This is a patch against pgSequence.cpp to get it to compile on Mac OS
X. Currently atoLongLong is #define'd as atoll() on UNIX, but Mac OS X
doesn't have an atoll(). Since atoll() is just a wrapper for strtoll()
and Mac has strtoll(), I just added another define.
In addition, there are some problems with the autoconf code on the Mac
platform which I will be fixing over the weekend.
ahp