--- a/mozglue/misc/TimeStamp_posix.cpp
+++ b/mozglue/misc/TimeStamp_posix.cpp
@@ -11,16 +11,17 @@
 // the smallest unit of time representable by struct timespec.  That
 // doesn't mean that a nanosecond is the resolution of TimeDurations
 // obtained with this API; see TimeDuration::Resolution;
 //
 
 #include <sys/syscall.h>
 #include <time.h>
 #include <unistd.h>
+#include <string.h>
 
 #if defined(__DragonFly__) || defined(__FreeBSD__) \
     || defined(__NetBSD__) || defined(__OpenBSD__)
 #include <sys/param.h>
 #include <sys/sysctl.h>
 #endif
 
 #if defined(__DragonFly__) || defined(__FreeBSD__)
@@ -200,17 +201,17 @@ TimeStamp::Shutdown()
 }
 
 TimeStamp
 TimeStamp::Now(bool aHighResolution)
 {
   return TimeStamp(ClockTimeNs());
 }
 
-#if defined(LINUX) || defined(ANDROID)
+#if defined(XP_LINUX) || defined(ANDROID)
 
 // Calculates the amount of jiffies that have elapsed since boot and up to the
 // starttime value of a specific process as found in its /proc/*/stat file.
 // Returns 0 if an error occurred.
 
 static uint64_t
 JiffiesSinceBoot(const char* aFile)
 {