Only try to run install-info if we've built info files

Author: d-torrance

M2/Macaulay2/packages/Makefile.in

@@ -90,8 +90,10 @@ unmark-$1: ; rm -rf  @pre_libm2dir@/$1/.installed
 	@echo "make: Leaving directory \`$(shell pwd)/$1-temporary'"
 	ls -l $1-temporary
 	rm -rf $1-temporary
+ifeq ($(filter info, @DOCUMENTATION@), info)
 	if [ -e @pre_infodir@/$1.info ]; then \
 		@INSTALL_INFO@ --info-dir=@pre_infodir@ @pre_infodir@/$1.info; fi
+endif
 	@ [ "${IgnoreExampleErrors}" = true -o -f $$@ ] || (echo error: file $$@ not made by installPackage >&2; false)
 check-info::@pre_infodir@/$1.info.errors
 @pre_infodir@/$1.info.errors: @pre_infodir@/$1.info