diff --git a/proc/devname.c b/proc/devname.c
index 6e8d2863..4be24e98 100644
--- a/proc/devname.c
+++ b/proc/devname.c
@@ -70,7 +70,7 @@ static void load_drivers(void){
   p = buf;
   while(( p = strstr(p, " /dev/") )){  // " /dev/" is the second column
     tty_map_node *tmn;
-    int len;
+    size_t len;
     char *end;
     p += 6;
     end = strchr(p, ' ');
diff --git a/proc/escape.c b/proc/escape.c
index 1fd4e74a..ca731989 100644
--- a/proc/escape.c
+++ b/proc/escape.c
@@ -153,7 +153,7 @@ int escape_str(char *restrict dst, const char *restrict src, int bufsize, int *m
 // escape an argv or environment string array
 //
 // bytes arg means sizeof(buf)
-int escape_strlist(char *restrict dst, const char *restrict const *restrict src, size_t bytes, int *cells){
+int escape_strlist(char *restrict dst, char *restrict const *restrict src, size_t bytes, int *cells){
   size_t i = 0;
 
   for(;;){
@@ -175,7 +175,7 @@ int escape_command(char *restrict const outbuf, const proc_t *restrict const pp,
   int end = 0;
 
   if(flags & ESC_ARGS){
-    const char **lc = (const char**)pp->cmdline;
+    char **lc = (char**)pp->cmdline;
     if(lc && *lc) return escape_strlist(outbuf, lc, bytes, cells);
   }
   if(flags & ESC_BRACKETS){
diff --git a/proc/escape.h b/proc/escape.h
index aa9f6d64..8ef7b2f2 100644
--- a/proc/escape.h
+++ b/proc/escape.h
@@ -14,7 +14,7 @@ EXTERN_C_BEGIN
 #define ESC_BRACKETS 0x2  // if using cmd, put '[' and ']' around it
 #define ESC_DEFUNCT  0x4  // mark zombies with " <defunct>"
 
-extern int escape_strlist(char *restrict dst, const char *restrict const *restrict src, size_t n, int *cells);
+extern int escape_strlist(char *restrict dst, char *restrict const *restrict src, size_t n, int *cells);
 extern int escape_str(char *restrict dst, const char *restrict src, int bufsize, int *maxcells);
 extern int escape_command(char *restrict const outbuf, const proc_t *restrict const pp, int bytes, int *cells, unsigned flags);
 extern int escaped_copy(char *restrict dst, const char *restrict src, int bufsize, int *maxroom);
diff --git a/ps/output.c b/ps/output.c
index 2cb36a2f..5dbae861 100644
--- a/ps/output.c
+++ b/ps/output.c
@@ -77,7 +77,6 @@ static unsigned max_leftward = 0x12345678; /* space for LEFT stuff */
 static int wide_signals;  /* true if we have room */
 
 static time_t seconds_since_1970;
-static time_t time_of_boot;
 static unsigned long page_shift;
 
 
@@ -625,7 +624,7 @@ static int pr_pri_api(char *restrict const outbuf, const proc_t *restrict const
 }
 
 static int pr_nice(char *restrict const outbuf, const proc_t *restrict const pp){
-  if(pp->sched!=0 && pp->sched!=-1) return snprintf(outbuf, COLWID, "-");
+  if(pp->sched!=0 && pp->sched!=(unsigned long)-1) return snprintf(outbuf, COLWID, "-");
   return snprintf(outbuf, COLWID, "%ld", pp->nice);
 }
 
@@ -662,11 +661,11 @@ static int pr_class(char *restrict const outbuf, const proc_t *restrict const pp
 //    default   "%u:%u", type, prio
 // We just print the priority, and have other keywords for type.
 static int pr_rtprio(char *restrict const outbuf, const proc_t *restrict const pp){
-  if(pp->sched==0 || pp->sched==-1) return snprintf(outbuf, COLWID, "-");
+  if(pp->sched==0 || pp->sched==(unsigned long)-1) return snprintf(outbuf, COLWID, "-");
   return snprintf(outbuf, COLWID, "%ld", pp->rtprio);
 }
 static int pr_sched(char *restrict const outbuf, const proc_t *restrict const pp){
-  if(pp->sched==-1) return snprintf(outbuf, COLWID, "-");
+  if(pp->sched==(unsigned long)-1) return snprintf(outbuf, COLWID, "-");
   return snprintf(outbuf, COLWID, "%ld", pp->sched);
 }
 
diff --git a/ps/stacktrace.c b/ps/stacktrace.c
index 1e84188f..c2b4ece0 100644
--- a/ps/stacktrace.c
+++ b/ps/stacktrace.c
@@ -30,7 +30,7 @@ static void debug_stop(char **args){
 }
 
 /***********/
-static void stack_trace_sigchld(int signum){
+static void stack_trace_sigchld(int signum __attribute__ ((__unused__))){
   stack_trace_done = 1;
 }
 
@@ -156,7 +156,7 @@ void debug(int method, char *prog_name){
 }
 
 /************/
-static void stack_trace_sigsegv(int signum){
+static void stack_trace_sigsegv(int signum __attribute__ ((__unused__))){
   debug(STACK_TRACE, stored_prog_name);
 }