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

**** 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 ?