From 553ec11ec06fbe0beebfbb45f9dc3c9eabd83d28 Mon Sep 17 00:00:00 2001
From: Catherine <whitequark@whitequark.org>
Date: Mon, 14 Jul 2025 23:51:04 +0100
Subject: [PATCH] Make compatible with WASI (#4497)

WASI is a POSIX subset that doesn't have `dup`, `dup2`, or `pipe` system calls.

Fixes #4496.
---
 include/fmt/os.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/fmt/os.h b/include/fmt/os.h
index b2cc5e4b..40cdcdd4 100644
--- a/include/fmt/os.h
+++ b/include/fmt/os.h
@@ -29,7 +29,8 @@
 #  if (FMT_HAS_INCLUDE(<fcntl.h>) || defined(__APPLE__) || \
        defined(__linux__)) &&                              \
       (!defined(WINAPI_FAMILY) ||                          \
-       (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP))
+       (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP)) &&    \
+      !defined(__wasm__)
 #    include <fcntl.h>  // for O_RDONLY
 #    define FMT_USE_FCNTL 1
 #  else