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-rw-r--r--libs/pbd/cpus.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/pbd/cpus.cc b/libs/pbd/cpus.cc
index ba4ba32fe4..80c40162ea 100644
--- a/libs/pbd/cpus.cc
+++ b/libs/pbd/cpus.cc
@@ -25,6 +25,7 @@
#ifdef __linux__
#include <unistd.h>
#elif defined(__APPLE__) || defined(__FreeBSD__)
+#include <sys/stddef.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#endif