diff --git a/moo/lib/bigint.c b/moo/lib/bigint.c
index 735686a..6049c53 100644
--- a/moo/lib/bigint.c
+++ b/moo/lib/bigint.c
@@ -1283,12 +1283,12 @@ oops:
 	tmplen[0] = ndigits_yl + ndigits_yh + 1; 
 	tmplen[1] = ndigits_xh + ndigits_yh;
 	if (tmplen[1] < tmplen[0]) tmplen[1] = tmplen[0];
-	tmp[1] = (hcl_liw_t*)moo_callocmem(moo, MOO_SIZEOF(moo_liw_t) * tmplen[1]);
+	tmp[1] = (moo_liw_t*)moo_callocmem(moo, MOO_SIZEOF(moo_liw_t) * tmplen[1]);
 	if (!tmp[1]) goto oops;
 
 	/* make a temporary for (a0 + a1) and (a0 * b0) */
 	tmplen[0] = ndigits_xl + ndigits_yl;
-	tmp[0] = (hcl_liw_t*)moo_callocmem(moo, MOO_SIZEOF(moo_liw_t) * tmplen[0]);
+	tmp[0] = (moo_liw_t*)moo_callocmem(moo, MOO_SIZEOF(moo_liw_t) * tmplen[0]);
 	if (!tmp[0]) goto oops;
 
 	/* tmp[0] = a0 + a1 */
diff --git a/moo/lib/main.c b/moo/lib/main.c
index 13710a1..60f39c2 100644
--- a/moo/lib/main.c
+++ b/moo/lib/main.c
@@ -543,7 +543,7 @@ static moo_ooi_t input_handler (moo_t* moo, moo_iocmd_t cmd, moo_ioarg_t* arg)
 static void* alloc_heap (moo_t* moo, moo_oow_t size)
 {
 #if defined(HAVE_MMAP) && defined(HAVE_MUNMAP) && defined(MAP_ANONYMOUS)
-	/* It's called via moo_makeheap() when HCL creates a GC heap.
+	/* It's called via moo_makeheap() when MOO creates a GC heap.
 	 * The heap is large in size. I can use a different memory allocation
 	 * function instead of an ordinary malloc.
 	 * upon failure, it doesn't require to set error information as moo_makeheap()
@@ -1242,6 +1242,20 @@ static const char* mach_dlerror (void)
 }
 #endif
 
+static void dl_startup (moo_t* moo)
+{
+#if defined(USE_LTDL)
+	lt_dlinit ();
+#endif
+}
+
+static void dl_cleanup (moo_t* moo)
+{
+#if defined(USE_LTDL)
+	lt_dlexit ();
+#endif
+}
+
 static void* dl_open (moo_t* moo, const moo_ooch_t* name, int flags)
 {
 #if defined(USE_LTDL) || defined(USE_DLFCN) || defined(USE_MACH_O_DYLD) || defined(USE_WIN_DLL)
@@ -3023,6 +3037,8 @@ int main (int argc, char* argv[])
 	vmprim.log_write = log_write;
 	vmprim.syserrstrb = syserrstrb;
 	vmprim.assertfail = assert_fail;
+	vmprim.dl_startup = dl_startup;
+	vmprim.dl_cleanup = dl_cleanup;
 	vmprim.dl_open = dl_open;
 	vmprim.dl_close = dl_close;
 	vmprim.dl_getsym = dl_getsym;
@@ -3035,17 +3051,10 @@ int main (int argc, char* argv[])
 	vmprim.vm_muxwait = vm_muxwait;
 	vmprim.vm_sleep = vm_sleep;
 
-#if defined(USE_LTDL)
-	lt_dlinit ();
-#endif
-
 	moo = moo_open (&sys_mmgr, MOO_SIZEOF(xtn_t), memsize, &vmprim, MOO_NULL);
 	if (!moo)
 	{
 		fprintf (stderr, "ERROR: cannot open moo\n");
-	#if defined(USE_LTDL)
-		lt_dlexit ();
-	#endif
 		return -1;
 	}
 
