--- configure.in.orig	Fri Dec  7 22:49:58 2012
+++ configure.in	Fri Dec  7 22:52:31 2012
@@ -71,7 +71,7 @@ AC_CHECK_FUNC(select,,AC_MSG_ERROR(Can't compile witho
 
 dnl Checks for library functions.
 AC_PROG_GCC_TRADITIONAL
-AC_CHECK_FUNCS(putenv strerror ttyname ptsname grantpt unlockpt)
+AC_CHECK_FUNCS(putenv strerror ttyname posix_openpt ptsname grantpt unlockpt)
 AC_CHECK_FUNCS(setsid tcflush)
 AC_CHECK_FUNCS(sigprocmask sigsetmask sighold, break)