1 files changed, 1 insertions, 0 deletions
diff --git a/dln.h b/dln.h
index 25cd946acf..26df5266f7 100644
--- a/dln.h
+++ b/dln.h
@@ -22,6 +22,7 @@ RUBY_SYMBOL_EXPORT_BEGIN
 #define DLN_FIND_EXTRA_ARG_DECL
 #endif
 
+bool dln_supported_p(void);
 char *dln_find_exe_r(const char*,const char*,char*,size_t DLN_FIND_EXTRA_ARG_DECL);
 char *dln_find_file_r(const char*,const char*,char*,size_t DLN_FIND_EXTRA_ARG_DECL);
 void *dln_load(const char*);