These packages are thanks to Philippe Roussel, the author of SimpleAgenda.
Depending on your system and architecture you should add the respective repository:
| Debian Wheezy i386 | http://coyote.octets.fr/pub/gnustep/packages/wheezy/i386/ |
| Debian Wheezy amd64 | http://coyote.octets.fr/pub/gnustep/packages/wheezy/amd64/ |
| Ubuntu Precise i386 | http://coyote.octets.fr/pub/gnustep/packages/precise/i386/ |
| Ubuntu Precise amd64 | http://coyote.octets.fr/pub/gnustep/packages/precise/amd64/ |
| Ubuntu Quantal i386 | http://coyote.octets.fr/pub/gnustep/packages/quantal/i386/ |
| Ubuntu Quantal amd64 | http://coyote.octets.fr/pub/gnustep/packages/quantal/amd64/ |
| Ubuntu Raring amd64 | http://coyote.octets.fr/pub/gnustep/packages/raring/amd64/ |
For example for Debian Wheezy amd64:
deb http://coyote.octets.fr/pub/gnustep/packages/wheezy/amd64/
./
And after update the packages list you can install the package fisicalab.app. If you don't like the default look and feel, you can install the theme Silver, a more suited theme to other desktops (just unpack and copy the content at ~/GNUstep/Library/Themes at your home directory). Once installed run in a terminal:
defaults write NSGlobalDomain GSTheme Silver
defaults write NSGlobalDomain GSAppOwnsMiniwindow NO
defaults write NSGlobalDomain GSSuppressAppIcon YES