build-system/haskell: Fix register phase.

This is a follow-up to commit a7e231a2a3.

Reported by Marius Bakke <mbakke@fastmail.com>.

* guix/build/haskell-build-system.scm (register): Use "when" instead of
"unless".
This commit is contained in:
Ricardo Wurmus 2018-11-12 18:21:04 +01:00
parent 8c5749f1b5
commit 1767581fb5
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@ -239,7 +239,7 @@ (define (install-transitive-deps conf-file src dest)
(list (string-append "--gen-pkg-config=" config-file))))
(run-setuphs "register" params)
;; The conf file is created only when there is a library to register.
(unless (file-exists? config-file)
(when (file-exists? config-file)
(mkdir-p config-dir)
(let* ((config-file-name+id
(call-with-ascii-input-file config-file (cut grep id-rx <>))))