gauche-xz-info.diff

--- Gauche-0.9.1.orig/lib/gauche/interactive/info.scm
+++ Gauche-0.9.1/lib/gauche/interactive/info.scm
@@ -84,7 +84,8 @@
                             :pred (lambda (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"))))
         (errorf "couldn't find info file ~s in paths: ~s" *info-file* paths))
     ))
 
--- Gauche-0.9.1.orig/lib/text/info.scm
+++ Gauche-0.9.1/lib/text/info.scm
@@ -63,6 +63,7 @@
 ;; Find gunzip location
 (define gunzip (find-file-in-paths "gunzip"))
 (define bzip2  (find-file-in-paths "bzip2"))
+(define xz     (find-file-in-paths "xz"))
 
 ;; Read an info file FILE, and returns a list of strings splitted by ^_ (#\x1f)
 ;; If FILE is not found, look for compressed one.
@@ -74,6 +75,8 @@
            (with-input-from-process #`",gunzip -c ,file" 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
    (lambda ()