${PHANTOMJS} ${PROG} ${PHANTOMJS_URL} ${IMAGES}/tmp.$$file.png ${SCREENSHOT_WIDTH_HEIGHT} ${TIMEOUT}; \
mv -f ${IMAGES}/tmp.$$file.png ${IMAGES}/$$file.png
-screenshots:
+screenshots: clean
for i in $$(cat url.txt); do \
make PHANTOMJS_URL="$$i" TIMEOUT=4 screenshot; \
done; wait