Compatibility with OpenBSD. Thanks, Steve Dee!

Makefile

@@ -88,10 +88,14 @@ OBJ = $(SRC:.c=.o) $(LIB)
 BIN = $(SRC:.c=)
 MAN = $(SRC:.c=.1)
 
-all: $(BIN)
+all: binlib
+
+binlib: util.a
+	$(MAKE) bin
+
+bin: $(BIN)
 
 $(OBJ): util.h config.mk
-$(BIN): util.a
 cat.o fold.o grep.o nl.o sort.o tail.o uniq.o: text.h
 cp.o mv.o rm.o: fs.h
 

env.c

@@ -14,7 +14,8 @@ main(int argc, char **argv)
 {
 	ARGBEGIN {
 	case 'i':
-		clearenv();
+		if(environ)
+			*environ = NULL;
 		break;
 	case 'u':
 		unsetenv(EARGF(usage()));

who.1

@@ -15,10 +15,6 @@ relies on the utmp file to be updated responsibly. This
 doesn't always happen, which can cause who to print completely
 bogus data.
 
-musl\-libc currently implements all utmpx functions as stubs Obviously,
-this command cannot work under such conditions.
-
 .SH SEE ALSO
-.IR getutxent (3)
-.IR utmpx (5)
+.IR utmp (5)
 

who.c

@@ -3,7 +3,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <time.h>
-#include <utmpx.h>
+#include <utmp.h>
 #include "util.h"
 
 static void usage(void);
@@ -11,21 +11,25 @@ static void usage(void);
 int
 main(int argc, char **argv)
 {
-	struct utmpx *ut;
+	struct utmp usr;
+	FILE *ufp;
 	time_t t;
 	char timebuf[sizeof "yyyy-mm-dd hh:mm"];
 
 	if(argc!=1)
 		usage();
 
-	while((ut=getutxent())) {
-		if(ut->ut_type != USER_PROCESS)
-			continue;
-		t = ut->ut_tv.tv_sec;
-		strftime(timebuf, sizeof timebuf, "%Y-%m-%d %H:%M", localtime(&t));
-		printf("%-8s %-12s %-16s\n", ut->ut_user, ut->ut_line, timebuf);
+	if (!(ufp = fopen(_PATH_UTMP, "r"))) {
+		eprintf("fopen:");
 	}
-	endutxent();
+	while(fread((char *)&usr, sizeof(usr), 1, ufp) == 1) {
+		if (!*usr.ut_name || !*usr.ut_line)
+			continue;
+		t = usr.ut_time;
+		strftime(timebuf, sizeof timebuf, "%Y-%m-%d %H:%M", localtime(&t));
+		printf("%-8s %-12s %-16s\n", usr.ut_name, usr.ut_line, timebuf);
+	}
+	fclose(ufp);
 	return 0;
 }