Build flex 2.5.11.

sysa/flex-2.5.11/patches/flexdef.patch

@@ -0,0 +1,24 @@
+diff --git flexdef.h flexdef.h
+index 3eb710a..94ef024 100644
+--- flexdef.h
++++ flexdef.h
+@@ -421,7 +421,7 @@ extern int yymore_really_used, reject_really_used;
+  */
+ 
+ extern int datapos, dataline, linenum, out_linenum;
+-extern FILE *skelfile, *yyin, *backing_up_file;
++extern FILE *skelfile, *backing_up_file;
+ extern const char *skel[];
+ extern int skel_ind;
+ extern char *infilename, *outfilename, *headerfilename;
+@@ -432,6 +432,10 @@ extern char **input_files;
+ extern int num_input_files;
+ extern char *program_name;
+ 
++#ifndef yyin_defined
++extern FILE* yyin;
++#endif
++
+ extern char *action_array;
+ extern int action_size;
+ extern int defs1_offset, prolog_offset, action_offset, action_index;

sysa/flex-2.5.11/patches/scan_l.patch

@@ -0,0 +1,36 @@
+diff --git scan.l scan.l
+index 18d0de8..c251a5e 100644
+--- scan.l
++++ scan.l
+@@ -32,6 +32,7 @@
+ /*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
+ /*  PURPOSE. */
+ 
++#define yyin_defined
+ #include "flexdef.h"
+ #include "parse.h"
+ 
+@@ -334,8 +335,8 @@ LEXOPT		[aceknopr]
+ 
+ 
+ <SECT2PROLOG>{
+-	^"%{".*	++bracelevel; yyless( 2 );	/* eat only %{ */
+-	^"%}".*	--bracelevel; yyless( 2 );	/* eat only %} */
++	^"%{".*	++bracelevel; yyless( 2 );
++	^"%}".*	--bracelevel; yyless( 2 );
+ 
+ 	^{WS}.*	ACTION_ECHO;	/* indented code in prolog */
+ 
+@@ -480,11 +481,11 @@ LEXOPT		[aceknopr]
+ 				}
+ 			}
+ 
++	"{"{NAME}"}"[[:space:]]?	 {
+     /* Check for :space: at the end of the rule so we don't
+      * wrap the expanded regex in '(' ')' -- breaking trailing
+      * context.
+      */
+-	"{"{NAME}"}"[[:space:]]?	 {
+ 			register Char *nmdefptr;
+             int end_is_ws, end_ch;
+