save a log

Please help me with another small but important issue: 

I want to log my fast cgi application's activity to a log file. I met two problems: 

1. How to write to disk. 
I found FCGI_ToFile from fcgi_stdio.h on http://www.fastcgi.com/devkit/doc/fcgi-devel-kit.htm, and it did not work - the identifier is not defined. I found FCGI_ToFILE in fcgi_stdio.h, but it did no work - some conversion can not be performed. 

2. How to write to /var/log/myapp.log. 
Only root can write to /var/log/ and to most /var/log/* files. I just disabled suexec for security reasons, following apache's site advice. Should I enable it just for the sake of logging? Should I write the log in my default cgi directory, /usr/lib/cgi-bin/? What security risks would be posed by each of these solutions? 

Because I am not using FCGI_Finish, I am now logging to apache's error log, which is a weird solution. 

What do you think is the best way to log from fast cgi? 

Thank you for your help, 
Doru