skip libtool C++ and Fortran checks

configure.ac

@@ -17,6 +17,7 @@ solaris*)
 	;;
 esac
 
+dnl support building of Windows DLLs
 AC_LIBTOOL_WIN32_DLL
 
 dnl ************************************************************
@@ -62,8 +63,13 @@ AC_HELP_STRING([--disable-debug],[Disable debug options]),
        AC_MSG_RESULT(no)
 )
 
+dnl skip libtool C++ and Fortran checks
+m4_undefine([AC_PROG_CXX])
+m4_defun([AC_PROG_CXX],[])
+m4_undefine([AC_PROG_F77])
+m4_defun([AC_PROG_F77],[])
+
 dnl libtool setup
-CARES_CLEAR_LIBTOOL_TAGS
 AC_PROG_LIBTOOL
 
 AC_MSG_CHECKING([if we need -no-undefined])