On Manjaro with all current updates.
Was running Boinc Manager 7.16.11-1 package with no problems for quite a while.
Now boincmgr is failing with:

$ boincmgr
10:44:36: Warning: Mismatch between the program and library build versions detected.
The library used 3.0 (wchar_t,compiler with C++ ABI 1013,wx containers,compatible with 2.8),
and your program used 3.0 (wchar_t,compiler with C++ ABI 1014,wx containers,compatible with 2.8).

Tried uninstalling the boinc package.

And, the downloaded the recommend 7.4.22 from the boinc website.

The installation shell script appeared to work. But, when I:

$ ./BOINC/run_manager
./boincmgr: error while loading shared libraries: libnotify.so.4: cannot open shared object file: No such file or directory

libnotify 0.7.9-1 is installed.

But, apparently it is the wrong version.

Don't download the recommended version from the website. This is an ancient one with many problems of its own, probably certificate trouble as well. It's still there because that was the last version BOINC made by itself, since this version the package maintainers of the various distros have been building and distributing BOINC. This so the package is built using libraries that work on that distro.

So please return to the 7.16 version. A Linux guru will be along shortly, I bet.

Use the Manjara package manager Pamac (or Octopi if it’s installed) and search for Boinc, you might have to enable AUR (the user repositories) first. See :-

http://www.linuxandubuntu.com/home/install-and-remove-software-in-manjaro