Attached is a patch that reworks the output formats to better fit the stream 
width.

A new macro 'compatfmt is added that strips out commands that are not supported 
by Genera.

Regards
Douglas Crosher
diff --git a/asdf.lisp b/asdf.lisp
index 09c9f50..d73fe08 100755
--- a/asdf.lisp
+++ b/asdf.lisp
@@ -68,6 +68,27 @@
 
 (in-package :asdf)
 
+
+;;; Strip out formating that is not supported on Genera.
+(defmacro compatfmt (format)
+  #-genera format
+  #+genera
+  (let ((r '(("~@<" . "")
+            ("; ~@;" . "; ")
+            ("~3i~_" . "")
+            ("~@:>" . "")
+            ("~:>" . "")
+            )))
+    (dolist (i r)
+      (loop
+          (let ((found (search (car i) format)))
+            (unless found
+              (return))
+            (setf format (concatenate 'simple-string (subseq format 0 found)
+                                      (cdr i)
+                                      (subseq format (+ found (length (car 
i)))))))))
+    format))
+
 ;;;; Create packages in a way that is compatible with hot-upgrade.
 ;;;; See https://bugs.launchpad.net/asdf/+bug/485687
 ;;;; See more near the end of the file.
@@ -90,8 +111,8 @@
     (unless (and existing-asdf already-there)
       (when existing-asdf
         (format *trace-output*
-         "~&; Upgrading ASDF ~@[from version ~A ~]to version ~A~%"
-         existing-version asdf-version))
+               (compatfmt "~&~@<; ~@;Upgrading ASDF ~@[from version ~A ~]to 
version ~A~@:>~%")
+               existing-version asdf-version))
       (labels
           ((present-symbol-p (symbol package)
              (member (nth-value 1 (find-sym symbol package)) '(:internal 
:external)))
@@ -431,7 +452,7 @@ and NIL NAME, TYPE and VERSION components"
          (and (consp directory) (member (first directory) '(:absolute 
:relative))))
      directory)
     (t
-     (error "Unrecognized pathname directory component ~S" directory))))
+     (error (compatfmt "~@<Unrecognized pathname directory component ~S~@:>") 
directory))))
 
 (defun* merge-pathname-directory-components (specified defaults)
   (let ((directory (normalize-pathname-directory-component specified)))
@@ -512,12 +533,7 @@ and NIL NAME, TYPE and VERSION components"
 (defun* last-char (s)
   (and (stringp s) (plusp (length s)) (char s (1- (length s)))))
 
