With both my previous bad experience building qtel (the Linux EchoLink client) and recent discussions on a forum around similar difficulties – I thought I’d identify, resolve and document the issues.
I’m not sure what’s changed but the process is now very simple (Fedora 28):-
git clone https://github.com/sm0svx/svxlink.git
sudo dnf install cmake libsigc++20-devel qt-devel popt-devel libgcrypt-devel gsm-devel tcl-devel
cp bin/qtel DESTINATION_PATH_OF_CHOICE
Depending on libs already installed, additional packages may be required – as indicated by failures during the ‘cmake’ stage.