tricks to compile 2 pdf from 1 source file

wedding-invitation/Makefile

@@ -1,15 +1,21 @@
 DOC=thiep1
 INPUT=$(DOC).tex
-TARGET=$(DOC).pdf
+TARGET_EN=thiep_en
+TARGET_VI=thiep_vi
+TARGET=$(TARGET_EN).pdf $(TARGET_VI).pdf
 TEX=xelatex
-QR=qr.png
+QR=qrEvent_vi.png qrEvent_en.png
 
 default: $(TARGET)
 
-$(TARGET): $(INPUT) Makefile $(QR)
-	$(TEX) $< && $(TEX) $< 
+$(TARGET_EN).pdf: $(INPUT) Makefile $(QR)
+	$(TEX) --jobname=$(TARGET_EN) $< && $(TEX) --jobname=$(TARGET_EN) $< 
 
-$(QR): qrEvent_vi.txt
+$(TARGET_VI).pdf: $(INPUT) Makefile $(QR)
+	$(TEX) --jobname=$(TARGET_VI) "\def\ViFlag{}\input{$<}" && \
+		$(TEX) --jobname=$(TARGET_VI) "\def\ViFlag{}\input{$<}"
+
+$(QR): qrEvent_vi.txt qrEvent_en.txt
 	./qrGen.py
 
 clean: