problem with NiosII IDE 5.1

I have almost find the answer throught altera website.

The following if FYI.

Problem

Why do I receive the following errors when trying to compile my Nios II project: ../app_rules.mk:152: \: No such file or directory?

Solution

You may receive the following errors when compiling a Nios® II software project if the mount point for the Cygwin toolset is not specified properly.

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make -s all

"X"which cygpath.exe 2> /dev/null`" was unexpected at this time.

<Nios II install directory>/components/altera_hal/build/app_rules.mk:152: `: No such file or directory

<Nios II install directory>/components/altera_hal/build/app_rules.mk:152: "<Nios II install directory>"`: No such file or directory

<Nios II install directory>/components/altera_hal/build/app_rules.mk:152: /components/altera_hal/build/gnu_rules.mk: No such file or directory

<Nios II install directory>/components/altera_hal/build/app_rules.mk:156: &#39;: No such file or directory

<Nios II install directory>/components/altera_hal/build/app_rules.mk:156: "<Nios II install directory>"`: No such file or directory

<Nios II install directory>/components/altera_hal/build/app_rules.mk:156: /components/altera_hal/build/gtf_rules.mk: No such file or directory

make: *** No rule to make target `/components/altera_hal/build/gtf_rules.mk&#39;. Stop.

Build completed

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If this error does occur you can specify the proper moint points by running the following three commands from a DOS prompt:

mount <Quartus® II Install directory>\bin\cygwin\ /

mount <Quartus II Install directory>\bin\cygwin\bin /usr/bin

mount <Quartus II Install directory>\bin\cygwin\lib /usr/lib

But when I run the mount command in niosII SDK, it told me that command not found...

Anyone help?

THanks a lot...