Jprof

Has anybody build moz with Jprof on Linux lately?  I have followed 
insturctions at moz.org but when recompiling mozilla it always crashed the 
build.  When I cd into /tools/jprof I don't see anyfiles nor under the 
only subdirectory.  

I have run cvs co mozilla/tools/jprof a few times but it is not pulling 
down any files. 

I have browsed the tree via LXR and there is no jprof folder under the 
tools folder.

Mike