diff --git a/mes/module/nyacc/lang/c99/parser.mes b/mes/module/nyacc/lang/c99/parser.mes
index 1a9aaf73..9fbb5fd1 100644
--- a/mes/module/nyacc/lang/c99/parser.mes
+++ b/mes/module/nyacc/lang/c99/parser.mes
@@ -1,7 +1,7 @@
 ;;; -*-scheme-*-
 
 ;;; GNU Mes --- Maxwell Equations of Software
-;;; