Fossil

Some files require special C-preprocessor macro definitions.
When compiling sqlite.c, the following macros are recommended:

  *  -DSQLITE_OMIT_LOAD_EXTENSION=1
  *  -DSQLITE_ENABLE_LOCKING_STYLE=0
  *  -DSQLITE_THREADSAFE=0
  *  -DSQLITE_DEFAULT_FILE_FORMAT=4
  *  -DSQLITE_ENABLE_EXPLAIN_COMMENTS=1

The first symbol definition above is required; the others
are merely recommended.  Extension loading is omitted
as a security measure.  Fossil is single-threaded so mutexing is disabled
in SQLite as a performance enhancement.
in SQLite as a performance enhancement.  The SQLITE_ENABLE_EXPLAIN_COMMENTS
option makes the output of "EXPLAIN" queries in the 
"[/help?cmd=sqlite3|fossil sql]" command much more readable.

When compiling the shell.c source file, these macros are required:

  *  -Dmain=sqlite3_main
  *  -DSQLITE_OMIT_LOAD_EXTENSION=1

The "main()" routine in the shell must be changed into sqlite3_main()