diff --git a/configure.in b/configure.in
index 5a53aab..eeab200 100644
--- a/configure.in
+++ b/configure.in
@@ -221,7 +221,7 @@
 # case we give a warning if no ext is given
 AC_SUBST(BUILDEXEEXT)
 AC_MSG_CHECKING(for case-insensitive build directory)
-if test -d "python"
+if test -d "${srcdir}/python"
 then
     AC_MSG_RESULT(yes)
     BUILDEXEEXT=.exe
@@ -2316,7 +2316,7 @@
 done
 
 AC_SUBST(SRCDIRS)
-SRCDIRS="Parser Grammar Objects Python Modules"
+SRCDIRS="Parser Grammar Objects Python Modules Mac Mac/Python"
 AC_MSG_CHECKING(for build directories)
 for dir in $SRCDIRS; do
     if test ! -d $dir; then