Merge branch 'master' into core-updates

1 files changed, 11 insertions, 0 deletions

diff --git a/guix/build/haskell-build-system.scm b/guix/build/haskell-build-system.scm
index 34e5247e07..8e2aee381d 100644
--- a/guix/build/haskell-build-system.scm
+++ b/guix/build/haskell-build-system.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2015 Federico Beffa <beffa@fbengineering.ch>
 ;;; Copyright © 2015 Eric Bavier <bavier@member.fsf.org>
+;;; Copyright © 2015 Paul van der Walt <paul@denknerd.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -102,7 +103,17 @@ and parameters ~s~%"
     ;; Cabal errors if GHC_PACKAGE_PATH is set during 'configure', so unset
     ;; and restore it.
     (unsetenv "GHC_PACKAGE_PATH")
+
+    ;; For packages where the Cabal build-type is set to "Configure",
+    ;; ./configure will be executed.  In these cases, the following
+    ;; environment variable is needed to be able to find the shell executable.
+    ;; For other package types, the configure script isn't present.  For more
+    ;; information, see the Build Information section of
+    ;; <https://www.haskell.org/cabal/users-guide/developing-packages.html>.
+    (when (file-exists? "configure")
+      (setenv "CONFIG_SHELL" "sh"))
     (run-setuphs "configure" params)
+
     (setenv "GHC_PACKAGE_PATH" ghc-path)))
 
 (define* (build #:rest empty)