1 files changed, 3 insertions, 0 deletions
diff --git a/src/lex.l b/src/lex.l
index 8bb5d19..2d6ef0c 100644
--- a/src/lex.l
+++ b/src/lex.l
@@ -70,6 +70,9 @@ in this Software without prior written authorization from The Open Group.
 #include "parse.h"
 
 #ifdef FLEX_SCANNER
+#if (YY_FLEX_MINOR_VERSION == 5) && (YY_FLEX_SUBMINOR_VERSION < 20)
+int yylineno;
+#endif
 
 #undef YY_INPUT
 #define YY_INPUT(buf,result,size) ((result) = doinput((buf),(size)))