Rename configure.in to configure.ac

Rename configure.in to configure.ac and update references to the
file. Configure.ac is the recomended and promoted name in the autoconf
manual.

INSTALL

@@ -421,6 +421,6 @@ Makefile(s), the header file containing system-dependent definitions
 (if the package uses one), and `config.status' (all the files that
 `configure' created), type `make distclean'.
 
-The file `configure.in' is used as a template to create `configure' by
+The file `configure.ac' is used as a template to create `configure' by
 a program called `autoconf'.  You will only need it if you want to
 regenerate `configure' using a newer version of `autoconf'.

configure.in → configure.ac

@@ -1848,7 +1848,7 @@ AC_CONFIG_COMMANDS([libgimpbase/gimpversion.h], [
   cat > $outfile <<\_______EOF
 /* gimpversion.h
  *
- * This is a generated file.  Please modify 'configure.in'
+ * This is a generated file.  Please modify 'configure.ac'
  */
 
 #ifndef __GIMP_VERSION_H__

devel-docs/release-howto.txt

@@ -16,7 +16,7 @@
 
  ( ) Make sure the checkout is up to date, clean from uncommitted changes.
 
- ( ) Check that the version number is correct in configure.in
+ ( ) Check that the version number is correct in configure.ac
 
  ( ) Run 'make maintainer-clean -k'
 
@@ -69,7 +69,7 @@
      downloads/index.htrw.  Commit this change, the web server should
      then update itself soon (usually less than an hour).
 
- ( ) Bump the version number in configure.in and commit this change.
+ ( ) Bump the version number in configure.ac and commit this change.
 
  ( ) Grab a properly chilled beverage and enjoy yourself.
 

menus/Makefile.am

@@ -52,7 +52,7 @@ if GIMP_UNSTABLE
 DEBUG_MENU_PARAMS = --stringparam debug-menu yes
 endif
 
-%.xml: %.xml.in $(top_srcdir)/configure.in $(srcdir)/menus.xsl dialogs-menuitems.xml
+%.xml: %.xml.in $(top_srcdir)/configure.ac $(srcdir)/menus.xsl dialogs-menuitems.xml
 if HAVE_XSLTPROC
 	$(XSLTPROC) --xinclude $(DEBUG_MENU_PARAMS) $(srcdir)/menus.xsl $< > $(@) || rm -f $(@)
 else

plug-ins/imagemap/Makefile.am

@@ -146,7 +146,7 @@ CLEANFILES = y.tab.c y.tab.h
 ## The following rules are not necessary for most users.  They are
 ## only used by the maintainers who modify the symbols and grammar
 ## that are used for parsing the map files.  These rules are very
-## specific and a test for flex and bison in configure.in would not be
+## specific and a test for flex and bison in configure.ac would not be
 ## appropriate in most cases, so the Makefile rules are included here.
 ## In addition, the default rules provided by automake would not be
 ## sufficient because the source and target files have different base

plug-ins/pygimp/INSTALL

@@ -245,6 +245,6 @@ Makefile(s), the header file containing system-dependent definitions
 (if the package uses one), and `config.status' (all the files that
 `configure' created), type `make distclean'.
 
-The file `configure.in' is used as a template to create `configure' by
+The file `configure.ac' is used as a template to create `configure' by
 a program called `autoconf'.  You will only need it if you want to
 regenerate `configure' using a newer version of `autoconf'.