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Remove this harmfull undefs introduced in flex-2.5.31
Alejandro

--- ./flex.skl.orig	2004-05-11 11:15:03.000000000 -0400
+++ ./flex.skl	2004-05-11 11:15:23.000000000 -0400
@@ -3277,10 +3277,8 @@
 %ok-for-header
 #undef YY_NEW_FILE
 #undef YY_FLUSH_BUFFER
-#undef yy_set_bol
 #undef yy_new_buffer
 #undef yy_set_interactive
-#undef yytext_ptr
 #undef YY_DO_BEFORE_ACTION
 
 #ifdef YY_DECL_IS_OURS