This is a simple GTK+ 3 reminding application.
You can download, compile and run this with the following commands. You need to have git, a make program, GTK+ 3 and a C compiler installed.
$ git clone https://github.com/Akuli/gtk-reminder
$ cd gtk-reminder
$ make
$ ./reminder
If you want to, you can install this program to /usr/local or uninstall
it easily:
# make install
# make uninstall
Or you can install or uninstall using a custom prefix:
$ make PREFIX=~/my-prefix install
$ make PREFIX=~/my-prefix uninstall