diff --git a/configure.ac b/configure.ac
index f9375d40..84f0f18f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,7 +45,7 @@ AC_PROG_MAKE_SET
 
 # Checks for header files.
 AC_HEADER_MAJOR
-AC_CHECK_HEADERS([arpa/inet.h fcntl.h float.h langinfo.h libintl.h limits.h locale.h stdint.h stdio_ext.h stdlib.h string.h sys/file.h sys/ioctl.h sys/param.h sys/time.h termios.h unistd.h utmp.h values.h wchar.h wctype.h])
+AC_CHECK_HEADERS([arpa/inet.h fcntl.h float.h langinfo.h libintl.h limits.h locale.h stdint.h stdio_ext.h stdlib.h string.h sys/file.h sys/ioctl.h sys/param.h sys/time.h termios.h unistd.h utmp.h utmpx.h values.h wchar.h wctype.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_CHECK_HEADER_STDBOOL
diff --git a/w.c b/w.c
index bf275631..9c43bbd6 100644
--- a/w.c
+++ b/w.c
@@ -43,7 +43,11 @@
 #include <termios.h>
 #include <time.h>
 #include <unistd.h>
-#include <utmp.h>
+#ifdef HAVE_UTMPX_H
+#	include <utmpx.h>
+#else
+#	include <utmp.h>
+#endif
 #include <arpa/inet.h>
 
 #include "c.h"
@@ -57,7 +61,17 @@
 static int ignoreuser = 0;	/* for '-u' */
 static int oldstyle = 0;	/* for '-o' */
 
+#ifdef HAVE_UTMPX_H
+typedef struct utmpx utmp_t;
+#else
 typedef struct utmp utmp_t;
+#endif
+
+#if !defined(UT_HOSTSIZE) || defined(__UT_HOSTSIZE)
+#	define UT_HOSTSIZE __UT_HOSTSIZE
+#	define UT_LINESIZE __UT_LINESIZE
+#	define UT_NAMESIZE __UT_NAMESIZE
+#endif
 
 #ifdef W_SHOWFROM
 # define FROM_STRING "on"
@@ -471,7 +485,11 @@ static void showinfo(
         printf("%-*.*s%-9.8s", userlen + 1, userlen, uname, u->ut_line);
         if (from)
             print_from(u, ip_addresses, fromlen);
+#ifdef HAVE_UTMPX_H
+        print_logintime(u->ut_tv.tv_sec, stdout);
+#else
         print_logintime(u->ut_time, stdout);
+#endif
         if (*u->ut_line == ':')
             /* idle unknown for xdm logins */
             printf(" ?xdm? ");
@@ -653,11 +671,19 @@ int main(int argc, char **argv)
 			printf(_("   IDLE WHAT\n"));
 	}
 
+#ifdef HAVE_UTMPX_H
+	setutxent();
+#else
 	utmpname(UTMP_FILE);
 	setutent();
+#endif
 	if (user) {
 		for (;;) {
+#ifdef HAVE_UTMPX_H
+			u = getutxent();
+#else
 			u = getutent();
+#endif
 			if (!u)
 				break;
 			if (u->ut_type != USER_PROCESS)
@@ -668,7 +694,11 @@ int main(int argc, char **argv)
 		}
 	} else {
 		for (;;) {
+#ifdef HAVE_UTMPX_H
+			u = getutxent();
+#else
 			u = getutent();
+#endif
 			if (!u)
 				break;
 			if (u->ut_type != USER_PROCESS)
@@ -678,7 +708,11 @@ int main(int argc, char **argv)
 					 fromlen, ip_addresses);
 		}
 	}
+#ifdef HAVE_UTMPX_H
+	endutxent();
+#else
 	endutent();
+#endif
 
 	return EXIT_SUCCESS;
 }