-AC_INIT([The Glorious Glasgow Haskell Compilation System], [6.5], [glasgow-haskell-bugs@haskell.org], [ghc])
+AC_INIT([The Glorious Glasgow Haskell Compilation System], [6.7], [glasgow-haskell-bugs@haskell.org], [ghc])
+
+# Set this to YES for a released version, otherwise NO
+: ${RELEASE=NO}
+
+# The primary version (e.g. 6.7, 6.6.1) is set in the AC_INIT line
+# above. If this is not a released version, then we will append the
+# date to the version number (e.g. 6.7.20070204). The date is
+# constructed by finding the date of the most recent patch in the
+# darcs repository. If this is a source distribution (not a darcs
+# checkout), then we ship a file 'VERSION' containing the full version
+# when the source distribution was created.
+
+if test ! -f mk/config.h.in; then
+ echo "mk/config.h.in doesn't exist: perhaps you haven't run 'autoreconf'?"
+ exit 1
+fi