4.3.1 Sieve #include directive

The #include directive reads in the contents of the given file. The contents is “inserted” into the text being parsed starting at the line where the directive appears. The directive takes two forms:

#include "filename"

The filename is taken relative to the current directory.

#include <filename>"

The filename is searched in the list of include directories as specified by the -I command line options.

If filename starts with a directory separator character (‘/’) both forms have the same effect.