[BUG]: Build script for iOS not working with XCode 26

[anlun16]

Package version

3.0.0-pre.8

Environment

* OS: Mac OS Tahoe (26.0.1)
* Unity version: n/a
* Build target: iOS 26

Running the build script BuildScripts~/build_libwebrtc_ios.sh yields multiple errors on an M2 Mac with XCode 26. 
Starting with iOS 26, UIKit has a dependency to a new subframework UIUtilities, that may be causing this error.

Steps To Reproduce

1. Ensure build tools are up to date:
   Update XCode to version 26
   Update brew
   Upgrade brew packages
   Install cmake using brew
2. Run build script for ios:
   BuildScripts~/build_libwebrtc_ios.sh
3. After downloading dependencies and beginning the build, the script fails with multiple errors similar to this:

../src/third_party/llvm-build/Release+Asserts/bin/clang++ -MMD -MF obj/sdk/audio_session_objc/RTCAudioSession.o.d -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -DCR_XCODE_VERSION=2601 -DCR_CLANG_REVISION=\"llvmorg-17-init-12166-g7586aeab-3\" -D_DEBUG -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DWEBRTC_ENABLE_PROTOBUF=1 -DWEBRTC_STRICT_FIELD_TRIALS=0 -DWEBRTC_INCLUDE_INTERNAL_AUDIO_DEVICE -DRTC_ENABLE_VP9 -DRTC_DAV1D_IN_INTERNAL_DECODER_FACTORY -DWEBRTC_HAVE_SCTP -DWEBRTC_ARCH_ARM64 -DWEBRTC_HAS_NEON -DWEBRTC_LIBRARY_IMPL -DWEBRTC_ENABLE_AVX2 -DWEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS=0 -DWEBRTC_POSIX -DWEBRTC_MAC -DWEBRTC_IOS -DABSL_ALLOCATOR_NOTHROW=1 -I../src -Igen -I../src/third_party/abseil-cpp -I../src/sdk/objc -I../src/sdk/objc/base  -Wall -Wextra -Wimplicit-fallthrough -Wextra-semi -Wunreachable-code-aggressive -Wthread-safety -Wunguarded-availability -Wundeclared-selector -Wno-missing-field-initializers -Wno-unused-parameter -Wno-psabi -Wloop-analysis -Wno-unneeded-internal-declaration -Wenum-compare-conditional -Wno-ignored-pragma-optimize -Wno-deprecated-builtins -Wno-bitfield-constant-conversion -Wno-deprecated-this-capture -Wshadow -fno-delete-null-pointer-checks -fno-ident -fno-strict-aliasing -fstack-protector-strong -fcolor-diagnostics -fmerge-all-constants -fcrash-diagnostics-dir=../src/tools/clang/crashreports -mllvm -instcombine-lower-dbg-declare=0 -ffp-contract=off -target arm64-apple-ios12.0 -fno-global-isel -mno-outline -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__= -ffile-compilation-dir=. -no-canonical-prefixes -ftrivial-auto-var-init=pattern -O0 -fno-omit-frame-pointer -g2 -gdwarf-aranges -Xclang -debug-info-kind=limited -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS26.0.sdk -fvisibility=hidden -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -Wexit-time-destructors -Wglobal-constructors -Wno-shadow -Wctad-maybe-unsupported -Wc++11-narrowing -Wundef -Wunused-lambda-capture -Wimplicit-retain-self -Wstrict-overflow -Wmissing-field-initializers -Wimplicit-retain-self -Wno-undefined-bool-conversion -Wno-tautological-undefined-compare -std=c++17 -Wno-trigraphs -fobjc-call-cxx-cdtors -Xclang -fno-cxx-modules -fno-exceptions -fno-rtti -fvisibility-inlines-hidden -fobjc-arc -c ../src/sdk/objc/components/audio/RTCAudioSession.mm -o obj/sdk/audio_session_objc/RTCAudioSession.o
In file included from ../src/sdk/objc/components/audio/RTCAudioSession.mm:13:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS26.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIKit.h:9:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS26.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIKitCore.h:9:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS26.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIKitDefines.h:10:9: fatal error: 'UIUtilities/UIDefines.h' file not found

Current Behavior

Build fails despite verifying that prerequisites are installed.

Expected Behavior

Build succeeds.

Anything else?

No response

[owais-kali]

I am getting same error Xcode 26.3. The file "UIDefines.h" exist in "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS26.2.sdk/System/Library/SubFrameworks/UIUtilities.framework/Headers" but for some reason xcode compiler is not loading it.