Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -482,7 +482,7 @@ if test "x$uname_s" = "xHP-UX"; then
 fi
 
 AC_CHECK_FUNCS([ftime gethostbyname gethostname gettimeofday inet_ntoa memmove memset mmap mkfifo select socket strchr strcspn strdup strerror strstr])
-AC_CHECK_FUNCS([setsid setpgrp getpwuid getpwnam getspnam getuid geteuid setuid setgid seteuid setegid initgroups waitpid setutxent grantpt shmat])
+AC_CHECK_FUNCS([setsid setpgrp getpwuid getpwnam getspnam getuid geteuid setuid setgid seteuid setegid initgroups waitpid setutxent posix_openpt grantpt shmat])
 
 
 # check, if shmget is in cygipc.a