- rename configure.in to configure.ac
- change references from configure.in to configure.ac
diff --git a/README b/README
index 0ae8f10..8f230d3 100644
--- a/README
+++ b/README
@@ -241,7 +241,7 @@
 - NeXT
 - Irix 4 and --with-sgi-dl
 - Linux 1
-- Systems defining __d6_pthread_create (configure.in)
+- Systems defining __d6_pthread_create (configure.ac)
 - Systems defining PY_PTHREAD_D4, PY_PTHREAD_D6,
   or PY_PTHREAD_D7 in thread_pthread.h
 - Systems using --with-dl-dld
@@ -680,10 +680,10 @@
 threads to work properly.  Below is a table of those options,
 collected by Bill Janssen.  We would love to automate this process
 more, but the information below is not enough to write a patch for the
-configure.in file, so manual intervention is required.  If you patch
-the configure.in file and are confident that the patch works, please
+configure.ac file, so manual intervention is required.  If you patch
+the configure.ac file and are confident that the patch works, please
 send in the patch.  (Don't bother patching the configure script itself
--- it is regenerated each time the configure.in file changes.)
+-- it is regenerated each time the configure.ac file changes.)
 
 Compiler switches for threads
 .............................
@@ -1201,7 +1201,7 @@
 Tools/          Some useful programs written in Python
 pyconfig.h.in   Source from which pyconfig.h is created (GNU autoheader output)
 configure       Configuration shell script (GNU autoconf output)
-configure.in    Configuration specification (input for GNU autoconf)
+configure.ac    Configuration specification (input for GNU autoconf)
 install-sh      Shell script used to install files
 setup.py        Python script used to build extension modules