diff --git a/Patches/Mtoc/libstuff.xcconfig b/Patches/Mtoc/libstuff.xcconfig
index 78871016de..ed98d5ba78 100644
--- a/Patches/Mtoc/libstuff.xcconfig
+++ b/Patches/Mtoc/libstuff.xcconfig
@@ -10,7 +10,7 @@
 
 // HEADER_SEARCH_PATHS includes the local toolchain headers in order to find
 // "llvm-c/lto.h"
-HEADER_SEARCH_PATHS = ${inherited} ${DT_TOOLCHAIN_DIR}/usr/local/include
+HEADER_SEARCH_PATHS = ${inherited} ${TOOLCHAIN_DIR}/usr/local/include
 
 // libstuff currently requires the LTO_SUPPORT macro to be defined in order to
 // compile support for LTO. This is built non-conditionally, and can probably
diff --git a/buildmtoc.sh b/buildmtoc.sh
index 8fc427f380..6a9bb5a876 100755
--- a/buildmtoc.sh
+++ b/buildmtoc.sh
@@ -183,6 +183,14 @@ fnCompileMtoc ()
     # Mtoc build
     local cmd logfile
     cd "$CCTOOLS_DIR"
+
+# Replace deprecated DT_TOOLCHAIN_DIR as a workaround for building in Xcode 15
+	xcodeapp=$(defaults read /Applications/Xcode.app/Contents/version.plist CFBundleShortVersionString)
+	if [[ $xcodeapp == 15.* ]]; then
+		sed -i '' 's/DT_TOOLCHAIN_DIR/TOOLCHAIN_DIR/g' "$CCTOOLS_DIR"/xcode/cctools.xcconfig
+		sed -i '' 's/DT_TOOLCHAIN_DIR/TOOLCHAIN_DIR/g' "$CCTOOLS_DIR"/xcode/libstuff.xcconfig
+		sed -i '' 's/DT_TOOLCHAIN_DIR/TOOLCHAIN_DIR/g' "$CCTOOLS_DIR"/xcode/strip.xcconfig
+	fi
     # Removal of _structs.h needed as a workaround for a bug in cctools-900 or above
     /bin/rm -f ./include/mach/i386/_structs.h
     echo "-  cctools-${CCTOOLS_VERSION} make mtoc..."