Tweak Automake to always build the project before rolling a tar-ball.
This should fix issue 1468520.

diff -r 3e3c4e11d6dc Makefile.am
--- a/Makefile.am	Sun Jun 28 16:01:34 2015 +0200
+++ b/Makefile.am	Sun Jun 28 16:03:16 2015 +0200
@@ -10,3 +10,12 @@
 DIST_SUBDIRS = share src doc
 
 ACLOCAL_AMFLAGS = -I m4
+
+
+# This is just the original rule, which autoconf-2.69 generates for
+# the `dist' / `dist-all' target with the extra dependency on `all'.
+# This ensures that the project was built before we start to roll the
+# distribution tar-ball.
+dist dist-all: all
+	$(MAKE) $(AM_MAKEFLAGS) $(DIST_TARGETS) am__post_remove_distdir='@:'
+	$(am__post_remove_distdir)