$OpenBSD$

What is this even?

Index: lib/utils/mu-readline.cc
--- lib/utils/mu-readline.cc.orig
+++ lib/utils/mu-readline.cc
@@ -68,7 +68,7 @@ static size_t      max_lines{};
 void
 Mu::setup_readline (const std::string& histpath, size_t maxlines)
 {
-        is_a_tty  = !!::isatty(::fileno(stdout));
+        is_a_tty  = !!::isatty(fileno(stdout));
         hist_path = histpath;
         max_lines = maxlines;