use correct comment marker (dnl, not #)

add comment regarding AC_DECL_YYTEXT and the annoying warning
(just in case I'm not the only one who's annoyed by it)

diff --git a/acinclude.m4 b/acinclude.m4
index 8ddc6e39337ad67f20863711a7347bfed64f4046..ac2bf55563fc4df3648ee9a20a84638f1a8e24de 100644 (file)
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -2015,11 +2015,14 @@ dnl
 dnl Search for (f)lex and check it's version
 dnl
 AC_DEFUN([PHP_PROG_LEX], [
-  # we only support certain flex versions
+dnl we only support certain flex versions
   flex_version_list="2.5.4"
    
   AC_PROG_LEX
   if test -n "$LEX"; then
+dnl AC_DECL_YYTEXT is obsolete since autoconf 2.50 and merged into AC_PROG_LEX
+dnl this is what causes that annoying "PHP_PROG_LEX is expanded from" warning with autoconf 2.50+
+dnl it should be removed once we drop support of autoconf 2.13 (if ever)
     AC_DECL_YYTEXT
     :
   fi