diff --git a/src/lib/commands/ldump.c b/src/lib/commands/ldump.c
index 7a8d730b..d4c32777 100644
--- a/src/lib/commands/ldump.c
+++ b/src/lib/commands/ldump.c
@@ -53,7 +53,6 @@ ldump(void)
     struct nstr_item ni;
     struct lndstr land;
     int vec[I_MAX + 1];
-    s_char *mission_short_name(int);
     int n, i;
     struct natstr *np;
     time_t now;
diff --git a/src/lib/commands/lstat.c b/src/lib/commands/lstat.c
index 2b6edc54..32f19935 100644
--- a/src/lib/commands/lstat.c
+++ b/src/lib/commands/lstat.c
@@ -50,7 +50,6 @@ lsta(void)
     int nunits;
     struct nstr_item ni;
     struct lndstr land;
-    s_char *mission_short_name(int);
 
     if (!snxtitem(&ni, EF_LAND, player->argp[1]))
 	return RET_SYN;
diff --git a/src/lib/commands/thre.c b/src/lib/commands/thre.c
index 4f76e861..4952eedc 100644
--- a/src/lib/commands/thre.c
+++ b/src/lib/commands/thre.c
@@ -49,7 +49,6 @@
 int
 thre(void)
 {
-    extern struct ichrstr *whatitem(s_char *, s_char *);
     struct sctstr sect;
     struct nstr_sect nstr;
     int val;
diff --git a/src/lib/lwp/lwp.c b/src/lib/lwp/lwp.c
index 458271ce..864ecafc 100644
--- a/src/lib/lwp/lwp.c
+++ b/src/lib/lwp/lwp.c
@@ -87,7 +87,6 @@ growsdown(void *x)
 void
 lwpReschedule(void)
 {
-    extern struct lwpQueue LwpSchedQ[];
     static int lcount = LCOUNT;
     static struct lwpProc *nextp;
     static int i;
diff --git a/src/lib/lwp/sel.c b/src/lib/lwp/sel.c
index 0e369d2d..5f5feae1 100644
--- a/src/lib/lwp/sel.c
+++ b/src/lib/lwp/sel.c
@@ -83,8 +83,6 @@ lwpInitSelect(struct lwpProc *proc)
 void
 lwpSleepFd(int fd, int mask)
 {
-    extern struct lwpProc *LwpCurrent;
-
     lwpStatus(LwpCurrent, "sleeping on fd %d", fd);
 
     if (LwpSelect.wait[fd] != 0) {
@@ -130,8 +128,6 @@ lwpWakeupFd(struct lwpProc *proc)
 void
 lwpSleepUntil(long int until)
 {
-    extern struct lwpProc *LwpCurrent;
-
     lwpStatus(LwpCurrent, "sleeping for %d sec", until - time(0));
     LwpCurrent->runtime = until;
     if (LwpSelect.maxfd == 0 && LwpSelect.delayq.head == 0) {
@@ -146,7 +142,6 @@ lwpSleepUntil(long int until)
 void
 lwpSelect(void *arg)
 {
-    extern struct lwpProc *LwpCurrent;
     struct lwpProc *us = LwpCurrent;
     fd_set readmask;
     fd_set writemask;
diff --git a/src/lib/lwp/sem.c b/src/lib/lwp/sem.c
index 16147db5..b6bd8df4 100644
--- a/src/lib/lwp/sem.c
+++ b/src/lib/lwp/sem.c
@@ -57,8 +57,6 @@ lwpCreateSem(char *name, int count)
 void
 lwpSignal(struct lwpSem *s)
 {
-    extern struct lwpProc *LwpCurrent;
-
     lwpStatus(LwpCurrent, "done with semaphore %s", s->name);
     if (s->count++ < 0) {
 	struct lwpProc *p = lwpGetFirst(&s->q);
@@ -77,8 +75,6 @@ lwpSignal(struct lwpSem *s)
 void
 lwpWait(struct lwpSem *s)
 {
-    extern struct lwpProc *LwpCurrent;
-
     lwpStatus(LwpCurrent, "checking semaphore %s", s->name);
     if (--s->count < 0) {
 	lwpStatus(LwpCurrent, "blocking");