--- a/lib/gauche/interactive/info.scm

+++ b/lib/gauche/interactive/info.scm

@@ -113,7 +113,8 @@

                       :paths (get-info-paths)

                       :pred (^p (or (file-is-readable? p)

                                     (file-is-readable? #"~|p|.gz")

-                                    (file-is-readable? #"~|p|.bz2")))))

+                                    (file-is-readable? #"~|p|.bz2")

+                                    (file-is-readable? #"~|p|.xz")))))

 (define (handle-ambiguous-name entry-name)

   (let* ([keys (map x->string (hash-table-keys (~ (get-info)'index)))]

--- a/lib/text/info.scm

+++ b/lib/text/info.scm

@@ -67,6 +67,7 @@

 ;; Find bzip2 location

 (define bzip2  (find-file-in-paths "bzip2"))

+(define xz     (find-file-in-paths "xz"))

 (cond-expand

  [gauche.sys.zlib]

@@ -90,6 +91,8 @@

              (with-input-from-process #"~gzip -c -d ~|file|.gz" thunk)])]

           [(and bzip2 (file-exists? #"~|file|.bz2"))

            (with-input-from-process #"~bzip2 -c -d ~|file|.bz2" thunk)]

+          [(and xz (file-exists? #"~|file|.xz"))

+           (with-input-from-process #"~xz -c -d ~|file|.xz" thunk)]

           [else (error "can't find info file" file)]))

   (with-input-from-info

    (^[]