better support for tcl channels and string results

diff --git a/tclpkg/gv/gv_dummy_init.c b/tclpkg/gv/gv_dummy_init.c
new file mode 100644 (file)
index 0000000..096f2a9
--- /dev/null
+++ b/tclpkg/gv/gv_dummy_init.c
@@ -0,0 +1,4 @@
+#include <gvc.h>
+
+void gv_string_writer_init (GVC_t *gvc) {}
+void gv_channel_writer_init (GVC_t *gvc) {}