. Linking gdkconfig.h
	ln -s /usr/lib/arm-linux-gnueabihf/gtk-2.0/include/gdkconfig.h /usr/include/

5. Edit ./uppsrc/Core/Cpu.cpp Line 104,
	Change
		inline int CPU_Cores()
	to
		int CPU_Cores()
6. do a "make" and compile it!