--- a/configure.ac
+++ b/configure.ac
@@ -345,7 +345,6 @@
 AC_CHECK_PROGS(INSTALL_INFO, install-info)
 AC_CHECK_TOOLS(AR, ar gar)
 AC_CHECK_PROGS(MAKEINFO, makeinfo)
-AC_CHECK_PROGS(GZIP_PROGRAM, gzip)
 
 if test -z "$MAKEINFO" -o -z "$GZIP_PROGRAM"; then
   build_doc="No (requires makeinfo and gzip to build documents)"
--- a/doc/Makefile.in
+++ b/doc/Makefile.in
@@ -19,7 +19,6 @@
 INSTALL_INFO = @INSTALL_INFO@
 MKINSTDIR    = $(top_srcdir)/mkinstalldirs
 MAKEINFO     = @MAKEINFO@
-GZIP_PROGRAM = @GZIP_PROGRAM@
 VERSION_INFO = @PACKAGE_STRING@
 PREPROCESSOR = $(top_srcdir)/lib/tools/docprep
 
@@ -61,7 +60,7 @@
 	texi html htmls dvi pdf info epub \
 	clean distclean maintainer-clean
 
-.SUFFIXES: .texi .html .info.gz .pdf .dvi .epub
+.SUFFIXES: .texi .html .info .pdf .dvi .epub
 
 all: info
 
@@ -77,7 +76,7 @@
 	    $(INSTALL_INFO) gauche-refj.info.gz "$(infodir)/dir" ; \
 	  fi; \
 	fi; \
-	if test -f gauche-refe.info.gz -o -f gauche-refj.info.gz; then \
+	if test -f gauche-refe.info -o -f gauche-refj.info; then \
 	  $(INSTALL_DATA) *.info* "$(DESTDIR)$(infodir)/"; \
 	fi
 
@@ -114,8 +113,8 @@
 %-draft/index.html : %.texi
 	$(MAKEDOC) htmls $< "$(MAKEINFO)" "Development HEAD DRAFT"
 
-%.info.gz : %.texi
-	$(MAKEDOC) info $< "$(MAKEINFO)" "$(GZIP_PROGRAM)"
+%.info : %.texi
+	$(MAKEDOC) info $< "$(MAKEINFO)"
 
 %.pdf : %.texi
 	$(MAKEDOC) pdf $< "$(MAKEINFO)"
@@ -137,7 +136,7 @@
 htmls-draft : gauche-refe-draft/index.html gauche-refj-draft/index.html
 dvi : gauche-refe.dvi gauche-refj.dvi
 pdf : gauche-refe.pdf gauche-refj.pdf
-info : gauche-refe.info.gz gauche-refj.info.gz
+info : gauche-refe.info gauche-refj.info
 epub : gauche-refe.epub gauche-refj.epub
 
 gauche-refe.texi : $(TEXIS) $(PREPROCESSOR)
--- a/doc/makedoc.scm
+++ b/doc/makedoc.scm
@@ -16,7 +16,7 @@
    [gauche.sys.setenv (sys-putenv "LANG=C")]
    [else])
   (if (match (cdr args)
-        [("info" input makeinfo gzip)     (do-info input makeinfo gzip)]
+        [("info" input makeinfo)          (do-info input makeinfo)]
         [("html" input makeinfo)          (do-html input makeinfo)]
         [("htmls" input makeinfo version) (do-htmls input makeinfo version)]
         [("pdf" input makeinfo)           (do-pdf input makeinfo)]
@@ -28,7 +28,7 @@
 (define (usage)
   (print "Usage: gosh makedoc.scm command args ...")
   (print "Valid commands (and args):")
-  (print "  info input MAKEINFO GZIP            - generate info doc")
+  (print "  info input MAKEINFO                 - generate info doc")
   (print "  html input MAKEINFO                 - generate single html")
   (print "  htmls input MAKEINFO VERSION-STRING - generate html files in subdir")
   (print "  pdf input MAKEINFO                  - generate pdf")
@@ -57,14 +57,11 @@
         (warn "makeinfo version ~a or greater is required, but ~a's \
                version is ~a.  Skipping.\n" min-version makeinfo vers)))))
 
-(define (do-info input makeinfo gzip)
+(define (do-info input makeinfo)
   (define info (path-swap-extension input "info"))
   (or (string-null? makeinfo)
-      (string-null? gzip)
       (not (check-makeinfo-version makeinfo "5.0"))
-      (and (do-process (make-cmd `(,makeinfo ,input)))
-           (begin (remove-files (glob #"~|info|*.gz"))
-                  (do-process (make-cmd `(,gzip "-n" ,info ,@(glob #"~|info|-[0-9]*"))))))))
+      (and (do-process (make-cmd `(,makeinfo ,input))))))
 
 (define (do-html input makeinfo)
   (or (string-null? makeinfo)