user:file_search_path/2 facts are best defined using
the initialization file ~/.sicstusrc or ~/sicstus.ini, which is
consulted at startup time by the Development System. Therefore, with
reference to the examples from ref-fdi-fsp-def,
clauses like the one following should be placed in the initialization file so
that they are automatically available to user programs after startup:
:- multifile user:file_search_path/2. user:file_search_path(home, '/usr/jackson'). user:file_search_path(sp_directory, home('prolog/sp')). user:file_search_path(demo, 'etc/demo').