We have implemented kamailio_docs_readme target https://github.com/kamailio/kamailio/pull/4085#issuecomment-2577661883. My expectation do not trigger xslt transformation and just rebuild the modules readme file.
This target will build the readmes from scratch and replace all readme files found in the source trees. If you want only to install them, `install` target will pick the READMEs found in the source tree, or build the target `install_kamailio_docs`.
gmake[3]: *** No rule to make target '/root/rpmbuild/BUILD/kamailio-6.0.0-build/kamailio-6.0.0-pre0/src/modules/ims_qos_npn/doc/ims_qos_npn.xml', needed by 'src/modules/ims_qos_npn/ims_qos_npn.txt'. Stop.
The error is here. It seems that the `xml` file in `ims_qos_npn` modules is named `ims_qos.xml` instead of `ims_qos_npn.xml`. Try changing it to the module name and try again!