cgraph: [nfc] align storage-class declarations to Graphviz standard in agxbuf.h

diff --git a/lib/cgraph/agxbuf.h b/lib/cgraph/agxbuf.h
index 1b4538d4c130478310c3a56602deb41ec1703cab..1d098a7c43fff87f2c79d096a9707014c021de5d 100644 (file)
--- a/lib/cgraph/agxbuf.h
+++ b/lib/cgraph/agxbuf.h
@@ -24,7 +24,9 @@ extern "C" {
 #else
 #define AGXBUF_API __declspec(dllimport)
 #endif
-#else
+#endif
+
+#ifndef AGXBUF_API
 #define AGXBUF_API /* nothing */
 #endif