zfs code - Sep 2010 - How to build debug version of zfs command line utilities?

Folks,

I need to step through and debug zfs command line programs. I have downloaded
all the source code from the ON gate. The source code for zfs is at
/usr/src/cmd/zpool and /usr/src/cmd/zfs.

There is a Makefile available under zpool directory. My plan is to modify this
Makefile and add "-g" to compiler options for debug build.

However, while trying to run make on the original Makefile, I get a bunch of
errors. The first one is undefined "SRC" variable. I fixed that by
defining SRC in the shell. The next error I get is something about "empty
variable name" in Makefile.cmd at line 166.

Clearly, there is something that I am not doing right. Can someone please tell
me how to build just zfs so that I can step through and debug the code?

Thank you in advance for your help.

Regards,
Peter
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