Introduction

The short answer is no in any officially supported sense. Xcode 5 was built for newer toolchains, and while developers historically experimented with copying older SDK files into it, that workaround was brittle and never a reliable replacement for using the matching older Xcode release.

What Xcode 5 Officially Supports

Xcode 5 shipped in the iOS 7 era, and its toolchain, simulator support, and bundled SDK set were built around that generation. The iOS 6 SDK belongs to the Xcode 4.x line, so simply dropping old SDK files into Xcode 5 does not recreate the full environment that older builds expected.

The problem is not just headers and libraries. Xcode also coordinates:

• simulator runtimes
• Interface Builder behavior
• code-signing integration
• compiler and linker expectations

That is why manual SDK copying may appear to compile part of a project but still break in less obvious ways later.

The Practical Alternative: Use a Newer SDK with an Older Deployment Target

In most cases, you do not actually need the iOS 6 SDK. What you need is the ability to run on iOS 6 devices. Those are different things. The usual approach is:

• build with the newer SDK available in Xcode 5
• set the deployment target to iOS 6
• guard any APIs that were introduced after iOS 6

That lets you compile against newer headers while still supporting older operating systems at runtime when you code carefully.

A classic Objective-C example is checking whether an iOS 7-specific selector exists before using it:

1- (void)viewDidLoad {
2    [super viewDidLoad];
3
4    if ([self respondsToSelector:@selector(setEdgesForExtendedLayout:)]) {
5        self.edgesForExtendedLayout = UIRectEdgeNone;
6    }
7}

This pattern avoids calling a newer API on an older system that does not implement it.

You can also gate behavior by system version:

1if ([[[UIDevice currentDevice] systemVersion] compare:@"7.0"
2                                              options:NSNumericSearch] != NSOrderedAscending) {
3    NSLog(@"Running on iOS 7 or later");
4} else {
5    NSLog(@"Running on iOS 6");
6}

The key idea is compatibility coding, not trying to force an unsupported SDK combination.

When You Truly Need the Old SDK

If a project genuinely must be built and tested with the real iOS 6 SDK, the more reliable historical answer was to keep an older Xcode installation, often Xcode 4.6.x, alongside Xcode 5. Developers used separate app bundles, separate machines, or virtualized environments to avoid mixing toolchains.

That approach preserved the actual SDK, simulator, and build tools that belonged together. It was heavier operationally, but it was much more predictable than patching files into Xcode 5 and hoping the environment behaved like an older release.

Why Manual SDK Copying Was Fragile

Unsupported SDK copying created several risks:

• simulator images might not match the SDK
• build settings could reference missing tools
• Interface Builder behavior might differ
• device builds might expose signing or linker problems later

Even when it "worked," it was usually brittle enough that teams could not depend on it for long-term maintenance.

Common Pitfalls

• Confusing "supporting iOS 6 as a deployment target" with "needing the iOS 6 SDK."
• Copying SDK files manually and assuming that makes Xcode 5 fully compatible.
• Failing to guard newer APIs when running on older devices.
• Testing only compilation and not simulator or real-device behavior.
• Building workflow assumptions around an unsupported toolchain combination.

Summary

• Xcode 5 did not officially support installing the iOS 6 SDK as a normal setup.
• Manual SDK copying was an unsupported workaround and often fragile.
• In most cases, the better solution was to use Xcode 5 with an iOS 6 deployment target.
• Runtime checks let one codebase support both older and newer iOS versions.
• If you truly needed the real iOS 6 SDK, keeping an older Xcode version was the safer path.