-(defun* errfmt (out format-string &rest format-args)
-  (declare (dynamic-extent format-args))
-  (apply #'format out
-         #-genera (format nil "~~@<~A~~:>" format-string) #+genera 
format-string
-         format-args))
-
+         
 (defun* asdf-message (format-string &rest format-args)
   (declare (dynamic-extent format-args))
   (apply #'format *verbose-out* format-string format-args))
@@ -572,7 +588,7 @@ e.g., \(:file \"foo/bar\"\), which will be unpacked to 
relative
 pathnames."
   (check-type s string)
   (when (find #\: s)
-    (error "a portable ASDF pathname designator cannot include a #\: 
character: ~S" s))
+    (error (compatfmt "~@<A portable ASDF pathname designator cannot include a 
#\: character: ~3i~_~S~@:>") s))
   (let* ((components (split-string s :separator "/"))
          (last-comp (car (last components))))
     (multiple-value-bind (relative components)
@@ -580,7 +596,7 @@ pathnames."
             (if (equal (first-char s) #\/)
                 (progn
                   (when force-relative
-                    (error "absolute pathname designator not allowed: ~S" s))
+                    (error (compatfmt "~@<Absolute pathname designator not 
allowed: ~3i~_~S~@:>") s))
                   (values :absolute (cdr components)))
                 (values :relative nil))
           (values :relative components))
@@ -651,9 +667,9 @@ actually-existing directory."
    ((stringp pathspec)
     (ensure-directory-pathname (pathname pathspec)))
    ((not (pathnamep pathspec))
-    (error "Invalid pathname designator ~S" pathspec))
+    (error (compatfmt "~@<Invalid pathname designator ~S~@:>") pathspec))
    ((wild-pathname-p pathspec)
-    (error "Can't reliably convert wild pathname ~S" pathspec))
+    (error (compatfmt "~@<Can't reliably convert wild pathname ~3i~_~S~@:>") 
pathspec))
    ((directory-pathname-p pathspec)
     pathspec)
    (t
@@ -960,9 +976,8 @@ processed in order by OPERATE."))
            ((m module) added deleted plist &key)
          (declare (ignorable deleted plist))
          (when (or *asdf-verbose* *load-verbose*)
-           (asdf-message
-            #-genera "~&~@<; ~@; Updating ~A for ASDF ~A~@:>~%"
-            #+genera "~&; Updating ~A for ASDF ~A~%" m ,(asdf-version)))
+           (asdf-message (compatfmt "~&~@<; ~@;Updating ~A for ASDF ~A~@:>~%")
+                        m ,(asdf-version)))
          (when (member 'components-by-name added)
            (compute-module-components-by-name m))
          (when (typep m 'system)
@@ -1001,25 +1016,26 @@ processed in order by OPERATE."))
   ((format-control :initarg :format-control :reader format-control)
    (format-arguments :initarg :format-arguments :reader format-arguments))
   (:report (lambda (c s)
-               (apply #'errfmt s (format-control c) (format-arguments c)))))
+               (apply #'format s (format-control c) (format-arguments c)))))
 
 (define-condition load-system-definition-error (system-definition-error)
   ((name :initarg :name :reader error-name)
    (pathname :initarg :pathname :reader error-pathname)
    (condition :initarg :condition :reader error-condition))
   (:report (lambda (c s)
-            (errfmt s "Error while trying to load definition for system ~A 
from pathname ~A: ~A"
+            (format s (compatfmt "~@<Error while trying to load definition for 
system ~A from pathname ~A: ~3i~_~A~@:>")
                     (error-name c) (error-pathname c) (error-condition c)))))
 
 (define-condition circular-dependency (system-definition-error)
   ((components :initarg :components :reader circular-dependency-components))
   (:report (lambda (c s)
-            (errfmt s "Circular dependency: ~S" 
(circular-dependency-components c)))))
+            (format s (compatfmt "~@<Circular dependency: ~3i~_~S~@:>")
+                    (circular-dependency-components c)))))
 
 (define-condition duplicate-names (system-definition-error)
   ((name :initarg :name :reader duplicate-names-name))
   (:report (lambda (c s)
-            (errfmt s "Error while defining system: multiple components are 
given same name ~A"
+            (format s (compatfmt "~@<Error while defining system: multiple 
components are given same name ~A~@:>")
                     (duplicate-names-name c)))))
 
 (define-condition missing-component (system-definition-error)
@@ -1040,7 +1056,7 @@ processed in order by OPERATE."))
   ((component :reader error-component :initarg :component)
    (operation :reader error-operation :initarg :operation))
   (:report (lambda (c s)
-               (errfmt s "erred while invoking ~A on ~A"
+               (format s (compatfmt "~@<Error while invoking ~A on ~A~@:>")
                        (error-operation c) (error-component c)))))
 (define-condition compile-error (operation-error) ())
 (define-condition compile-failed (compile-error) ())
@@ -1052,14 +1068,14 @@ processed in order by OPERATE."))
    (format :reader condition-format :initarg :format)
    (arguments :reader condition-arguments :initarg :arguments :initform nil))
   (:report (lambda (c s)
-               (errfmt s "~? (will be skipped)"
+               (format s (compatfmt "~@<~? (will be skipped)~@:>")
                        (condition-format c)
                        (list* (condition-form c) (condition-location c)
                               (condition-arguments c))))))
 (define-condition invalid-source-registry (invalid-configuration warning)
-  ((format :initform "invalid source registry ~S~@[ in ~S~]~@{ ~@?~}")))
+  ((format :initform (compatfmt "~@<Invalid source registry ~S~@[ in ~S~]~@{ 
~@?~}~@:>"))))
 (define-condition invalid-output-translation (invalid-configuration warning)
-  ((format :initform "invalid asdf output-translation ~S~@[ in ~S~]~@{ 
~@?~}")))
+  ((format :initform (compatfmt "~@<Invalid asdf output-translation ~S~@[ in 
~S~]~@{ ~@?~}~@:>"))))
 
