This is what we previously did with ‘my-hello’. With the Scheme basics we’ve
covered, we are now able to explain the leading chunks. As stated in guix
package --help:
-f, --install-from-file=FILE
install the package that the code within FILE
evaluates to
Thus the last expression must return a package, which is the case in our earlier example.
The use-modules expression tells which of the modules we need in the file.
Modules are a collection of values and procedures. They are commonly called
“libraries” or “packages” in other programming languages.