If Kpathsea cannot otherwise find a file, for some file types it is configured by default to invoke an external program to create it dynamically (see section `MakeTeX' configuration). This is most useful for fonts (bitmaps, TFM's, and arbitrarily-sizable Metafont sources such as the Sauter and DC fonts), since any given document can use fonts never before referenced. Trying to build all fonts in advance is therefore impractical, if not impossible.
The script is passed the name of the file to create and possibly other arguments, as explained below. It must echo the full pathname of the file it created (and nothing else) to standard output; it can write diagnostics to standard error.
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