fifo: Fix build

Test: builds OK on macOS
Change-Id: Icac55988f07fb4e4960edd218a33963b6908ce33

diff --git a/audio_utils/include/audio_utils/futex.h b/audio_utils/include/audio_utils/futex.h
index 016952e..77e6fa8 100644 (file)
--- a/audio_utils/include/audio_utils/futex.h
+++ b/audio_utils/include/audio_utils/futex.h
@@ -24,6 +24,7 @@
 #include <linux/futex.h>
 #include <sys/syscall.h>
 #else
+#include <errno.h>
 #define FUTEX_WAIT 0
 #define FUTEX_WAIT_PRIVATE 0
 #define FUTEX_WAKE 0