[sqlite] SQLITE_ENABLE_LOCKING_STYLE status?

I'm trying to use the network filesystem support on Mac OS X that is, to my understanding, enabled by the SQLITE_ENABLE_LOCKING_STYLE flag. As also noted by someone else in the archives of this list, I'm finding that Sqlite 3.5.6 won't compile with the flag defined. I noticed that there

[sqlite] SQLITE_ENABLE_LOCKING_STYLE

I am sorry if the question is too obvious but I haven't found any documentation about the SQLITE_ENABLE_LOCKING_STYLE macro (it is in os.c). Should I set it to 0 (default) or 1? I need to be able to access database files located on shared volumes on OS X. Which are the implications of