rename configure.in to configure.ac

Autoconf has been deprecating configure.in for quite a long time.
Rename all our configure.in and preconfigure.in files to .ac.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/ports/README b/ports/README
index d16b0f0f51..2c73b1e803 100644
--- a/ports/README
+++ b/ports/README
@@ -24,7 +24,7 @@ rather than the generic ones here.
 The real source code for any ports is found in the sysdeps/ subdirectories.
 These should be exactly what would go into the main libc source tree if you
 were to incorporate it directly.  The only exceptions are the files
-sysdeps/*/preconfigure and sysdeps/*/preconfigure.in; these are fragments
+sysdeps/*/preconfigure and sysdeps/*/preconfigure.ac; these are fragments
 used by this add-on's configure fragment.  The purpose of these is to set
 $base_machine et al when the main libc configure's defaults are not right
 for some machine.  Everything else can and should be done from a normal
@@ -32,7 +32,7 @@ sysdeps/.../configure fragment that is used only when the configuration
 selects that sysdeps subdirectory.  Each port that requires some special
 treatment before the sysdeps directory list is calculated, should add a
 sysdeps/CPU/preconfigure file; this can either be written by hand or
-generated by Autoconf from sysdeps/CPU/preconfigure.in, and follow the
+generated by Autoconf from sysdeps/CPU/preconfigure.ac, and follow the
 rules for glibc add-on configure fragments.  No preconfigure file should do
 anything on an unrelated configuration, so that disparate ports can be put
 into a single add-on without interfering with each other.