Explicit Python2.7 link.

Makefile

@@ -9,6 +9,8 @@ TARGETS = csrankings.js generated-author-info.csv
 
 .PHONY: home-pages scholar-links fix-affiliations update-dblp clean-dblp download-dblp shrink-dblp
 
+PYTHON = python2.7
+
 all: generated-author-info.csv csrankings.js # fix-affiliations home-pages scholar-links
 
 clean:
@@ -44,31 +46,31 @@ shrink-dblp:
 
 faculty-affiliations.csv homepages.csv scholar.csv: csrankings.csv
 	@echo "Splitting main datafile (csrankings.csv)."
-	@python util/split-csv.py
+	@$(PYTHON) util/split-csv.py
 # @echo "Sorting."
-# @python util/merge-csv.py
+# @$(PYTHON) util/merge-csv.py
 #	@echo "Cleaning."
-#	@python util/clean-csrankings.py
+#	@$(PYTHON) util/clean-csrankings.py
 	@echo "Done."
 
 home-pages: faculty-affiliations.csv homepages.csv
 	@echo "Rebuilding home pages (homepages.csv)."
-	@python util/make-web-pages.py
+	@$(PYTHON) util/make-web-pages.py
 	@echo "Cleaning home pages."
-	@python util/clean-web-pages.py
+	@$(PYTHON) util/clean-web-pages.py
 	@mv homepages-sorted.csv homepages.csv
 	@echo "Done."
 
 scholar-links: faculty-affiliations.csv homepages.csv
 	@echo "Rebuilding Google Scholar links (scholar.csv)."
-	@python util/make-scholar-links.py
+	@$(PYTHON) util/make-scholar-links.py
 	@echo "Cleaning Scholar links."
-	@python util/clean-scholar-links.py
+	@$(PYTHON) util/clean-scholar-links.py
 	@echo "Done."
 
 fix-affiliations: faculty-affiliations.csv
 	@echo "Updating affiliations."
-	@python util/fix-affiliations.py | sort -k2 -t"," | uniq > /tmp/f1.csv
+	@$(PYTHON) util/fix-affiliations.py | sort -k2 -t"," | uniq > /tmp/f1.csv
 	@echo "name,affiliation" | cat - /tmp/f1.csv >  /tmp/f2.csv
 	@rm /tmp/f1.csv
 	@mv /tmp/f2.csv faculty-affiliations.csv