A base Makefile for compiling swift targeted for iOS without using XCode

Makefile

# Adapted from http://vojtastavik.com/2018/10/15/building-ios-app-without-xcode/

SYS_BASE := /usr/local
SYS_LIB := $(SYS_BASE)/lib
SYS_INCLUDE := $(SYS_BASE)/include

ORGANIZATION := # Organization Name 

NAME := # App Name 
BUNDLE := $(NAME).app
BUNDLE_ID := com.$(ORGANIZATION).$(NAME)
BUNDLE_PLIST := $(BUNDLE)/Info.plist
BUNDLE_BIN := $(LOCAL_BASE)/MacOS
BUNDLE_EXECUTABLE := $(BUNDLE_BIN)/$(NAME)
BUNDLE_STORYBOARDS := $(BUNDLE)/Base.lproj

LOCAL_BASE := . 
LOCAL_SRC := $(LOCAL_BASE)/src
LOCAL_BIN := $(LOCAL_BASE)/bin 
LOCAL_EXAMPLES := $(LOCAL_BASE)/examples

SIMULATOR := x86_64-apple-ios12.0-simulator
IPHONE := arm64-apple-ios12.0
MACOS := # The default target is for macos, thus it can be left blank

SDK_SIMULATOR := $(shell xcrun --show-sdk-path --sdk iphonesimulator)
SDK_IPHONE := $(shell xcrun --show-sdk-path --sdk iphoneos)
SDK_MACOS := $(shell xcrun --show-sdk-path --sdk macosx)

SDK ?= SDK_SIMULATOR
TARGET ?= SIMULATOR 

SC := swiftc 
SFLAGS := -sdk $(SDK) -target $(TARGET) -emit-executable

STORYBOARDS := $(LOCAL_SRC)/Base.lproj/

SBC := ibtool
SBFLAGS := --compilation-directory $(BUNDLE_STORYBOARDS)

PLISTC := /usr/libexec/PlistBuddy
PLISTFLAGS := -c "Add :CFBundleExecutable string '$(NAME)'" \
	-c "Add :CFBundleIdentifier string '$(BUNDLE_ID)'" \
	-c "Add :CFBundleName string '$(NAME)'" \
	-c "Add :CFBundleInfoDictionaryVersion real 6.0"

run:
	open -a "Simulator.app"
	xcrun simctl install booted $(BUNDLE)
	xcrun simctl launch booted $(BUNDLE_ID)

build:
	mkdir -p $(BUNDLE) $(BUNDLE_BIN) $(BUNDLE_STORYBOARDS)
	$(SC) $(SFLAGS) $(LOCAL_SRC)/*.swift -o $(BUNDLE_EXECUTABLE) 
	ls $(LOCAL_STORYBOARDS)/*.storyboard | xargs -I"{}" -L 1 bash -c "$(SBC) {} $(SBFLAGS)"	
	cp $(LOCAL_SRC) $(BUNDLE_PLIST)
	$(PLISTC) $(PLISTFLAGS) $(BUNDLE_PLIST)

clean:
	rm -rf $(BUNDLE) $(LOCAL_BIN)