Musl is stricter
--- spa/include/spa/param/meta.h
+++ spa/include/spa/param/meta.h
@@ -24,6 +24,7 @@
extern "C" {
#endif
+#include <fcntl.h> /* for off_t */
#include <spa/utils/defs.h>
#include <spa/param/param.h>
#include <spa/support/type-map.h>