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diff --git a/rt/m4/rt_layout.m4 b/rt/m4/rt_layout.m4
new file mode 100644
index 000000000..393b32175
--- /dev/null
+++ b/rt/m4/rt_layout.m4
@@ -0,0 +1,74 @@
+dnl
+dnl @synopsis RT_LAYOUT(configlayout, layoutname)
+dnl
+dnl This macro reads an Apache-style layout file (specified as the
+dnl configlayout parameter), and searches for a specific layout
+dnl (named using the layoutname parameter).
+dnl
+dnl The entries for a given layout are then inserted into the
+dnl environment such that they become available as substitution
+dnl variables. In addition, the rt_layout_name variable is set
+dnl (but not exported) if the layout is valid.
+dnl
+dnl This code is heavily borrowed *cough* from the Apache 2 codebase.
+dnl
+
+AC_DEFUN([RT_LAYOUT],[
+	if test ! -f $srcdir/config.layout; then
+		AC_MSG_WARN([Layout file $srcdir/config.layout not found])
+		rt_layout_name=no
+	else
+		pldconf=./config.pld
+		$PERL  -0777 -p -e "\$layout = '$2';"  -e '
+		s/.*<Layout\s+$layout>//gims; 
+		s/\<\/Layout\>.*//s; 
+		s/^#.*$//m;
+		s/^\s+//gim;
+		s/\s+$/\n/gim;
+		s/\+$/\/rt3/gim;
+		# m4 will not let us just use $1, we need @S|@1
+		s/^\s*((?:bin|sbin|libexec|data|sysconf|sharedstate|localstate|lib|include|oldinclude|info|man)dir)\s*:\s*(.*)$/@S|@1=@S|@2/gim;
+		s/^\s*(.*?)\s*:\s*(.*)$/\(test "x\@S|@@S|@1" = "xNONE" || test "x\@S|@@S|@1" = "x") && @S|@1=@S|@2/gim;
+		 ' < $1 > $pldconf
+
+		if test -s $pldconf; then
+			rt_layout_name=$2
+			. $pldconf
+			changequote({,})
+			for var in prefix exec_prefix bindir sbindir \
+				 sysconfdir mandir libdir datadir htmldir \
+				 localstatedir logfiledir masonstatedir \
+				 sessionstatedir customdir custometcdir customhtmldir \
+				 customlexdir customlibdir manualdir; do
+				eval "val=\"\$$var\""
+				val=`echo $val | sed -e 's:\(.\)/*$:\1:'`
+				val=`echo $val | 
+					sed -e 's:[\$]\([a-z_]*\):${\1}:g'`
+				eval "$var='$val'"
+			done
+			changequote([,])
+		else
+			rt_layout_name=no
+		fi
+		#rm $pldconf
+	fi
+	RT_SUBST_EXPANDED_ARG(prefix)
+	RT_SUBST_EXPANDED_ARG(exec_prefix)
+	RT_SUBST_EXPANDED_ARG(bindir)
+	RT_SUBST_EXPANDED_ARG(sbindir)
+	RT_SUBST_EXPANDED_ARG(sysconfdir)
+	RT_SUBST_EXPANDED_ARG(mandir)
+	RT_SUBST_EXPANDED_ARG(libdir)
+	RT_SUBST_EXPANDED_ARG(datadir)
+	RT_SUBST_EXPANDED_ARG(htmldir)
+	RT_SUBST_EXPANDED_ARG(manualdir)
+	RT_SUBST_EXPANDED_ARG(localstatedir)
+	RT_SUBST_EXPANDED_ARG(logfiledir)
+	RT_SUBST_EXPANDED_ARG(masonstatedir)
+	RT_SUBST_EXPANDED_ARG(sessionstatedir)
+	RT_SUBST_EXPANDED_ARG(customdir)
+	RT_SUBST_EXPANDED_ARG(custometcdir)
+	RT_SUBST_EXPANDED_ARG(customhtmldir)
+	RT_SUBST_EXPANDED_ARG(customlexdir)
+	RT_SUBST_EXPANDED_ARG(customlibdir)
+])dnl