diff --git a/Makefile.config.in b/Makefile.config.in
index 20631935..847263f4 100644
--- a/Makefile.config.in
+++ b/Makefile.config.in
@@ -1,25 +1,20 @@
 # This is the automake's playground of our cool build system.
-# $Id$
 #
 # TODO: Make part of it autogenerated based on AC_SUBST() or something.
 
 SHELL = @SHELL@
 
-CURPATH = $(shell pwd)
-TOPPATH = $(shell cd $(top_builddir) && pwd)
-RELPATH = $(shell echo '$(CURPATH)' | sed 's,$(TOPPATH),,;s,^/,,;s,\([a-z0-9]\)$$,\1/,')
-
-PATHSCRIPT = case '@top_srcdir@' in /*) ;; *) echo $(top_builddir)/;; esac
-PATHPREFIX = $(shell $(PATHSCRIPT))
-
+TOPPATH    = $(shell cd $(top_builddir) && pwd)
+RELPATH    = $(subst $(TOPPATH)/,,$(CURDIR)/)
+PATHPREFIX = $(if $(patsubst /%,,@top_srcdir@),$(top_builddir)/)
 top_srcdir = $(PATHPREFIX)@top_srcdir@
 
-SRCPATH = $(shell cd $(top_srcdir)/$(RELPATH) && pwd)
-ifeq ($(SRCPATH),$(CURPATH))
-srcdir = 
+ifeq (@top_srcdir@,.)
+srcdir =
 else
 srcdir = $(top_srcdir)/$(RELPATH)
 endif
+
 prefix = @prefix@
 exec_prefix = @exec_prefix@