 (defclass component ()
   ((name :accessor component-name :initarg :name :documentation
@@ -1123,7 +1139,7 @@ processed in order by OPERATE."))
 ;;;; methods: conditions
 
 (defmethod print-object ((c missing-dependency) s)
-  (format s "~A, required by ~A"
+  (format s (compatfmt "~@<~A, required by ~A~@:>")
           (call-next-method c nil) (missing-required-by c)))
 
 (defun* sysdef-error (format &rest arguments)
@@ -1133,13 +1149,13 @@ processed in order by OPERATE."))
 ;;;; methods: components
 
 (defmethod print-object ((c missing-component) s)
-  (format s "component ~S not found~@[ in ~A~]"
+  (format s (compatfmt "~@<Component ~S not found~@[ in ~A~]~@:>")
           (missing-requires c)
           (when (missing-parent c)
             (coerce-name (missing-parent c)))))
 
 (defmethod print-object ((c missing-component-of-version) s)
-  (format s "component ~S does not match version ~A~@[ in ~A~]"
+  (format s (compatfmt "~@<Component ~S does not match version ~A~@[ in 
~A~]~@:>")
           (missing-requires c)
           (missing-version c)
           (when (missing-parent c)
@@ -1199,7 +1215,7 @@ processed in order by OPERATE."))
              (component-relative-pathname component)
              (pathname-directory-pathname (component-parent-pathname 
component)))))
         (unless (or (null pathname) (absolute-pathname-p pathname))
-          (error "Invalid relative pathname ~S for component ~S"
+          (error (compatfmt "~@<Invalid relative pathname ~S for component 
~S~@:>")
                  pathname (component-find-path component)))
         (setf (slot-value component 'absolute-pathname) pathname)
         pathname)))
@@ -1268,7 +1284,7 @@ of which is a system object.")
     (component (component-name name))
     (symbol (string-downcase (symbol-name name)))
     (string name)
-    (t (sysdef-error "invalid component designator ~A" name))))
+    (t (sysdef-error (compatfmt "~@<Invalid component designator: 
~3i~_~A~@:>") name))))
 
 (defun* system-registered-p (name)
   (gethash (coerce-name name) *defined-systems*))
@@ -1361,8 +1377,8 @@ Going forward, we recommend new users should be using the 
source-registry.
                         (restart-case
                             (let* ((*print-circle* nil)
                                    (message
-                                    (errfmt nil
-                                            "While searching for system ~S: ~S 
evaluated to ~S which is not a directory."
+                                    (format nil
+                                            (compatfmt "~@<While searching for 
system ~S: ~3i~_~S evaluated to ~S which is not a directory.~@:>")
                                             system dir defaults)))
                               (error message))
                           (remove-entry-from-registry ()
@@ -1370,7 +1386,7 @@ Going forward, we recommend new users should be using the 
source-registry.
                             (push dir to-remove))
                           (coerce-entry-to-directory ()
                             :report (lambda (s)
-                                     (errfmt s "Coerce entry to ~a, replace ~a 
and continue."
+                                     (format s (compatfmt "~@<Coerce entry to 
~a, replace ~a and continue.~@:>")
                                              (ensure-directory-pathname 
defaults) dir))
                             (push (cons dir (ensure-directory-pathname 
defaults)) to-replace))))))))
         ;; cleanup
@@ -1406,7 +1422,7 @@ Going forward, we recommend new users should be using the 
source-registry.
   (or (and pathname (probe-file* pathname) (file-write-date pathname))
       (progn
         (when (and pathname *asdf-verbose*)
-          (warn "Missing FILE-WRITE-DATE for ~S: treating it as zero."
+          (warn (compatfmt "~@<Missing FILE-WRITE-DATE for ~S, treating it as 
zero.~@:>")
                 pathname))
         0)))
 
