The convertertable must be in the ICU ucm (Unicode Codepage Mapping) format in order to be understood by makeconv. The ICU ucm format is similar to the IBM NLTC upmap/tpmap/rpmap files. Comments in the convertable are handled as follows. If a comment (starting with a `#' sign) that is after some text does contain the fallback indicator `|' then only the text starting with the `#' sign, and ending before the `|' sign, is ignored. Otherwise, or if the comment is the first thing on the line, the comment runs up to the end of the line. This special handling of comments is to accomodate the practice of putting fallback information in comments in the strict IBM NLTC ucmap format.

Note that new converters will be automatically found by ICU after their installation in ICU's data directory. They do not need to be listed in the convrtrs.txt(5) converters aliases file in order to be available to applications using ICU. They do need to be listed there if one wants to give them aliases, or tags, though.

-h, -?, --help

Print help about usage and exit.

-c, --copyright

Include a copyright notice in the binary data.

-v, --verbose

Display extra informative messages during execution.

-d, --destdir destination

Set the destination directory to destination. The default destination directory is specified by the environment variable ICU_DATA.

ICU_DATA

Specifies the directory containing ICU data. Defaults to /usr/share/icu/3.6/. Some tools in ICU depend on the presence of the trailing slash. It is thus important to make sure that it is present if ICU_DATA is set.