GNU/Linux

Lem 2.1 was released! It provides binaries for Linux, MacOS and Windows.

Dependencies:

• sbcl
• sdl2
• qlot
• git

• Debian-like distro

sudo apt install sbcl build-essential libsdl2-dev libsdl2-image-dev libsdl2-ttf-dev

• Fedora-like distro

sudo dnf install sbcl SDL2-devel SDL2_image-devel SDL2_ttf-devel
sudo dnf group install c-development development-tools

• Automatic installer

curl -L https://qlot.tech/installer | bash

Note: For an alternative installation, see https://github.com/fukamachi/qlot#installation

There are two ways to install Lem:

1. Local installation:

mkdir $HOME/common-lisp
cd $HOME/common-lisp
git clone https://github.com/lem-project/lem.git
cd lem && make sdl2

Note: You can also run make sdl2-ncurses to build Lem with both the SDL2 and ncurses interfaces. You can then choose the interface at startup with -i / --interface, either “sdl2” or “ncurses”.

Then add the executable to your PATH by adding this line to your ~/.bashrc:

export PATH="$HOME/common-lisp/lem:$PATH"

2. System-wide installation:

git clone https://github.com/lem-project/lem.git
cd lem

First ensure qlot is installed for the root user:

sudo bash -c "curl -L https://qlot.tech/installer | bash"

Then install Lem:

sudo make install

This will:

• Build Lem with both SDL2 and ncurses interfaces
• Install the executable system-wide
• Add a desktop entry file with relevant file associations
• Configure SDL2 as the default interface

You can still switch between interfaces using the -i / --interface option when launching Lem.