It seems that the configure file on the default branch has been generated with
autoconf 2.70. Autoconf 2.70 has not yet been released [1].  The differences
between the generated configure files with 2.69 and 2.70 are a few lines [3]
added by 2.70 with 'runstatedir' in them.  The last old discussion on the
usage of different autoconf versions [2] does not really answer the following
question:

I am using 2.69, should a commit that changes configure.ac respects the
existing 'runstatedir' lines added by a previous commit or uses directly the
configure file generated by 2.69 ?

Xavier

[1] http://thread.gmane.org/gmane.comp.sysutils.autoconf.general/16193
[2] http://thread.gmane.org/gmane.comp.python.devel/135327
[3] diff -r fe168c2b5e95 configure
--- a/configure Wed Jul 06 23:58:16 2016 -0700
+++ b/configure Fri Jul 22 14:49:31 2016 +0200
@@ -777,7 +777,6 @@
 docdir
 oldincludedir
 includedir
-runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -888,7 +887,6 @@
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
-runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1141,15 +1139,6 @@
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;

-  -runstatedir | --runstatedir | --runstatedi | --runstated \
-  | --runstate | --runstat | --runsta | --runst | --runs \
-  | --run | --ru | --r)
-    ac_prev=runstatedir ;;
-  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
-  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
-  | --run=* | --ru=* | --r=*)
-    runstatedir=$ac_optarg ;;
-
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1287,7 +1276,7 @@
 for ac_var in  exec_prefix prefix bindir sbindir libexecdir datarootdir \
                datadir sysconfdir sharedstatedir localstatedir includedir \
                oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-               libdir localedir mandir runstatedir
+               libdir localedir mandir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1440,7 +1429,6 @@
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
-  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]


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