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-rw-r--r--gnu/packages/haskell.scm8
1 files changed, 5 insertions, 3 deletions
diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index 39c0c0a4cd..c302ae8308 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -283,9 +283,11 @@ 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"))
 
@@ -1823,7 +1825,7 @@ bindings are a direct translation of the C bindings.")
        ("ghc-utf8-string" ,ghc-utf8-string)
        ("libx11" ,libx11)
        ("libxft" ,libxft)
-       ("xproto" ,xproto)))
+       ("xorgproto" ,xorgproto)))
     (native-inputs
      `(("pkg-config" ,pkg-config)))
     (build-system haskell-build-system)