diff --git a/lib/arc4random.c b/lib/arc4random.c
index 1e4ee849..f85c560a 100644
--- a/lib/arc4random.c
+++ b/lib/arc4random.c
@@ -60,5 +60,7 @@ void arc4random_stir(void) {
 }
 
 void arc4random_addrandom(unsigned char* dat,size_t datlen) {
+  (void)dat;
+  (void)datlen;
 }
 
diff --git a/libpthread/pthread_rwlock_destroy.c b/libpthread/pthread_rwlock_destroy.c
index 597edcea..3c0ee565 100644
--- a/libpthread/pthread_rwlock_destroy.c
+++ b/libpthread/pthread_rwlock_destroy.c
@@ -1,5 +1,6 @@
 #include <pthread.h>
 
 int pthread_rwlock_destroy(pthread_rwlock_t *rwlock) {
+  (void)rwlock;
   return 0;
 }
diff --git a/libpthread/pthread_rwlock_init.c b/libpthread/pthread_rwlock_init.c
index a7bd6e1d..5eab8526 100644
--- a/libpthread/pthread_rwlock_init.c
+++ b/libpthread/pthread_rwlock_init.c
@@ -1,6 +1,7 @@
 #include <pthread.h>
 
 int pthread_rwlock_init(pthread_rwlock_t *rwlock, const pthread_rwlockattr_t *attr) {
+  (void)attr;
   rwlock->n=0;
   return 0;
 }
diff --git a/librpc/clnt_perror.c b/librpc/clnt_perror.c
index 269cf589..80ebbb0e 100644
--- a/librpc/clnt_perror.c
+++ b/librpc/clnt_perror.c
@@ -150,7 +150,8 @@ char *clnt_sperror __P ((CLIENT *rpch, const char *s))
 
 void clnt_perror __P ((CLIENT *rpch, const char *s))
 {
-//	(void) fprintf(stderr, "%s", clnt_sperror(rpch, s));
+	(void)rpch;
+	(void)s;
 	(void) fprintf(stderr, "(not supported)");
 }
 
@@ -264,7 +265,7 @@ char *clnt_spcreateerror __P ((__const char *s))
 
 extern void clnt_pcreateerror __P ((__const char *s))
 {
-//	(void) fprintf(stderr, "%s", clnt_spcreateerror(s));
+	(void)s;
 	(void) fprintf(stderr, "(not supported)");
 }