@@ -3085,9 +3094,6 @@ int main (int argc, char* argv[])
 		if (handle_logopt (moo, logopt) <= -1) 
 		{
 			moo_close (moo);
-		#if defined(USE_LTDL)
-			lt_dlexit ();
-		#endif
 			return -1;
 		}
 	}
@@ -3103,9 +3109,6 @@ int main (int argc, char* argv[])
 		if (handle_dbgopt (moo, dbgopt) <= -1)
 		{
 			moo_close (moo);
-		#if defined(USE_LTDL)
-			lt_dlexit ();
-		#endif
 			return -1;
 		}
 	}
@@ -3115,9 +3118,6 @@ int main (int argc, char* argv[])
 	{
 		moo_logbfmt (moo, MOO_LOG_STDERR, "ERROR: cannot ignite moo - [%d] %js\n", moo_geterrnum(moo), moo_geterrstr(moo));
 		moo_close (moo);
-	#if defined(USE_LTDL)
-		lt_dlexit ();
-	#endif
 		return -1;
 	}
 
@@ -3168,9 +3168,6 @@ int main (int argc, char* argv[])
 			}
 
 			moo_close (moo);
-		#if defined(USE_LTDL)
-			lt_dlexit ();
-		#endif
 			return -1;
 		}
 	}
@@ -3199,10 +3196,5 @@ int main (int argc, char* argv[])
 	 *moo_dumpdic(moo, moo->sysdic, "System dictionary");*/
 
 	moo_close (moo);
-
-#if defined(USE_LTDL)
-	lt_dlexit ();
-#endif
-
 	return xret;
 }
diff --git a/moo/lib/moo.c b/moo/lib/moo.c
index 14f88b1..917a864 100644
--- a/moo/lib/moo.c
+++ b/moo/lib/moo.c
@@ -149,6 +149,7 @@ int moo_init (moo_t* moo, moo_mmgr_t* mmgr, moo_oow_t heapsz, const moo_vmprim_t
 	moo->newheap = moo_makeheap (moo, heapsz);
 	if (!moo->newheap) goto oops;
 
+	if (moo->vmprim.dl_startup) moo->vmprim.dl_startup (moo);
 	return 0;
 
 oops:
@@ -284,6 +285,8 @@ void moo_fini (moo_t* moo)
 		moo->inttostr.t.ptr = MOO_NULL;
 		moo->inttostr.t.capa = 0;
 	}
+
+	if (moo->vmprim.dl_cleanup) moo->vmprim.dl_cleanup (moo);
 }
 
 int moo_setoption (moo_t* moo, moo_option_t id, const void* value)
diff --git a/moo/lib/moo.h b/moo/lib/moo.h
index 50f0837..b141b4a 100644
--- a/moo/lib/moo.h
+++ b/moo/lib/moo.h
@@ -1098,6 +1098,14 @@ enum moo_vmprim_dlopen_flag_t
 };
 typedef enum moo_vmprim_dlopen_flag_t moo_vmprim_dlopen_flag_t;
 
+typedef void (*moo_vmprim_dlstartup_t) (
+	moo_t*             moo
+);
+
+typedef void (*moo_vmprim_dlcleanup_t) (
+	moo_t*             moo
+);
+
 typedef void* (*moo_vmprim_dlopen_t) (
 	moo_t*                  moo,
 	const moo_ooch_t*       name,
@@ -1164,14 +1172,16 @@ typedef void (*moo_vmprim_sleep_t) (
 
 struct moo_vmprim_t
 {
-	moo_alloc_heap_t      alloc_heap;
-	moo_free_heap_t       free_heap;
+	moo_alloc_heap_t       alloc_heap;
+	moo_free_heap_t        free_heap;
 
 	moo_log_write_t        log_write;
 	moo_syserrstrb_t       syserrstrb;
 	moo_syserrstru_t       syserrstru;
 	moo_assertfail_t       assertfail;
 
+	moo_vmprim_dlstartup_t dl_startup;
+	moo_vmprim_dlcleanup_t dl_cleanup;
 	moo_vmprim_dlopen_t    dl_open;
 	moo_vmprim_dlclose_t   dl_close;
 	moo_vmprimt_dlgetsym_t dl_getsym;