Index: contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
===================================================================
--- contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h	(revision 246162)
+++ contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h	(working copy)
@@ -68,9 +68,26 @@ extern int __isthreaded;
 #define	isthreaded		((bool)__isthreaded)
 
 /* Mangle. */
+#undef je_malloc
+#undef je_realloc
+#undef je_free
+#define	je_malloc		__malloc
+#define	je_realloc		__realloc
+#define	je_free			__free
 #define	open			_open
 #define	read			_read
 #define	write			_write
 #define	close			_close
 #define	pthread_mutex_lock	_pthread_mutex_lock
 #define	pthread_mutex_unlock	_pthread_mutex_unlock
+
+#ifdef JEMALLOC_C_
+/*
+ * Define 'weak' symbols so that an application is can have its own versions
+ * of malloc, realloc, and free routines.
+ */
+__weak_reference(__malloc, malloc);
+__weak_reference(__realloc, realloc);
+__weak_reference(__free, free);
+#endif
+
Index: lib/libc/stdlib/jemalloc/Symbol.map
===================================================================
--- lib/libc/stdlib/jemalloc/Symbol.map	(revision 246162)
+++ lib/libc/stdlib/jemalloc/Symbol.map	(working copy)
@@ -5,6 +5,9 @@
 FBSD_1.0 {
 	_malloc_options;
 	_malloc_message;
+	__malloc;
+	__realloc;
+	__free;
 	malloc;
 	posix_memalign;
 	calloc;