@@ -1423,9 +1439,8 @@ Going forward, we recommend new users should be using the 
source-registry.
                                 :name name :pathname pathname
                                 :condition condition))))
            (let ((*package* package))
-             (asdf-message
-              #-genera "~&~@<; ~@;Loading system definition from ~A into 
~A~@:>~%"
-              #+genera "~&; Loading system definition from ~A into ~A~%" 
pathname package)
+             (asdf-message (compatfmt "~&~@<; ~@;Loading system definition 
from ~A into ~A~@:>~%")
+                          pathname package)
              (load pathname)))
       (delete-package package))))
 
@@ -1452,7 +1467,7 @@ Going forward, we recommend new users should be using the 
source-registry.
 (defun* register-system (name system)
   (setf name (coerce-name name))
   (assert (equal name (component-name system)))
-  (asdf-message "~&; Registering ~A~%" system)
+  (asdf-message (compatfmt "~&~@<; ~@;Registering ~3i~_~A~@:>~%") system)
   (setf (gethash name *defined-systems*) (cons (get-universal-time) system)))
 
 (defun* find-system-fallback (requested fallback &rest keys &key source-file 
&allow-other-keys)
@@ -1792,7 +1807,7 @@ recursive calls to traverse.")
                              required-op required-c required-v))
       (retry ()
         :report (lambda (s)
-                 (errfmt s "Retry loading component ~S." required-c))
+                 (format s "~@<Retry loading component ~3i~_~S.~@:>" 
required-c))
         :test
         (lambda (c)
          (or (null c)
@@ -1836,7 +1851,7 @@ recursive calls to traverse.")
                           (when (find (second d) *features* :test 
'string-equal)
                             (dep op (third d) nil)))
                          (t
-                          (error "Bad dependency ~a.  Dependencies must be 
(:version <version>), (:feature <feature> [version]), or a name" d))))))
+                          (error (compatfmt "~@<Bad dependency ~a.  
Dependencies must be (:version <version>), (:feature <feature> [version]), or a 
name.~@:>") d))))))
            flag))))
 
 (defvar *visit-count* 0) ; counter that allows to sort nodes from 
operation-visited-nodes
@@ -1961,7 +1976,7 @@ recursive calls to traverse.")
 
 (defmethod perform ((operation operation) (c source-file))
   (sysdef-error
-   "required method PERFORM not implemented for operation ~A, component ~A"
+   (compatfmt "~@<Required method PERFORM not implemented for operation ~A, 
component ~A~@:>")
    (class-of operation) (class-of c)))
 
 (defmethod perform ((operation operation) (c module))
@@ -1972,7 +1987,8 @@ recursive calls to traverse.")
   (asdf-message "~&;;; ~A~%" (operation-description operation component)))
 
 (defmethod operation-description (operation component)
-  (format nil "~A on component ~S" (class-of operation) (component-find-path 
component)))
+  (format nil (compatfmt "~@<~A on component ~S~@:>")
+         (class-of operation) (component-find-path component)))
 
 ;;;; -------------------------------------------------------------------------
 ;;;; compile-op
@@ -2022,14 +2038,14 @@ recursive calls to traverse.")
       (when warnings-p
         (case (operation-on-warnings operation)
           (:warn (warn
-                  "COMPILE-FILE warned while performing ~A on ~A."
+                  (compatfmt "~@<COMPILE-FILE warned while performing ~A on 
~A.~@:>")
                   operation c))
           (:error (error 'compile-warned :component c :operation operation))
           (:ignore nil)))
       (when failure-p
         (case (operation-on-failure operation)
           (:warn (warn
-                  "COMPILE-FILE failed while performing ~A on ~A."
+                  (compatfmt "~@<COMPILE-FILE failed while performing ~A on 
~A.~@:>")
                   operation c))
           (:error (error 'compile-failed :component c :operation operation))
           (:ignore nil)))
@@ -2131,7 +2147,8 @@ recursive calls to traverse.")
 
