build: Compile stackage only if 'guile-json' is available.

Fixes <http://bugs.gnu.org/26860>.
This is a followup to commit 3089b5d3f5a31b191b68ce3aa9255b646940b642.

* Makefile.am (MODULES): Move "guix/scripts/import/stackage.scm" within
'if HAVE_GUILE_JSON'.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

diff --git a/Makefile.am b/Makefile.am
index e1c7cdd..b90f419 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -160,7 +160,6 @@ MODULES =                                   \
   guix/scripts/import/gnu.scm                  \
   guix/scripts/import/nix.scm                  \
   guix/scripts/import/hackage.scm              \
-  guix/scripts/import/stackage.scm             \
   guix/scripts/import/elpa.scm                 \
   guix/scripts/environment.scm                 \
   guix/scripts/publish.scm                     \
@@ -185,7 +184,8 @@ MODULES +=                                  \
   guix/import/stackage.scm                     \
   guix/scripts/import/crate.scm                        \
   guix/scripts/import/gem.scm                  \
-  guix/scripts/import/pypi.scm
+  guix/scripts/import/pypi.scm                 \
+  guix/scripts/import/stackage.scm
 
 endif