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-rw-r--r--libs/pbd/pbd/semutils.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/libs/pbd/pbd/semutils.h b/libs/pbd/pbd/semutils.h
index 6f5f0e9331..719a3d0f46 100644
--- a/libs/pbd/pbd/semutils.h
+++ b/libs/pbd/pbd/semutils.h
@@ -21,9 +21,11 @@
#include <semaphore.h>
+#include "pbd/libpbd_visibility.h"
+
namespace PBD {
-class ProcessSemaphore {
+class LIBPBD_API ProcessSemaphore {
private:
#ifdef __APPLE__
sem_t* _sem;