As you know, Devhelp is an API documentation browser for GTK+ and GNOME. It by default have included reference for many GTK+ related libraries but it doesn't have Gtkmm, the C++ wrapper for GTK+, which has an online reference in gnome official reference website.
I need to get an offline reference for Gtkmm so I can keep studying while not online. I read in the description of Murrayc web page that this can be added somehow, but that link and webpage seem to dead long ago.
So,is there a way to add this official library reference to my Devhelp app?
On Ubuntu, documentation is separate from normal packages (both because of space and because of licensing). As such, you will need to install separate packages to get gtkmm's documentation:
libgtkmm-3.0-doc for gtkmm for GTK+ 3libgtkmm-2.4-doc for gtkmm for GTK+ 2There are a number of ways you can find these packages. If you know the name of the library, you can do sudo apt-get install libname on the command line and press Tab a few times to try to tab-complete the package name. You should see one with -doc at the end. You can also use a package management tool like Synaptic to find relevant packages.
The same rules apply to header files and linker libraries; substitute -doc with -dev.