### https://www.geany.org/Download/Git#nightly ####
You must have 'source' in your sources.list

# you need all of the following installed (including GTK2.0)
sudo apt-get update
sudo apt-get install autoconf
sudo apt-get install libtool
sudo apt-get install gettext
sudo apt-get install pkg-config
sudo apt-get install intltool
sudo apt-get install gcc
sudo apt-get install g++
sudo apt-get install make
sudo apt-get install gdb

sudo apt-get install glib2.0
sudo apt-get install gtk2.0
sudo apt-get install gtk3.0
sudo apt-get install docutils-common
sudo apt-get install git

cd ~/Downloads
git clone git://github.com/geany/geany.git geany

cd ~/Downloads/geany
sudo apt-get build-dep geany
./autogen.sh --enable-gtk3
make
make check
sudo make install

# repeat for plugins
# NOTE: geany must be made and installed before doing the geany-plugins

cd ~/Downloads
git clone https://github.com/geany/geany-plugins.git
cd ~/Downloads/geany-plugins
sudo apt-get build-dep geany-plugins
./autogen.sh 
make
make check
sudo make install