--- a/js/src/configure.in
+++ b/js/src/configure.in
@@ -3070,33 +3070,16 @@ if test "$ac_cv_thread_keyword" = yes; t
       :
       ;;
     *)
       AC_DEFINE(HAVE_THREAD_TLS_KEYWORD)
       ;;
   esac
 fi
 
-dnl Check for the existence of various allocation headers/functions
-
-MALLOC_H=
-MOZ_CHECK_HEADER(malloc.h,        [MALLOC_H=malloc.h])
-if test "$MALLOC_H" = ""; then
-  MOZ_CHECK_HEADER(malloc/malloc.h, [MALLOC_H=malloc/malloc.h])
-  if test "$MALLOC_H" = ""; then
-    MOZ_CHECK_HEADER(sys/malloc.h,    [MALLOC_H=sys/malloc.h])
-  fi
-fi
-if test "$MALLOC_H" != ""; then
-   AC_DEFINE_UNQUOTED(MALLOC_H, <$MALLOC_H>)
-fi
-
-MOZ_ALLOCATING_FUNCS="strndup posix_memalign memalign valloc"
-AC_CHECK_FUNCS(strndup posix_memalign memalign valloc)
-
 dnl See if compiler supports some gcc-style attributes
 
 AC_CACHE_CHECK(for __attribute__((always_inline)),
                ac_cv_attribute_always_inline,
                [AC_TRY_COMPILE([inline void f(void) __attribute__((always_inline));],
                                [],
                                ac_cv_attribute_always_inline=yes,
                                ac_cv_attribute_always_inline=no)])