--- /Users/morrison/src/curl/configure.ac       2007-04-22 05:37:05.000000000 -0400
+++ configure.ac        2007-04-29 10:49:58.000000000 -0400
@@ -118,12 +118,16 @@
 dnl skip libtool C++ and Fortran compiler checks
 m4_ifdef([AC_PROG_CXX], [m4_undefine([AC_PROG_CXX])])
 m4_defun([AC_PROG_CXX],[])
+m4_ifdef([AC_PROG_CXXCPP], [m4_undefine([AC_PROG_CXXCPP])])
+m4_defun([AC_PROG_CXXCPP],[])
 m4_ifdef([AC_PROG_F77], [m4_undefine([AC_PROG_F77])])
 m4_defun([AC_PROG_F77],[])
 
 dnl skip libtool C++ and Fortran linker checks
 m4_ifdef([AC_LIBTOOL_CXX], [m4_undefine([AC_LIBTOOL_CXX])])
 m4_defun([AC_LIBTOOL_CXX],[])
+m4_ifdef([AC_LIBTOOL_CXXCPP], [m4_undefine([AC_LIBTOOL_CXXCPP])])
+m4_defun([AC_LIBTOOL_CXXCPP],[])
 m4_ifdef([AC_LIBTOOL_F77], [m4_undefine([AC_LIBTOOL_F77])])
 m4_defun([AC_LIBTOOL_F77],[])