PSL1GHT is a lightweight PlayStation 3 homebrew SDK, provided as a temporary way to compile user apps to run from the XMB using the open-source PS3 toolchains available.
A GCC toolchain that supports the PowerPC 64bit architecture is required to build PSL1GHT and its samples. It also requires the toolchain to provide a full newlib environment; at the moment only two toolchains do so:
The SDK also includes a few standalone tools to help compilation. A host gcc is required to build raw2h, and sprxlinker requires libelf. Python 2.x is required to run fself.py
Run make install in the psl1ght directory to build it all, and make sure to set the environment variable $PSL1GHT to the folder where you wish to install it to, for example...
cd /path/to/psl1ght.git
export PSL1GHT=/path/to/psl1ght.git/build
make
make install
... for a local build of it. Ensure that $PSL1GHT is set when you are building any of the examples or other apps that use PSL1GHT.
At the moment, PSL1GHT has basic libc support with stdout debugging, file access, and network support. It doesn't have any way to access the screen or graphics at the moment. You can call lv2 syscalls and do some fun stuff with that, and you can link to the PS3 dynamic libraries (sprx) to bring in all of the exciting functionality.