From upstream git:
http://www.canonware.com/cgi-bin/gitweb.cgi?p=jemalloc.git;a=patch;h=5c710cee783a44061fa2c467ffd8984b8047b90e

diff -Naur ../jemalloc-3.0.0.orig/src/jemalloc.c ./src/jemalloc.c
--- ../jemalloc-3.0.0.orig/src/jemalloc.c	2012-05-12 02:50:38.000000000 +0200
+++ ./src/jemalloc.c	2012-05-24 09:25:07.371417566 +0200
@@ -1262,11 +1262,10 @@
  * passed an extra argument for the caller return address, which will be
  * ignored.
  */
-JEMALLOC_EXPORT void (* const __free_hook)(void *ptr) = je_free;
-JEMALLOC_EXPORT void *(* const __malloc_hook)(size_t size) = je_malloc;
-JEMALLOC_EXPORT void *(* const __realloc_hook)(void *ptr, size_t size) =
-    je_realloc;
-JEMALLOC_EXPORT void *(* const __memalign_hook)(size_t alignment, size_t size) =
+JEMALLOC_EXPORT void (* __free_hook)(void *ptr) = je_free;
+JEMALLOC_EXPORT void *(* __malloc_hook)(size_t size) = je_malloc;
+JEMALLOC_EXPORT void *(* __realloc_hook)(void *ptr, size_t size) = je_realloc;
+JEMALLOC_EXPORT void *(* __memalign_hook)(size_t alignment, size_t size) =
     je_memalign;
 #endif