I'm just getting started experimenting with guix and guile, so I'm
likely missing something obvious.
I'm trying to write a package definition for some software that builds
with cmake and uses glib. The software searches some paths explicitly to
find the glib headers etc; it should be fixed to use pkg-config instead,
but I'd like to figure out how to work around it both as a learning
exercise and so that I can work around it before I can get a fix merged.
I'd like to add some explicit flags to the cmake invocation so that it
knows where to find glib. What do I substitute in for "get-store-path"
below? Pointers to how I might have found the appropriate helper or
approach on my own also appreciated.
```
(define-public oniontrace
(package
(name "oniontrace")
(build-system cmake-build-system)
(inputs `(("glib", glib)))
(arguments
'(#:configure-flags
(list (string-append "-DCMAKE_EXTRA_INCLUDES=" (get-store-path
"glib") "/include"))))
...
```
