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-rw-r--r--gnu/packages/haskell.scm6
1 files changed, 4 insertions, 2 deletions
diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index c5408f8627..4b1e3f23b8 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -282,9 +282,11 @@ top of CLISP.")
(mkdir-p libtinfo-dir)
(symlink
(string-append ncurses-lib "/libncursesw.so."
- ;; Extract "6.0" from "6.0-20170930".
+ ;; Extract "6.0" from "6.0-20170930" if a
+ ;; dash-separated version tag exists.
,(let* ((v (package-version ncurses))
- (d (string-index v #\-)))
+ (d (or (string-index v #\-)
+ (string-length v))))
(version-major+minor (string-take v d))))
(string-append libtinfo-dir "/libtinfo.so.5"))