2 files changed, 3 insertions, 1 deletions
diff --git a/src/gram.y b/src/gram.y
index 9de5935..cf46d35 100644
--- a/src/gram.y
+++ b/src/gram.y
@@ -100,7 +100,6 @@ static int color;
 int mods = 0;
 unsigned int mods_used = (ShiftMask | ControlMask | Mod1Mask);
 
-extern int yylineno;
 extern int yylex(void);
 static void yyerror(const char *s);
 
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)))