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diff --git a/tests/prefix_r.l b/tests/prefix_r.l
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+/*
+ * This file is part of flex.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
+ */
+
+%{
+/* Builds "scanner.c". */
+/* The scanner itself is a no-op. A successful compilation is all we want. */
+#include <stdio.h>
+#include <stdlib.h>
+#include "config.h"
+
+%}
+%option reentrant
+%option 8bit prefix="FOO"
+%option nounput nomain noyywrap noinput
+%option warn
+
+
+%%
+
+
+.|\n|\r  { 
+
+    /* Compile, but do not execute the following code. */
+    if( 0 ) {
+        FOO_create_buffer( (FILE*)0, 0, yyscanner);
+        FOO_delete_buffer( (YY_BUFFER_STATE)0, yyscanner);
+        FOO_flush_buffer( (YY_BUFFER_STATE)0, yyscanner);
+        FOO_init_buffer( (YY_BUFFER_STATE)0, (FILE*)0, yyscanner);
+        FOO_load_buffer_state( yyscanner);
+        FOO_scan_buffer( (char*)0, (yy_size_t)0, yyscanner);
+        FOO_scan_bytes( (yyconst char*)0, 0, yyscanner);
+        FOO_scan_string( (yyconst char*)0, yyscanner);
+        FOO_switch_to_buffer( (YY_BUFFER_STATE)0, yyscanner);
+        FOOrestart( (FILE*)0, (yyscan_t )0);
+
+        FOOget_extra( (yyscan_t )0 );
+        FOOget_in( (yyscan_t )0 );
+        FOOget_leng( (yyscan_t )0 );
+        FOOget_out( (yyscan_t )0 );
+        FOOget_text( (yyscan_t )0 );
+        FOOlex( (yyscan_t )0 );
+        FOOlex_destroy( (yyscan_t )0 );
+        FOOlex_init( (yyscan_t *)0 );
+        FOOset_extra( (void *)0, (yyscan_t )0 );
+        FOOset_in( (FILE*)0, (yyscan_t )0 );
+        FOOset_out( (FILE*)0, (yyscan_t )0 );
+    }
+  }
+%%
+
+int main(void);
+
+int
+main ()
+{
+    yyscan_t  scanner;
+    FOOlex_init( &scanner);
+    FOOlex( scanner);
+    FOOlex_destroy( scanner);
+    printf( "TEST RETURNING OK.\n");
+    return 0;
+}
+