https://people.freebsd.org/~rpaulo/poudriere/build.html
```
% fsharpi
F# Interactive for F# 3.1 (Open Source Edition)
Freely distributed under the Apache 2.0 Open Source License
For help type #help;;
> let f = 1;;
val f : int = 1
> printfn "%d" f;;
1
val it : unit = ()
> #help;;
F# Interactive directives:
#r "file.dll";; Reference (dynamically load) the given DLL
#I "path";; Add the given search path for referenced DLLs
#load "file.fs" ...;; Load the given file(s) as if compiled and referenced
#time ["on"|"off"];; Toggle timing on/off
#help;; Display help
#quit;; Exit
F# Interactive command line options:
See 'fsharpi --help' for options
>
```