set R_INSTALL_TAR in etc/Renviron

com.oracle.truffle.r.native/run/Makefile

@@ -72,6 +72,8 @@ $(FASTR_BIN_DIR)/R: Makefile R.sh Rscript.sh Rscript_exec.sh
 	chmod +x $(FASTR_BIN_DIR)/R 
 	touch $(FASTR_ETC_DIR)/ldpaths
 	sed -e "s|\(R_LIBS_USER=.*-'\)\(.*\)'}|\1$(FASTR_R_HOME)/library'}|" < $(GNUR_HOME)/etc/Renviron > $(FASTR_ETC_DIR)/Renviron
+	# set R_INSTALL_TAR
+	ed $(FASTR_ETC_DIR)/Renviron < edREnviron
 	cp $(GNUR_HOME)/etc/Makeconf Makeconf.etc
 	ed Makeconf.etc < edMakeconf.etc
 	cp Makeconf.etc $(FASTR_ETC_DIR)/Makeconf

com.oracle.truffle.r.native/run/edRenviron

+/### Local/
+i
+R_INSTALL_TAR=${TAR}
+.
+w
+q