diff --git a/configure.ac b/configure.ac
index 1949ef62..c44e1f0e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -173,7 +173,7 @@ AC_CHECK_LIB(X11, XOpenDisplay,
              [GTK_LIBS="-lX11 $GTK_LIBS"
               AC_DEFINE([HAVE_LIBX11],[],[Define if libX11.a is available])])
 
-AC_CHECK_FUNCS([getaddrinfo posix_openpt ptsname setresuid strsignal updwtmpx fstatat dirfd futimes])
+AC_CHECK_FUNCS([getaddrinfo posix_openpt ptsname setresuid strsignal updwtmpx fstatat dirfd futimes setpwent endpwent])
 AC_CHECK_DECLS([CLOCK_MONOTONIC], [], [], [[#include <time.h>]])
 AC_CHECK_HEADERS([sys/auxv.h asm/hwcap.h])
 AC_SEARCH_LIBS([clock_gettime], [rt], [AC_DEFINE([HAVE_CLOCK_GETTIME],[],[Define if clock_gettime() is available])])
diff --git a/unix/uxmisc.c b/unix/uxmisc.c
index 2170c3c4..00c19779 100644
--- a/unix/uxmisc.c
+++ b/unix/uxmisc.c
@@ -119,7 +119,9 @@ char *get_username(void)
      * coping correctly with people who have su'ed.
      */
     user = getlogin();
+#if HAVE_SETPWENT
     setpwent();
+#endif
     if (user)
 	p = getpwnam(user);
     else
@@ -141,7 +143,9 @@ char *get_username(void)
 	    return NULL;
 	ret = p->pw_name;
     }
+#if HAVE_ENDPWENT
     endpwent();
+#endif
 
     return dupstr(ret);
 }