Hi Julien!
I think you need to remove the apply, but keep one level of parenthesis, like so:((assoc-ref …) args …)Apply takes the last arguments, which must be a list and appends all its elements to the invocation. Like (apply foo '(1 2 3 4)) is tge same as (foo 1 2 3 4). Here you're probably confused because of the assoc-ref is not a procodure, but it's fine: it returns a procedure, so guile can execute it and pass arguments to it the normal way.
So I tried the following:
```
(replace 'install
(lambda _
(for-each (lambda (solution)
(with-directory-excursion solution
((assoc-ref copy:%standard-phases 'install)
#:install-plan
'(("src" (string-append
"include/" solution)
#:include-regexp ("\\.h$"))))))
(list
"qtlockedfile"
"qtpropertybrowser"
"qtservice"
"qtsingleapplication"
"qtsoap"))
#t))
```
I get "In procedure string-append: Wrong type (expecting string): #f",
with and without replacing `(string-append "include/" solution)` with
`"include"`.
Regards, RG.
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