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Detail some limitations

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@ -55,11 +55,11 @@ However there is still two configurations variables hardcoded in the wrapper.
Open a bug / pull request if this does not work on your distribution / driver.
It works with `primus`, but there is some artifacts.
It works with `primus`, but there is some artifacts, mostly due to the next fundamental issue:
## Fundamental issue
If your program libraries depends on different version of the same library, for example, this dependency tree:
If your program libraries depends on different versions of the same library, for example, this dependency tree:
```
program
@ -69,4 +69,14 @@ program
libBar-1.2
```
One version or the other of `libBar` may be used. In practice this does not happen a lot.
One version or the other of `libBar` may be used. In practice this does not happen a lot.
A similar issue will happen if your system `libGL.so` depends on some library which are already in your program dependency list. Undefined behaviors can happen.
## Subprocessus
It does not work with subprocessus, that's all ;(
## Haskell Stack `exec`
You need to call `stack --nix exec -- nixGL yourProgram` instead of `nixGL stack exec -- yourProgram` du to the incompatibility with subprocessus. If `nixGL` is not installed in your stack environment, you can use `stack --nix --no-nix-pure exec ...`.