1 files changed, 2 insertions, 0 deletions
diff --git a/src/bltGrPen.h b/src/bltGrPen.h
index 2a7c2bf..21cb2a2 100644
--- a/src/bltGrPen.h
+++ b/src/bltGrPen.h
@@ -35,6 +35,8 @@
 #include <iomanip>
 using namespace std;
 
+#include <tk.h>
+
 #include "bltText.h"
 
 class Graph;