Index: lib/sanitizer_common/sanitizer_platform.h
===================================================================
--- lib/sanitizer_common/sanitizer_platform.h
+++ lib/sanitizer_common/sanitizer_platform.h
@@ -13,7 +13,7 @@
 #ifndef SANITIZER_PLATFORM_H
 #define SANITIZER_PLATFORM_H
 
-#if !defined(__linux__) && !defined(__FreeBSD__) && \
+#if !defined(__linux__) && !defined(__FreeBSD__) && !defined(__NetBSD__) \
   !defined(__APPLE__) && !defined(_WIN32)
 # error "This operating system is not supported"
 #endif
@@ -30,6 +30,12 @@
 # define SANITIZER_FREEBSD 0
 #endif
 
+#if defined(__NetBSD__)
+# define SANITIZER_NETBSD 1
+#else
+# define SANITIZER_NETBSD 0
+#endif
+
 #if defined(__APPLE__)
 # define SANITIZER_MAC     1
 # include <TargetConditionals.h>
@@ -79,7 +85,8 @@
 # define SANITIZER_ANDROID 0
 #endif
 
-#define SANITIZER_POSIX (SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_MAC)
+#define SANITIZER_POSIX \
+  (SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_MAC || SANITIZER_NETBSD)
 
 #if __LP64__ || defined(_WIN64)
 #  define SANITIZER_WORDSIZE 64