+INSTALL_PRELUDE = echo '@firstparagraphindent insert'
+
+# INSTALL file with old ASCII quotation marks (looks ugly on modern machines).
+INSTALL: install.texi
+ $(INSTALL_PRELUDE) | cat - $< > tmp.texi
+ $(MAKEINFO) --plaintext --no-validate tmp.texi > $@
+ rm -f tmp.texi
+
+# INSTALL file with ISO 646 or ISO 8859 quotation marks.
+INSTALL.ISO: install.texi
+ $(INSTALL_PRELUDE) | cat - $< > tmpi.texi
+ $(MAKEINFO) --plaintext --no-validate tmpi.texi \
+ | sed -e "s/\`\([^']*\)'/'\1'/g" > $@
+ rm -f tmpi.texi
+
+# INSTALL file wit ISO 10646 (Unicode) quotation marks.
+INSTALL.UTF-8: install.texi
+ $(INSTALL_PRELUDE) | cat - $< > tmpu.texi
+ $(MAKEINFO) --plaintext --no-validate tmpu.texi \
+ | sed -e "s/\`\([^']*\)'/‘\1’/g" > $@
+ rm -f tmpu.texi
+
+GNULIB_TEXI_FILES = $(filter-out maintain.texi make-stds.texi standards.texi,$(wildcard *.texi)) $(wildcard posix-headers/*.texi) $(wildcard posix-functions/*.texi) $(wildcard glibc-headers/*.texi) $(wildcard glibc-functions/*.texi)
+
+# Date of last update. Requires GNU date.
+updated-stamp: $(GNULIB_TEXI_FILES)
+ date -u -r `ls -t $^ | sed 1q` +"@set UPDATED %F %T" > $@
+