diff --git a/configure.ac b/configure.ac
index 01f51f2..dc790d0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -71,8 +71,8 @@ AC_FUNC_MALLOC
 AC_FUNC_REALLOC
 AC_CHECK_FUNCS([alarm dup2 gettimeofday localtime_r memset socket strcasecmp \
 		strchr strcspn strerror strncasecmp strpbrk strrchr strtol \
-		getifaddrs if_nameindex termios sigaction nanosleep \
-		gettimeofday getrusage setitimer])
+		getifaddrs if_nameindex sigaction nanosleep \
+		gettimeofday getrusage setitimer tcsetattr])
 
 # Check for CPU.
 # This requires install-sh, config.sub, config.guess from automake.
diff --git a/src/cenv.h b/src/cenv.h
index e39f478..9c7c7f9 100644
--- a/src/cenv.h
+++ b/src/cenv.h
@@ -216,8 +216,7 @@
    This only has features of interest for KLH10 software.
  */
 #ifndef  CENV_SYSF_TERMIOS	/* Has termios(3) tty stuff */
-# define CENV_SYSF_TERMIOS (CENV_SYS_DECOSF|CENV_SYS_SOLARIS|CENV_SYS_XBSD \
-			   |CENV_SYS_LINUX)
+# define CENV_SYSF_TERMIOS (HAVE_TERMIOS_H && HAVE_TCSETATTR)
 #endif
 #ifndef  CENV_SYSF_BSDTTY	/* Has old BSD tty stuff */
 # define CENV_SYSF_BSDTTY (!CENV_SYSF_TERMIOS && CENV_SYS_BSD)