diff --git a/executer/kernel/mcctrl/syscall.c b/executer/kernel/mcctrl/syscall.c
index 167a7906..7970822a 100644
--- a/executer/kernel/mcctrl/syscall.c
+++ b/executer/kernel/mcctrl/syscall.c
@@ -1715,6 +1715,7 @@ out:
 	return error;
 }
 
+#ifdef SC_DEBUG
 #ifdef MCCTRL_KSYM_walk_page_range
 static void
 (*mcctrl_walk_page_range)(unsigned long addr, unsigned long end, struct mm_walk *walk)
@@ -1748,6 +1749,7 @@ static int mywalk(pte_t *pte, unsigned long addr, unsigned long next, struct mm_
 	}
 	return 0;
 }
+#endif
 
 static long pager_req_mlock_list(ihk_os_t os, unsigned long start,
 				 unsigned long end, void *addr, int nent)
diff --git a/executer/user/mcexec.c b/executer/user/mcexec.c
index 8c1ce0e6..fd945aff 100644
--- a/executer/user/mcexec.c
+++ b/executer/user/mcexec.c
@@ -1576,7 +1576,9 @@ opendev()
 static void ld_preload_init()
 {
 	char envbuf[PATH_MAX];
+#ifdef ENABLE_QLMPI
 	char *old_ld_preload;
+#endif
 
 	if (disable_sched_yield) {
 		sprintf(envbuf, "%s/libsched_yield.so.1.0.0", MCKERNEL_LIBDIR);
diff --git a/kernel/mikc.c b/kernel/mikc.c
index 5c9612b9..dffed4f6 100644
--- a/kernel/mikc.c
+++ b/kernel/mikc.c
@@ -17,6 +17,8 @@
 #include <ikc/msg.h>
 #include <kmalloc.h>
 
+extern int ihk_mc_ikc_init_first(struct ihk_ikc_channel_desc *,
+                          ihk_ikc_ph_t handler);
 static struct ihk_ikc_channel_desc *mchannel;
 static int arch_master_channel_packet_handler(struct ihk_ikc_channel_desc *,
                                          void *__packet, void *arg);