Index: support/apxs.in
--- support/apxs.in.orig
+++ support/apxs.in
@@ -681,8 +681,8 @@ __DATA__
 ##
 
 builddir=.
-top_srcdir=%PREFIX%
-top_builddir=%PREFIX%
+top_srcdir=%PREFIX%/share/apache2
+top_builddir=%PREFIX%/share/apache2
 include %INSTALLBUILDDIR%/special.mk
 
 #   the used tools