Rarian does not index doc-base documents

Rarian can index scrollkeeper omfs but doesn't do this for doc-base, so doc-base documents are unavailable for applications used rarian - Yelp for example. To check this package "gcc-4.2-doc" (only for example, there are many others) can be installed and then one may try to search for gcc manual in Yelp which fails.

Doc-base omf files are installed somewhat differently from others: they are put into /var/lib/doc-base/omf and this location is linked to /usr/share/omf/doc-base. Rarian looks for OMF files in each directory listed by $XDG_DATA_DIRS variable plus /omf suffix which includes /usr/share/omf, but /var/lib/doc-base/omf is not searched at all. If /var/lib/doc-base/omf path was appended by hand to $XDG_DATA_DIRS rarian would find everything and documentation would be available in Yelp.

Why rarian doesn't find doc-base omfs despite they are linked to /usr/share/omf/doc-base/ ? Because it expects some directory structure to be present at /omf site - something like path-to-data/omf/name/name-LANG.omf, and so rarian will try to open /usr/share/omf/doc-base/doc-base-LANG.omf which obviously will fail.