Build emulator in Windows doesn't work

$ make TARGET=emu_devo8 WINDOWS=1
 + Compiling 'target/emu_devo8/channels.c'
 + Compiling 'target/emu_devo8/lcd.c'
 + Compiling 'target/common_emu/clock.c'
In file included from C:/MinGW/msys/1.0/include/time.h:32:0,
                 from target/common_emu/clock.c:18:
C:/MinGW/msys/1.0/include/sys/types.h:106:14: error: conflicting types for 'int8_t'
 typedef char int8_t;
              ^
In file included from c:\mingw\lib\gcc\mingw32\4.8.1\include\stdint.h:9:0,
                 from ./common.h:4,
                 from target/common_emu/clock.c:16:
c:\mingw\include\stdint.h:39:21: note: previous declaration of 'int8_t' was here
 typedef signed char int8_t;
                     ^
make: *** [objs/emu_devo8-w32/clock.o] Error 1

make: *** No rule to make target `c:\mingw\lib\gcc\mingw32\4.8.1\include\stdint.h', needed by `objs/emu_devo8-w32/channels.o'.  Stop.