compiling kernel

[Josip]

Let me first just say that I'm new to FreeBSD. I'm tring to compile a 
custom kernel and when I do "make buildkernel KERNCONF=NEWKERN"  I get  
this:
perl5 /usr/src/sys/kern/vnode_if.pl -h /usr/src/sys/kern/vnode_if.src
perl5:No such file or directory.

Both files are in the specified dir.

When I run the above command manualy it execues OK and creates the file 
vnode_if.h in pwd.

What am I doing wrong?

Thanks!

PS Also if I do "make buildkernel KERNCONF=GENERIC" I get the same error!