make buildworld

[Doug Hardie]

I am upgrading a server to 6.0 and encountered an error in make  
buildworld.  However, I don't know what the error was as I piped  
stdout to a file, but not stderr.  It was fairly near the end so I  
really hate to restart from the beginning again.  The master server  
is a fairly slow machine.  When  something like this happens, is  
there a way to restart the make where it died?  Is there an easy way  
to build the specific module that failed to get the complete errors?   
In this case the module was /usr/libexec/telnet.  I went to /usr/src/ 
libexec/telnet and did a make.  It completed without any problems.   
So, I ended up restarting the make from the top again, but would like  
to know for future situations.  Thanks.