--- foo/configure.in.org	2006-08-05 15:42:56.000000000 +0000
+++ foo/configure.in	2006-10-11 22:53:44.000000000 +0000
@@ -59,7 +59,7 @@
 dnl FIXME: How do we find the installed headers robustly?
 dnl
 AC_CHECK_HEADER(sphinxbase/sphinx_config.h,
-CPPFLAGS="-I/usr/include/sphinxbase -I/usr/local/include/sphinxbase",[
+CPPFLAGS="$CPPFLAGS",[
 if test x$sphinxbase = x; then
    # Look for sphinxbase in the parent directory
    for sb in ../sphinxbase*; do