Gave up on using Carthage's archive functionality with XCFrameworks.
diff --git a/Makefile b/Makefile
index 3506d7b..678b584 100644
--- a/Makefile
+++ b/Makefile
@@ -102,4 +102,4 @@
 
 
 carthage:
-	carthage build --archive --project-directory "$(SOURCE_DIR)" --no-skip-current --use-xcframeworks
+	carthage build --project-directory "$(SOURCE_DIR)" --no-skip-current --use-xcframeworks