This is a LLVM backend for Idris.
Idris-llvm uses llvm-hs to bind to LLVM, it requires that a recent LLVM (at the moment LLVM 4.0) is installed in a location that GHC knows about. Required C libraries are the Boehm GC (it could be called "libgc" or "gc") and GMP.
If the prerequisites are met cabal install should be sufficient to build and install idris-llvm.
There needs to be a clang executable available to build the programs. gcc will not work as the input files to clang are LLVM files.
How to build an executable:
idris myprog.idr --codegen llvm -o myprog