some build environment updates

ax_init_standard_project.m4

@@ -5,17 +5,17 @@
 
 # define least version number from subversion's revision number:
 # it is taken modulo 256 due to a bug on Apple's MacOSX
-m4_define(x_least, m4_esyscmd_s(
-  LEAST="ERROR-UNDEFINED-REVISION-to-be-built-in-subdirectory-of-svn-checkout"
+m4_define(x_version, m4_esyscmd_s(
+  SVN_REVISION="ERROR-UNDEFINED-REVISION-to-be-built-in-subdirectory-of-svn-checkout"
   for path in . .. ../..; do
     if svn info $path 2>&1 > /dev/null; then
-      # Mac does not support LEAST > 255
-      LEAST=$(($(LANG= svn info $path | sed -n 's/Last Changed Rev: //p')%256))
+      SVN_REVISION=$(LANG= svn info $path | sed -n 's/Last Changed Rev: //p')
       (cd $path && svn2cl)
       break;
     fi
   done
-  echo $ECHO_N $LEAST
+  # Mac does not support LEAST > 255
+  echo $ECHO_N x_major.$((x_minor+$SVN_REVISION/256)).$(($SVN_REVISION%256))
 ))
 
 ## bugreport mail address is taken from <user@host> in first line of AUTHORS