[Linux] Error in Build in Cartpole Example due to sdl2-gfx

[yunho-c]

Hi, I encountered a few errors in building the cartpole example.

I was able to get them sorted out, but still making this issue to document. Things I had to do to solve:

• Install cmake (sudo apt install cmake)
  • This was a fresh installation that didn't happen to have cmake installed, which is unlikely, yet possible for beginners/students
• Add the following lines to cargo.toml (not sure if this is strictly required... but nonetheless resolved an error)
  • and run cargo vcpkg build before cargo build

[package]
name = "gym-rs"
...

[dependencies]
...

+ [package.metadata.vcpkg]
+ dependencies = ["sdl2", "sdl2-gfx"]
+ git = "https://github.com/microsoft/vcpkg"
+ rev = "501db0f" # or change based on the latest release in GitHub

• Install libsdl2-gfx-dev in addition to libsdl2-dev
  • I feel that other users may encounter the same issue; perhaps would be good to update readme

Thanks for making this awesome library! Feel free to investigate more or close the issue.

[yunho-c]

Relevant StackOverflow Discussions

• https://stackoverflow.com/questions/16710047/usr-bin-ld-cannot-find-lnameofthelibrary
• https://stackoverflow.com/questions/75781517/sdl2-how-to-install-and-use-the-gfx-feature

[benbaarber]

I had the same issue with /usr/bin/ld: cannot find -lSDL2_gfx: No such file or directory. Running sudo apt install libsdl2-gfx-dev fixed it for me, personally I did not need to add anything from the second bullet. Thank you for documenting this!

[GDur]

Would be nice if someone would implement it using macroquad instead of sdl2. ✨