diff -Naur a/configure b/configure
--- a/configure	2020-08-02 07:10:28.000000000 +0000
+++ b/configure	2020-08-05 17:57:14.223672638 +0000
@@ -14966,6 +14966,7 @@
             {
               O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND,
               O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
+              , O_BINARY, O_TEXT
             };
 
 int
diff -Naur a/m4/fcntl-o.m4 b/m4/fcntl-o.m4
--- a/m4/fcntl-o.m4	2020-05-09 13:40:19.000000000 +0000
+++ b/m4/fcntl-o.m4	2020-08-05 17:57:14.144671841 +0000
@@ -42,6 +42,7 @@
             {
               O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND,
               O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
+              , O_BINARY, O_TEXT
             };
           ]],
           [[