pineappl | PineAPPL is not an extension of APPLgrid

PineAPPL is written in Rust and therefore needs the Rust compiler and build system cargo. If cargo isn't installed, use your favourite package manager to install it, or go to https://www.rust-lang.org/tools/install and follow the instructions there.
Next install the command-line interface: cargo install --path pineappl_cli This will install the binary pineappl user-wide, typically into ~/.cargo/bin. You can use this binary to perform all kinds of operations on PineAPPL grid files.
Proceed by installing cargo-c, which is required for the next step: cargo install cargo-c
Install pineappl_capi (the C API, needed if you plan to use PineAPPL in your C, C++, Fortran, or Python program): cd pineappl_capi cargo cinstall --release --prefix=${prefix} cd .. where ${prefix} points to the desired installation directory.
Finally, you need to set the environment variables PKG_CONFIG_PATH and LD_LIBRARY_PATH to the right directories. Adding export LD_LIBRARY_PATH=${prefix}/lib:$LD_LIBRARY_PATH export PKG_CONFIG_PATH=${prefix}/lib/pkgconfig:$PKG_CONFIG_PATH to your ~/.bashrc should do the trick (remember to replace ${prefix} with the correct directory). You can check PKG_CONFIG_PATH by running pkg-config pineappl_capi --libs which should print the library flags needed to link against the C API. If there's no output or an error, double-check that PKG_CONFIG_PATH is in the environment and that it points to a directory containing the pineappl_capi.pc file.
For the python interface (optional) please look into the subfolder ./pineappl_py