Attempting to compile PG 7.4.13 on a MBP (OSX 10.4.8, Intel), this happens:

===
gcc -no-cpp-precomp -O2 -fno-strict-aliasing -Wall -Wmissing-prototypes
-Wmissing-declarations -I../../../../src/include -I/sw/include/ -c -o
xlog.o xlog.c
In file included from ../../../../src/include/storage/spin.h:50,
from xlog.c:35:
.../../../../src/include/storage/s_lock.h:543:2: error: #error PostgreSQL
does not have native spinlock support on this platform. To continue the
compilation, rerun configure using --disable-spinlocks. However,
performance will be poor. Please report this to pgsql-bugs (AT) postgresql (DOT) org.
In file included from ../../../../src/include/storage/spin.h:50,
from xlog.c:35:
.../../../../src/include/storage/s_lock.h:551: error: conflicting types
for 'slock_t'
.../../../../src/include/pg_config_os.h:11: error: previous declaration
of 'slock_t' was here
make[4]: *** [xlog.o] Error 1
make[3]: *** [transam-recursive] Error 2
make[2]: *** [access-recursive] Error 2
make[1]: *** [all] Error 2
make: *** [all] Error 2
===

I gather this means that PG 7.4.13 is incompatible with Intel Macs?

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TIP 5: don't forget to increase your free space map settings

I suggest you use the newer 8.1.X.

---------------------------------------------------------------------------

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--
Bruce Momjian bruce (AT) momjian (DOT) us
EnterpriseDB http://www.enterprisedb.com

+ If your life is a hard drive, Christ can be your backup. +

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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match