diff -up firefox-66.0/media/libopus/silk/arm/arm_silk_map.c.old firefox-66.0/media/libopus/silk/arm/arm_silk_map.c
--- firefox-66.0/media/libopus/silk/arm/arm_silk_map.c.old	2019-03-12 21:07:35.356677522 +0100
+++ firefox-66.0/media/libopus/silk/arm/arm_silk_map.c	2019-03-12 21:07:42.937693394 +0100
@@ -28,7 +28,7 @@ POSSIBILITY OF SUCH DAMAGE.
 # include "config.h"
 #endif
 
-#include "main_FIX.h"
+#include "fixed/main_FIX.h"
 #include "NSQ.h"
 #include "SigProc_FIX.h"