diff --git a/configure.in b/configure.in
index 93848b427..fb217bfab 100644
--- a/configure.in
+++ b/configure.in
@@ -379,7 +379,7 @@ AC_TYPE_SIGNAL
 dnl Check for a few libraries and headers:
 
 AC_HEADER_DIRENT
-AC_CHECK_HEADERS(ctype.h unistd.h pwd.h fcntl.h string.h)
+AC_CHECK_HEADERS(ctype.h unistd.h pwd.h fcntl.h string.h sys/ioctl.h stropts.h)
 AC_HEADER_SYS_WAIT
 AC_HEADER_STAT