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diff --git a/config/ac_create_prefix_config_h.m4 b/config/ac_create_prefix_config_h.m4
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+++ b/config/ac_create_prefix_config_h.m4
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+dnl @synopsis AC_CREATE_PREFIX_CONFIG_H [(OUTPUT-HEADER [,PREFIX [,ORIG-HEADER]])]
+dnl
+dnl this is a new variant from ac_prefix_config_
+dnl   this one will use a lowercase-prefix if
+dnl   the config-define was starting with a lowercase-char, e.g. 
+dnl   #define const or #define restrict or #define off_t
+dnl   (and this one can live in another directory, e.g. testpkg/config.h
+dnl    therefore I decided to move the output-header to be the first arg)
+dnl
+dnl takes the usual config.h generated header file; looks for each of
+dnl the generated "#define SOMEDEF" lines, and prefixes the defined name
+dnl (ie. makes it "#define PREFIX_SOMEDEF". The result is written to
+dnl the output config.header file. The PREFIX is converted to uppercase 
+dnl for the conversions. 
+dnl
+dnl default OUTPUT-HEADER = $PACKAGE-config.h
+dnl default PREFIX = $PACKAGE
+dnl default ORIG-HEADER, derived from OUTPUT-HEADER
+dnl         if OUTPUT-HEADER has a "/", use the basename
+dnl         if OUTPUT-HEADER has a "-", use the section after it.
+dnl         otherwise, just config.h
+dnl
+dnl In most cases, the configure.in will contain a line saying
+dnl         AC_CONFIG_HEADER(config.h) 
+dnl somewhere *before* AC_OUTPUT and a simple line saying
+dnl        AC_PREFIX_CONFIG_HEADER
+dnl somewhere *after* AC_OUTPUT.
+dnl
+dnl example:
+dnl   AC_INIT(config.h.in)        # config.h.in as created by "autoheader"
+dnl   AM_INIT_AUTOMAKE(testpkg, 0.1.1)   # "#undef VERSION" and "PACKAGE"
+dnl   AM_CONFIG_HEADER(config.h)         #                in config.h.in
+dnl   AC_MEMORY_H                        # "#undef NEED_MEMORY_H"
+dnl   AC_C_CONST_H                       # "#undef const"
+dnl   AC_OUTPUT(Makefile)                # creates the "config.h" now
+dnl   AC_CREATE_PREFIX_CONFIG_H          # creates "testpkg-config.h"
+dnl         and the resulting "testpkg-config.h" contains lines like
+dnl   #ifndef TESTPKG_VERSION 
+dnl   #define TESTPKG_VERSION "0.1.1"
+dnl   #endif
+dnl   #ifndef TESTPKG_NEED_MEMORY_H 
+dnl   #define TESTPKG_NEED_MEMORY_H 1
+dnl   #endif
+dnl   #ifndef _testpkg_const 
+dnl   #define _testpkg_const const
+dnl   #endif
+dnl
+dnl   and this "testpkg-config.h" can be installed along with other
+dnl   header-files, which is most convenient when creating a shared
+dnl   library (that has some headers) where some functionality is
+dnl   dependent on the OS-features detected at compile-time. No
+dnl   need to invent some "testpkg-confdefs.h.in" manually. :-)
+dnl
+dnl @version $Id$
+dnl @author Guido Draheim <guidod@gmx.de>
+
+AC_DEFUN([AC_CREATE_PREFIX_CONFIG_H],
+[changequote({, })dnl 
+ac_prefix_conf_OUT=`echo ifelse($1, , $PACKAGE-config.h, $1)`
+ac_prefix_conf_DEF=`echo _$ac_prefix_conf_OUT | sed -e 'y:abcdefghijklmnopqrstuvwxyz./,-:ABCDEFGHIJKLMNOPQRSTUVWXYZ____:'`
+ac_prefix_conf_PKG=`echo ifelse($2, , $PACKAGE, $2)`
+ac_prefix_conf_LOW=`echo _$ac_prefix_conf_PKG | sed -e 'y:ABCDEFGHIJKLMNOPQRSTUVWXYZ-:abcdefghijklmnopqrstuvwxyz_:'`
+ac_prefix_conf_UPP=`echo $ac_prefix_conf_PKG | sed -e 'y:abcdefghijklmnopqrstuvwxyz-:ABCDEFGHIJKLMNOPQRSTUVWXYZ_:'  -e '/^[0-9]/s/^/_/'`
+ac_prefix_conf_INP=`echo ifelse($3, , _, $3)`
+if test "$ac_prefix_conf_INP" = "_"; then
+   case $ac_prefix_conf_OUT in
+      */*) ac_prefix_conf_INP=`basename $ac_prefix_conf_OUT` 
+      ;;
+      *-*) ac_prefix_conf_INP=`echo $ac_prefix_conf_OUT | sed -e 's/[a-zA-Z0-9_]*-//'`
+      ;;
+      *) ac_prefix_conf_INP=config.h
+      ;;
+   esac
+fi
+changequote([, ])dnl
+if test -z "$ac_prefix_conf_PKG" ; then
+   AC_MSG_ERROR([no prefix for _PREFIX_PKG_CONFIG_H])
+else
+  AC_MSG_RESULT(creating $ac_prefix_conf_OUT - prefix $ac_prefix_conf_UPP for $ac_prefix_conf_INP defines)
+  if test -f $ac_prefix_conf_INP ; then
+    AS_DIRNAME([/* automatically generated */], $ac_prefix_conf_OUT)
+changequote({, })dnl 
+    echo '#ifndef '$ac_prefix_conf_DEF >$ac_prefix_conf_OUT
+    echo '#define '$ac_prefix_conf_DEF' 1' >>$ac_prefix_conf_OUT
+    echo ' ' >>$ac_prefix_conf_OUT
+    echo /'*' $ac_prefix_conf_OUT. Generated automatically at end of configure. '*'/ >>$ac_prefix_conf_OUT
+
+    echo 's/#undef  *\([A-Z_]\)/#undef '$ac_prefix_conf_UPP'_\1/' >conftest.sed
+    echo 's/#undef  *\([a-z]\)/#undef '$ac_prefix_conf_LOW'_\1/' >>conftest.sed
+    echo 's/#define  *\([A-Z_][A-Za-z0-9_]*\)\(.*\)/#ifndef '$ac_prefix_conf_UPP"_\\1 \\" >>conftest.sed
+    echo '#define '$ac_prefix_conf_UPP"_\\1 \\2 \\" >>conftest.sed
+    echo '#endif/' >>conftest.sed
+    echo 's/#define  *\([a-z][A-Za-z0-9_]*\)\(.*\)/#ifndef '$ac_prefix_conf_LOW"_\\1 \\" >>conftest.sed
+    echo '#define '$ac_prefix_conf_LOW"_\\1 \\2 \\" >>conftest.sed
+    echo '#endif/' >>conftest.sed
+    sed -f conftest.sed $ac_prefix_conf_INP >>$ac_prefix_conf_OUT
+    echo ' ' >>$ac_prefix_conf_OUT
+    echo '/*' $ac_prefix_conf_DEF '*/' >>$ac_prefix_conf_OUT
+    echo '#endif' >>$ac_prefix_conf_OUT
+changequote([, ])dnl
+  else
+    AC_MSG_ERROR([input file $ac_prefix_conf_IN does not exist, dnl
+    skip generating $ac_prefix_conf_OUT])
+  fi
+  rm -f conftest.* 
+fi])
+