--- configure.in.orig	2007-01-11 00:51:59.000000000 +0200
+++ configure.in	2007-08-21 09:22:58.000000000 +0200
@@ -1946,7 +1948,7 @@
   dnl Default is PHP3, and if ZEND_API is set then we assume that we have PHP4.
   dnl
   AC_MSG_CHECKING([whether we have PHP3 or PHP4])
-  if test -n "`grep 'ZEND_API' $PHP_CONFIG_H`"  ; then
+  if test -n "`cpp -dD $PHP_CONFIG_H|grep 'ZEND_API'`"  ; then
     PHP_VERSION_FLAG="-DPHP4"
   else
     PHP_VERSION_FLAG="-DPHP3"