please help me . cygpath: can't convert empty path

[Altera_Forum]

**** Build of configuration Default for project mynios_ch395 **** 

  make all  系统找不到指定的路径。 系统找不到指定的路径。 Info: Building ../mynios_ch395_bsp/ make --no-print-directory -C ../mynios_ch395_bsp/ cygpath: can't convert empty path process_begin: CreateProcess(NULL, pwd, ...) failed. make[1]: *** No rule to make target `/system.h', needed by `all'. Stop. make: *** [../mynios_ch395_bsp/-recurs-make-lib] Error 2   **** Build Finished ****  do i need to install MinGW and Msys? how to ?

[Altera_Forum]

You only get the necessary definitions if you run your build in the Nios II command shell. This is in the windows start menu.