+ ;; FIXME: This is a copy of the standard configure phase with a tiny
+ ;; difference: this package needs the -package-db flag to be passed
+ ;; to "runhaskell" in addition to the "configure" action, because
+ ;; Setup.hs depends on filemanip. Without this option the Setup.hs
+ ;; file cannot be evaluated. The haskell-build-system should be
+ ;; changed to pass "-package-db" to "runhaskell" in any case.
+ (replace 'configure
+ (lambda* (#:key outputs inputs tests? (configure-flags '())
+ #:allow-other-keys)
+ (let* ((out (assoc-ref outputs "out"))
+ (name-version (strip-store-file-name out))
+ (input-dirs (match inputs
+ (((_ . dir) ...)
+ dir)
+ (_ '())))
+ (ghc-path (getenv "GHC_PACKAGE_PATH"))
+ (params (append `(,(string-append "--prefix=" out))
+ `(,(string-append "--libdir=" out "/lib"))
+ `(,(string-append "--bindir=" out "/bin"))
+ `(,(string-append
+ "--docdir=" out
+ "/share/doc/" name-version))
+ '("--libsubdir=$compiler/$pkg-$version")
+ '("--package-db=../package.conf.d")
+ '("--global")
+ `(,@(map
+ (cut string-append "--extra-include-dirs=" <>)
+ (search-path-as-list '("include") input-dirs)))
+ `(,@(map
+ (cut string-append "--extra-lib-dirs=" <>)
+ (search-path-as-list '("lib") input-dirs)))
+ (if tests?
+ '("--enable-tests")
+ '())
+ configure-flags)))
+ (unsetenv "GHC_PACKAGE_PATH")
+ (apply invoke "runhaskell" "-package-db=../package.conf.d"
+ "Setup.hs" "configure" params)
+ (setenv "GHC_PACKAGE_PATH" ghc-path)
+ #t)))