avr-gcc.exe: no input files

I am on windows7 (64 bit), trying to get my first example working on Cygwin. I get following error

$ make -f …/Makefile
mkdir -p .lib//cygdrive/c/Users/kashili/Harmonia/Downloads/Arduino/hardware/arduino/cores/arduino/
/cygdrive/c/Users/kashili/Harmonia/Downloads/Arduino/hardware/tools/avr/bin/avr-gcc -Os -Wall -fno-exceptions -ffunction-sections -fd -Iutility -I/cygdrive/c/Users/kashili/Harmonia/Downloads/Arduino/hardware/arduino/cores/arduino -I/cygdrive/c/Users/kashili/Harmonia/o/cores/arduino/wiring_shift.c.o /cygdrive/c/Users/kashili/Harmonia/Downloads/Arduino/hardware/arduino/cores/arduino/wiring_shift.c
avr-gcc.exe: /cygdrive/c/Users/kashili/Harmonia/Downloads/Arduino/hardware/arduino/cores/arduino/wiring_shift.c: No such file or direc
avr-gcc.exe: no input files
…/Makefile:365: recipe for target '.lib//cygdrive/c/Users/kashili/Harmonia/Downloads/Arduino/hardware/arduino/cores/arduino/wiring_sh
make: *** [.lib//cygdrive/c/Users/kashili/Harmonia/Downloads/Arduino/hardware/arduino/cores/arduino/wiring_shift.c.o] Error 1

I have following file in my local unlike error message /cygdrive/c/Users/kashili/Harmonia/Downloads/Arduino/hardware/arduino/cores/arduino/wiring_shift.c

This line looks suspicious (lib//)
mkdir -p .lib//cygdrive/c/Users/kashili/Harmonia/Downloads/Arduino/hardware/arduino/cores/arduino/
I reviewed the following similar thread, but could not solve my problem.

I type echo %GCC_EXEC_PREFIX%, it returns %GCC_EXEC_PREFIX%

It seemed from the forum that Arduino is supported on cygwin (not sure of 64 bit though…?).
Is the problem with my hardware/os/cygwin or problem with Arduino…any further hints?
Any help is appreciated

kashili: I am on windows7 (64 bit), trying to get my first example working on Cygwin.

You're trying to do what?