diff --git a/Makefile b/Makefile
index c336205b..81501875 100644
--- a/Makefile
+++ b/Makefile
@@ -32,6 +32,21 @@ ifndef USE_NO_MD5
 endif
 	$(Q)$(MAKE) -C src
 
+universal_binary :
+	$(Q)$(MAKE) clean
+	$(Q)TARGET_ARCH="-target x86_64-apple-macos10.12" $(MAKE) all
+	$(Q)mv lib/libxlsxwriter.a     libxlsxwriter_x86_64.a
+	$(Q)mv lib/libxlsxwriter.dylib libxlsxwriter_x86_64.dylib
+
+	$(Q)$(MAKE) clean
+	$(Q)TARGET_ARCH="-target arm64-apple-macos11" $(MAKE) all
+	$(Q)mv lib/libxlsxwriter.a     lib/libxlsxwriter_arm64.a
+	$(Q)mv lib/libxlsxwriter.dylib lib/libxlsxwriter_arm64.dylib
+	$(Q)mv libxlsxwriter_x86_64.a libxlsxwriter_x86_64.dylib lib
+
+	$(Q)lipo -create -output lib/libxlsxwriter.a     lib/libxlsxwriter_x86_64.a     lib/libxlsxwriter_arm64.a
+	$(Q)lipo -create -output lib/libxlsxwriter.dylib lib/libxlsxwriter_x86_64.dylib lib/libxlsxwriter_arm64.dylib
+
 # Build the example programs.
 examples :
 	$(Q)$(MAKE) -C examples
diff --git a/src/Makefile b/src/Makefile
index 4d5f1068..8204e14c 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -148,7 +148,7 @@ ARCH = -m32
 endif
 
 $(LIBXLSXWRITER_SO) : $(SOBJS)
-	$(Q)$(CC) $(LDFLAGS) $(SOFLAGS) $(ARCH) -o $@ $(MINIZIP_SO) $(TMPFILEPLUS_SO) $(MD5_SO) $^ $(LIBS)
+	$(Q)$(CC) $(LDFLAGS) $(SOFLAGS) $(ARCH) $(TARGET_ARCH) -o $@ $(MINIZIP_SO) $(TMPFILEPLUS_SO) $(MD5_SO) $^ $(LIBS)
 
 # The test library.
 $(LIBXLSXWRITER_TO) : $(TOBJS)
@@ -159,10 +159,10 @@ test_compile : $(OBJS)
 
 # Targets for the object files.
 %.o  : %.c $(HDRS)
-	$(Q)$(CC) -I$(INC_DIR) $(CFLAGS) $(CXXFLAGS) -c $<
+	$(Q)$(CC) -I$(INC_DIR) $(CFLAGS) $(CXXFLAGS) $(TARGET_ARCH) -c $<
 
 %.so : %.c $(HDRS)
-	$(Q)$(CC) $(FPIC) -I$(INC_DIR) $(LDFLAGS) $(CFLAGS) $(CXXFLAGS) -c $< -o $@
+	$(Q)$(CC) $(FPIC) -I$(INC_DIR) $(LDFLAGS) $(CFLAGS) $(CXXFLAGS) $(TARGET_ARCH) -c $< -o $@
 
 %.to : %.c $(HDRS)
 	$(Q)$(CC) -g -O3 -DTESTING -I$(INC_DIR) $(CFLAGS) $(CXXFLAGS) -c $< -o $@
diff --git a/third_party/md5/Makefile b/third_party/md5/Makefile
index a50cbe22..b6329700 100644
--- a/third_party/md5/Makefile
+++ b/third_party/md5/Makefile
@@ -33,10 +33,10 @@ endif
 all: md5.o md5.so
 
 %.o  : %.c
-	$(Q)$(CC)         -c $(CFLAGS) $<
+	$(Q)$(CC)         -c $(CFLAGS) $(TARGET_ARCH) $<
 
 %.so : %.c
-	$(Q)$(CC) $(FPIC) -c $(CFLAGS) $< -o $@
+	$(Q)$(CC) $(FPIC) -c $(CFLAGS) $(TARGET_ARCH) $< -o $@
 
 clean:
 	$(Q)/bin/rm -f *.o *.so
diff --git a/third_party/minizip/Makefile b/third_party/minizip/Makefile
index 02f04c79..5251c3c3 100644
--- a/third_party/minizip/Makefile
+++ b/third_party/minizip/Makefile
@@ -40,10 +40,10 @@ endif
 all: ioapi.o zip.o  ioapi.so zip.so
 
 %.o  : %.c
-	$(Q)$(CC)         -c $(CFLAGS) $<
+	$(Q)$(CC)         -c $(CFLAGS) $(TARGET_ARCH) $<
 
 %.so : %.c
-	$(Q)$(CC) $(FPIC) -c $(CFLAGS) $< -o $@
+	$(Q)$(CC) $(FPIC) -c $(CFLAGS) $(TARGET_ARCH) $< -o $@
 
 clean:
 	$(Q)/bin/rm -f *.o *.so
diff --git a/third_party/tmpfileplus/Makefile b/third_party/tmpfileplus/Makefile
index da691cd7..b4c2db2d 100644
--- a/third_party/tmpfileplus/Makefile
+++ b/third_party/tmpfileplus/Makefile
@@ -33,10 +33,10 @@ endif
 all: tmpfileplus.o tmpfileplus.so
 
 %.o  : %.c
-	$(Q)$(CC)         -c $(CFLAGS) $<
+	$(Q)$(CC)         -c $(CFLAGS) $(TARGET_ARCH) $<
 
 %.so : %.c
-	$(Q)$(CC) $(FPIC) -c $(CFLAGS) $< -o $@
+	$(Q)$(CC) $(FPIC) -c $(CFLAGS) $(TARGET_ARCH) $< -o $@
 
 clean:
 	$(Q)/bin/rm -f *.o *.so