 (defmethod operation-description ((operation load-op) component)
   (declare (ignorable operation))
-  (format nil "loading component ~S" (component-find-path component)))
+  (format nil (compatfmt "~@<Loading component: ~3i~_~S~@:>")
+         (component-find-path component)))
 
 
 ;;;; -------------------------------------------------------------------------
@@ -2174,7 +2191,8 @@ recursive calls to traverse.")
 
 (defmethod operation-description ((operation load-source-op) component)
   (declare (ignorable operation))
-  (format nil "loading component ~S" (component-find-path component)))
+  (format nil (compatfmt "~@<Loading component: ~3i~_~S~@:>")
+         (component-find-path component)))
 
 
 ;;;; -------------------------------------------------------------------------
@@ -2225,11 +2243,12 @@ recursive calls to traverse.")
               (retry ()
                 :report
                 (lambda (s)
-                 (errfmt s "Retry ~A." (operation-description op component))))
+                 (format s (compatfmt "~@<Retry ~A.~@:>")
+                         (operation-description op component))))
               (accept ()
                 :report
                 (lambda (s)
-                 (errfmt s "Continue, treating ~A as having been successful."
+                 (format s (compatfmt "~@<Continue, treating ~A as having been 
successful.~@:>")
                          (operation-description op component)))
                 (setf (gethash (type-of op)
                                (component-operation-times component))
@@ -2386,7 +2405,7 @@ Returns the new tree (which probably shares structure 
with the old one)"
 
 (defun* sysdef-error-component (msg type name value)
   (sysdef-error (concatenate 'string msg
-                             "~&The value specified for ~(~A~) ~A is ~S")
+                             (compatfmt "~&~@<The value specified for ~(~A~) 
~A is ~S~@:>"))
                 type name value))
 
 (defun* check-component-input (type name weakly-depends-on
@@ -2717,13 +2736,13 @@ located."
                (t (apply #'warn fstring args)
                   "unknown"))))
     (let ((lisp (maybe-warn (implementation-type)
-                            "No implementation feature found in ~a."
+                            (compatfmt "~@<No implementation feature found in 
~a.~@:>")
                             *implementation-features*))
           (os   (maybe-warn (first-feature *os-features*)
-                            "No os feature found in ~a." *os-features*))
+                            (compatfmt "~@<No OS feature found in ~a.~@:>") 
*os-features*))
           (arch (or #-clisp
                     (maybe-warn (first-feature *architecture-features*)
-                                "No architecture feature found in ~a."
+                                (compatfmt "~@<No architecture feature found 
in ~a.~@:>")
                                 *architecture-features*)))
           (version (maybe-warn (lisp-version-string)
                                "Don't know how to get Lisp implementation 
version.")))
@@ -2823,14 +2842,15 @@ located."
     :finally
     (unless (= inherit 1)
       (report-invalid-form invalid-form-reporter
-             :arguments (list "One and only one of ~S or ~S is required"
+             :arguments (list (compatfmt "~@<One and only one of ~S or ~S is 
required.~@:>")
                               :inherit-configuration 
:ignore-inherited-configuration)))
     (return (nreverse x))))
 
 (defun* validate-configuration-file (file validator &key description)
   (let ((forms (read-file-forms file)))
     (unless (length=n-p forms 1)
-      (error "One and only one form allowed for ~A. Got: ~S~%" description 
forms))
+      (error (compatfmt "~@<One and only one form allowed for ~A. Got: 
~3i~_~S~@:>~%")
+            description forms))
     (funcall validator (car forms) :location file)))
 
