Index: lib/sanitizer_common/sanitizer_linux.cc
===================================================================
--- lib/sanitizer_common/sanitizer_linux.cc
+++ lib/sanitizer_common/sanitizer_linux.cc
@@ -60,6 +60,7 @@
 #include <unistd.h>
 
 #if SANITIZER_FREEBSD
+#include <ucontext.h>
 #include <sys/sysctl.h>
 #include <machine/atomic.h>
 extern "C" {