mach needs "redundant" BuildRequires

[John Dalbec <jpdalbec ysu edu>]

According to http://www.fedora.us/wiki/HOWTOFindMissingBuildRequires, neither 
gcc-c++ nor python should be listed as a BuildRequires:.  However, the default 
mach configuration does not install either package on Red Hat 7.2 unless it is 
listed as a BuildRequires:.  I'm trying to build XFree86.  Should I add gcc-c++ 
as a BuildRequires or change my /etc/mach/dist file?
Thanks,
John