 (defun* hidden-file-p (pathname)
@@ -2951,7 +2971,7 @@ with a different configuration, so the configuration 
would be re-read then."
          (d (if (or (pathnamep x) (not directory)) r 
(ensure-directory-pathname r)))
          (s (if (or (pathnamep x) (not wilden)) d (wilden d))))
     (when (and (absolute-pathname-p s) (not (pathname-match-p s (wilden 
super))))
-      (error "pathname ~S is not relative to ~S" s super))
+      (error (compatfmt "~@<Pathname ~S is not relative to ~S~@:>") s super))
     (merge-pathnames* s super)))
 
 (defvar *here-directory* nil
@@ -2993,7 +3013,7 @@ directive.")
                 (wilden r)
                 r)))
     (unless (absolute-pathname-p s)
-      (error "Not an absolute pathname ~S" s))
+      (error (compatfmt "~@<Not an absolute pathname: ~3i~_~S~@:>") s))
     s))
 
 (defun* resolve-location (x &key directory wilden)
@@ -3065,7 +3085,7 @@ directive.")
     ((or (null string) (equal string ""))
      '(:output-translations :inherit-configuration))
     ((not (stringp string))
-     (error "environment string isn't: ~S" string))
+     (error (compatfmt "~@<Environment string isn't: ~3i~_~S~@:>") string))
     ((eql (char string 0) #\")
      (parse-output-translations-string (read-from-string string) :location 
location))
     ((eql (char string 0) #\()
@@ -3085,7 +3105,8 @@ directive.")
            (setf source nil))
           ((equal "" s)
            (when inherit
-             (error "only one inherited configuration allowed: ~S" string))
+             (error (compatfmt "~@<Only one inherited configuration allowed: 
~3i~_~S~@:>")
+                   string))
            (setf inherit t)
            (push :inherit-configuration directives))
           (t
@@ -3093,7 +3114,8 @@ directive.")
         (setf start (1+ i))
         (when (> start end)
           (when source
-            (error "Uneven number of components in source to destination 
mapping ~S" string))
+            (error (compatfmt "~@<Uneven number of components in source to 
destination mapping: ~3i~_~S~@:>")
+                  string))
           (unless inherit
             (push :ignore-inherited-configuration directives))
           (return `(:output-translations ,@(nreverse directives)))))))))
@@ -3244,7 +3266,7 @@ effectively disabling the output translation facility."
     ((eq destination t)
      path)
     ((not (pathnamep destination))
-     (error "invalid destination"))
+     (error "Invalid destination"))
     ((not (absolute-pathname-p destination))
      (translate-pathname path absolute-source (merge-pathnames* destination 
root)))
     (root
@@ -3575,7 +3597,7 @@ with a different configuration, so the configuration 
would be re-read then."
     ((or (null string) (equal string ""))
      '(:source-registry :inherit-configuration))
     ((not (stringp string))
-     (error "environment string isn't: ~S" string))
+     (error (compatfmt "~@<Environment string isn't: ~3i~_~S~@:>") string))
     ((find (char string 0) "\"(")
      (validate-source-registry-form (read-from-string string) :location 
location))
     (t
@@ -3589,7 +3611,8 @@ with a different configuration, so the configuration 
would be re-read then."
         (cond
          ((equal "" s) ; empty element: inherit
           (when inherit
-            (error "only one inherited configuration allowed: ~S" string))
+            (error (compatfmt "~@<Only one inherited configuration allowed: 
~3i~_~S~@:>")
+                  string))
           (setf inherit t)
           (push ':inherit-configuration directives))
          ((ends-with s "//")
@@ -3785,7 +3808,7 @@ with a different configuration, so the configuration 
would be re-read then."
       ((style-warning #'muffle-warning)
        (missing-component (constantly nil))
        (error #'(lambda (e)
-                  (errfmt *error-output* "ASDF could not load ~(~A~) because 
~A.~%"
+                  (format *error-output* (compatfmt "~@<ASDF could not load 
~(~A~) because ~A.~@:>~%")
                           name e))))
     (let ((*verbose-out* (make-broadcast-stream))
            (system (find-system (string-downcase name) nil)))
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