Liblouis User's and Programmer's Manual

7.3 How tables are found ¶

liblouis knows where to find all the tables that have been distributed with it. So you can just give a table name such as en-us-g2.ctb and liblouis will load it. You can also give a table name which includes a path. If this is the first table in a list, all the tables in the list must be on the same path. You can specify a path on which liblouis will look for table names by setting the environment variable LOUIS_TABLEPATH. This environment variable can contain one or more paths separated by commas. On receiving a table name liblouis first checks to see if it can be found on any of these paths. If not, it then checks to see if it can be found in the current directory, or, if the first (or only) name in a table list, if it contains a path name, can be found on that path. If not, it checks to see if it can be found on the path where the distributed tables have been installed. If a table has already been loaded and compiled this path-checking is skipped.