diff --git a/include/minix/ipc.h b/include/minix/ipc.h
index fc61d6c09..85b84e9c7 100644
--- a/include/minix/ipc.h
+++ b/include/minix/ipc.h
@@ -39,7 +39,7 @@ typedef struct {
 	u32_t dev;
 	u8_t pages;
 	u8_t flags;
-} mess_vmmcp __packed;
+} mess_vmmcp;
 
 typedef struct {
 	endpoint_t who;
@@ -50,9 +50,9 @@ typedef struct {
 	u32_t len;
 	u16_t fd;
 	u16_t clearend_and_flags; /* low 12 bits are clearend, rest flags */
-} mess_vm_vfs_mmap __packed;
+} mess_vm_vfs_mmap;
 
-typedef struct { u8_t flags; void *addr; } mess_vmmcp_reply __packed;
+typedef struct { u8_t flags; void *addr; } mess_vmmcp_reply;
 
 typedef struct {
   endpoint_t m_source;		/* who sent the message */
diff --git a/lib/libc/sys-minix/_ucontext.c b/lib/libc/sys-minix/_ucontext.c
index 7d9d11d37..9ce993ce7 100644
--- a/lib/libc/sys-minix/_ucontext.c
+++ b/lib/libc/sys-minix/_ucontext.c
@@ -2,6 +2,7 @@
 #include <namespace.h>
 #include <lib.h>
 #include <machine/stackframe.h>
+#include <sys/cdefs.h>
 #include <ucontext.h>
 #include <signal.h>
 #include <stdarg.h>
@@ -245,6 +246,7 @@ int swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
 /*===========================================================================*
  *				resumecontext				     *
  *===========================================================================*/
+__dead
 void resumecontext(ucontext_t *ucp)
 {
   if (ucp->uc_link == NULL) exit(0);
diff --git a/lib/libc/sys-minix/reboot.c b/lib/libc/sys-minix/reboot.c
index 393757b3c..806d9dbdd 100644
--- a/lib/libc/sys-minix/reboot.c
+++ b/lib/libc/sys-minix/reboot.c
@@ -5,6 +5,7 @@
 
 #include <sys/cdefs.h>
 #include <lib.h>
+#include <unistd.h>
 #include "namespace.h"
 
 #include <unistd.h>
diff --git a/servers/lwip/inet_config.c b/servers/lwip/inet_config.c
index b575597ac..b57a70056 100644
--- a/servers/lwip/inet_config.c
+++ b/servers/lwip/inet_config.c
@@ -45,13 +45,14 @@ int ip_forward_directed_bcast= 0;	/* Default is off */
 
 static int ifdefault= -1;		/* Default network interface. */
 
-static void fatal(char *label)
+__dead
+static void fatal(const char *label)
 {
 	printf("init: %s: %s\n", label, strerror(errno));
 	exit(1);
 }
 
-static void check_mknod(char *device, mode_t mode, int minor)
+static void check_mknod(const char *device, mode_t mode, int minor)
 /* Check if a device exists with the proper device number. */
 {
 	dev_t dev;
diff --git a/servers/lwip/lwip.c b/servers/lwip/lwip.c
index 262af9d12..13f244fae 100644
--- a/servers/lwip/lwip.c
+++ b/servers/lwip/lwip.c
@@ -34,7 +34,7 @@ extern struct sock_ops sock_udp_ops;
 extern struct sock_ops sock_tcp_ops;
 extern struct sock_ops sock_raw_ip_ops;
 
-void sys_init(void)
+static void sys_init(void)
 {
 }
 
@@ -91,7 +91,7 @@ static int sef_cb_init_fresh(__unused int type, __unused sef_init_info_t *info)
 	set_timer(&tcp_stmr, tcp_sticks, tcp_swatchdog, 0);
 	
 	netif_init();
-	netif_lo = netif_find("lo0");
+	netif_lo = netif_find((char *) "lo0");
 
 	/* Read configuration. */
 #if 0
@@ -160,12 +160,15 @@ static void sef_local_startup()
 static void ds_event(void)
 {
 	char key[DS_MAX_KEYLEN];
-	char *driver_prefix = "drv.net.";
+	const char *driver_prefix = "drv.net.";
 	char *label;
 	u32_t value;
 	int type;
 	endpoint_t owner_endpoint;
 	int r;
+        int prefix_len;
+
+        prefix_len = strlen(driver_prefix);
 
 	/* We may get one notification for multiple updates from DS. Get events
 	 * and owners from DS, until DS tells us that there are no more.
@@ -178,9 +181,10 @@ static void ds_event(void)
 		}
 
 		/* Only check for network driver up events. */
-		if(strncmp(key, driver_prefix, sizeof(driver_prefix))
-				|| value != DS_DRIVER_UP)
+		if(strncmp(key, driver_prefix, prefix_len)
+		  || value != DS_DRIVER_UP) {
 			return;
+		}
 
 		/* The driver label comes after the prefix. */
 		label = key + strlen(driver_prefix);
diff --git a/servers/pm/getset.c b/servers/pm/getset.c
index 9084b4e76..4e7f757c1 100644
--- a/servers/pm/getset.c
+++ b/servers/pm/getset.c
@@ -23,7 +23,7 @@ int do_get()
  */
 
   register struct mproc *rmp = mp;
-  int r, i;
+  int r;
   int ngroups;
 
   switch(call_nr) {