c3-lang/libtommath

diff --git a/demo/shared.h b/demo/shared.h
index 7be8e86..7a7b88f 100644
--- a/demo/shared.h
+++ b/demo/shared.h
@@ -25,4 +25,4 @@
 
 #include "tommath.h"
 
-void ndraw(mp_int*, const char*);
+extern void ndraw(mp_int* a, const char* name);