From c548262664669f9268970a5506c8bce85bc0639c Mon Sep 17 00:00:00 2001
From: Pepper Gray <hello@peppergray.xyz>
Date: Sun, 3 May 2026 15:49:40 +0200
Subject: [PATCH] include missing header unistd.h

build on clang/musl fails with:

```
FEX/unittests/APITests/Allocator.cpp:17:5: error: use of undeclared identifier 'close'
FEX/unittests/APITests/Allocator.cpp:23:5: error: use of undeclared identifier 'lseek'; did you mean 'fseek'?
FEX/unittests/APITests/Allocator.cpp:23:11: error: cannot initialize a parameter of type 'FILE *' (aka 'struct _IO_FILE *') with an lvalue of type 'int'
FEX/unittests/APITests/Allocator.cpp:24:5: error: use of undeclared identifier 'write'; did you mean '_IO_cookie_io_functions_t::write'?
FEX/unittests/APITests/Allocator.cpp:24:5: error: invalid use of non-static data member 'write'
```

include header to provide defintions

fix: #5476
Signed-off-by: Pepper Gray <hello@peppergray.xyz>
---
 unittests/APITests/Allocator.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/unittests/APITests/Allocator.cpp b/unittests/APITests/Allocator.cpp
index 9c7119d68..c1aa86d06 100644
--- a/unittests/APITests/Allocator.cpp
+++ b/unittests/APITests/Allocator.cpp
@@ -1,6 +1,8 @@
 #include <catch2/catch_all.hpp>
 #include <FEXCore/Utils/Allocator.h>
 
+#include <unistd.h>
+
 namespace {
 
 using FEXCore::Allocator::MemoryRegion;