Prefer 'if-guile-version-below' to 'cond-expand'.

* gash/compat.scm: Use 'if-guile-version-below' over 'cond-expand'.
* gash/compat/textual-ports.scm: Ditto.

gash/compat.scm

@@ -57,13 +57,13 @@
       (and (integer? x) (exact? x))))
   #f)
 
-(cond-expand
-  ((and guile-2 (not guile-2.2))
-   (define* (setvbuf port mode #:optional size)
-     (let ((mode (match mode
-                   ('none _IONBF)
-                   ('line _IOLBF)
-                   ('block _IOFBF))))
-       ((@ (guile) setvbuf) port mode size)))
-   (export! setvbuf))
-  (else #f))
+(if-guile-version-below (2 2 0)
+  (begin
+    (define* (setvbuf port mode #:optional size)
+      (let ((mode (match mode
+                    ('none _IONBF)
+                    ('line _IOLBF)
+                    ('block _IOFBF))))
+        ((@ (guile) setvbuf) port mode size)))
+    (export! setvbuf))
+  #f)

gash/compat/textual-ports.scm

@@ -16,7 +16,8 @@
 ;;; You should have received a copy of the GNU General Public License
 ;;; along with Gash.  If not, see <http://www.gnu.org/licenses/>.
 
-(define-module (gash compat textual-ports))
+(define-module (gash compat textual-ports)
+  #:use-module (gash compat))
 
 ;;; Commentary:
 ;;;
@@ -25,20 +26,19 @@
 ;;;
 ;;; Code:
 
-(cond-expand
-  ((and guile-2 (not guile-2.2))
-   (use-modules (rnrs io ports))
-   (define (unget-char port char)
-     (unread-char char port))
-   (re-export get-char
-              get-line
-              get-string-all
-              lookahead-char)
-   (export unget-char))
-  (else
-   (use-modules (ice-9 textual-ports))
-   (re-export get-char
-              get-line
-              get-string-all
-              lookahead-char
-              unget-char)))
+(if-guile-version-below (2 2 0)
+  (begin
+    (use-modules (rnrs io ports))
+    (re-export get-char
+               get-line
+               get-string-all
+               lookahead-char)
+    (define-public (unget-char port char)
+      (unread-char char port)))
+  (begin
+    (use-modules (ice-9 textual-ports))
+    (re-export get-char
+               get-line
+               get-string-all
+               lookahead-char
+               unget-char)))