diff -rN -u old-jhc/rts/rts/gc_jgc.c new-jhc/rts/rts/gc_jgc.c
--- old-jhc/rts/rts/gc_jgc.c	2012-12-07 11:41:31.692778775 +0900
+++ new-jhc/rts/rts/gc_jgc.c	2012-12-07 11:41:32.084780728 +0900
@@ -18,7 +18,7 @@
 static void clear_used_bits(struct s_arena *arena) A_UNUSED;
 static void s_cleanup_blocks(struct s_arena *arena);
 static struct s_block *get_free_block(gc_t gc, struct s_arena *arena);
-static void *aligned_alloc(unsigned size);
+static void *jhc_aligned_alloc(unsigned size);
 
 typedef struct {
         sptr_t ptrs[0];
@@ -231,7 +231,7 @@
 
 static heap_t A_STD
 s_monoblock(struct s_arena *arena, unsigned size, unsigned nptrs, unsigned flags) {
-        struct s_block *b = aligned_alloc(size * sizeof(uintptr_t));
+        struct s_block *b = jhc_aligned_alloc(size * sizeof(uintptr_t));
         b->flags = flags | SLAB_MONOLITH;
         b->color = (sizeof(struct s_block) + BITARRAY_SIZE_IN_BYTES(1) +
                     sizeof(uintptr_t) - 1) / sizeof(uintptr_t);
@@ -292,7 +292,7 @@
 }
 
 static void *
-aligned_alloc(unsigned size) {
+jhc_aligned_alloc(unsigned size) {
         void *base;
 #if defined(__WIN32__)
         base = _aligned_malloc(MEGABLOCK_SIZE, BLOCK_SIZE);
@@ -318,7 +318,7 @@
 s_new_megablock(struct s_arena *arena)
 {
         struct s_megablock *mb = malloc(sizeof(*mb));
-        mb->base = aligned_alloc(MEGABLOCK_SIZE);
+        mb->base = jhc_aligned_alloc(MEGABLOCK_SIZE);
         VALGRIND_MAKE_MEM_NOACCESS(mb->base,MEGABLOCK_SIZE);
         mb->next_free = 0;
         return mb;