diff --git a/.gitattributes b/.gitattributes
index a5054ef..8f791ee 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -10,7 +10,7 @@ freeglut/freeglut/README svn_keywords=Author+Date+Id+Revision
 freeglut/freeglut/TODO svn_keywords=Author+Date+Id+Revision
 freeglut/freeglut/acconfig.h svn_keywords=Author+Date+Id+Revision
 freeglut/freeglut/autogen.sh svn_keywords=Author+Date+Id+Revision
-freeglut/freeglut/configure.in svn_keywords=Author+Date+Id+Revision
+freeglut/freeglut/configure.ac svn_keywords=Author+Date+Id+Revision
 freeglut/freeglut/doc/.cvsignore svn_keywords=Author+Date+Id+Revision
 freeglut/freeglut/doc/Makefile.am svn_keywords=Author+Date+Id+Revision
 freeglut/freeglut/doc/download.html svn_keywords=Author+Date+Id+Revision
diff --git a/freeglut/freeglut/ChangeLog b/freeglut/freeglut/ChangeLog
index d7fa247..3ce0350 100644
--- a/freeglut/freeglut/ChangeLog
+++ b/freeglut/freeglut/ChangeLog
@@ -719,3 +719,6 @@ caught. This makes sense and is more compatible with GLUT.
 
 (190) Added eMbedded Visual Tools project/workspace files to
 distribution.
+
+(191) Renamed "configure.in" to the officially preferred
+"configure.ac".
diff --git a/freeglut/freeglut/INSTALL b/freeglut/freeglut/INSTALL
index 02a4a07..1966f09 100644
--- a/freeglut/freeglut/INSTALL
+++ b/freeglut/freeglut/INSTALL
@@ -19,8 +19,8 @@ diffs or instructions to the address given in the `README' so they can
 be considered for the next release.  If at some point `config.cache'
 contains results you don't want to keep, you may remove or edit it.
 
-   The file `configure.in' is used to create `configure' by a program
-called `autoconf'.  You only need `configure.in' if you want to change
+   The file `configure.ac' is used to create `configure' by a program
+called `autoconf'.  You only need `configure.ac' if you want to change
 it or regenerate `configure' using a newer version of `autoconf'.
 
 The simplest way to compile this package is:
diff --git a/freeglut/freeglut/configure.in b/freeglut/freeglut/configure.ac
similarity index 100%
rename from freeglut/freeglut/configure.in
rename to freeglut/freeglut/configure.ac