--- R-2.13.0/configure.ac~	2011-03-31 00:05:02.000000000 +0200
+++ R-2.13.0/configure.ac	2011-04-26 11:11:24.466666842 +0200
@@ -538,9 +538,9 @@
 AC_PATH_PROG(GETWD, pwd, pwd)
 AC_MSG_CHECKING([whether builddir is srcdir])
 if test "`cd \"${srcdir}\" && ${GETWD}`" = "`${GETWD}`"; then
-  BUILDDIR_IS_SRCDIR=yes
-else
   BUILDDIR_IS_SRCDIR=no
+else
+  BUILDDIR_IS_SRCDIR=yes
 fi
 AC_SUBST(BUILDDIR_IS_SRCDIR)
 AC_MSG_RESULT([${BUILDDIR_IS_SRCDIR}])