The default version for ubuntu 16.04 is 7.6. I could not find the ppa package for 7.9.3 so I tried to build from the source but failed. The error says "gtk/taskbarex.cpp:17:21: fatal error: gtk/gtk.h: No such file or directory".

I installed the following for the headless ubuntu 16.04 server:
apt-get install git make m4 pkg-config dh-autoreconf libssl-dev libcurl4-openssl-dev libwxgtk-webview3.0-dev libnotify-dev libsqlite3-dev libwxgtk3.0-dev libwxgtk3.0 libgtk-3-dev

Did I miss some packages? Thanks.