IDE 0013: error compiling (WProgram.h stlib.h)

I have a sketch that works with the IDE 0011 (Windows Vista), I've just installed the new version (IDE 0013) but I can't compile because it gives me an error.

This is the error:

In file included from C:\Program Files\arduino-0013\hardware\cores\arduino/WProgram.h:4,
c:/program files/arduino-0013/hardware/tools/avr/lib/gcc/../../avr/include/stdlib.h:111: error: expected unqualified-id before 'int'
c:/program files/arduino-0013/hardware/tools/avr/lib/gcc/../../avr/include/stdlib.h:111: error: expected )' before 'int' c:/program files/arduino-0013/hardware/tools/avr/lib/gcc/../../avr/include/stdlib.h:111: error: expected )' before 'int'
In file included from C:\Program Files\arduino-0013\hardware\cores\arduino/WProgram.h:6,

Can anybody help me?
Thanks in advance.

mtz

No need to crosspost. I'm responding in http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1234435095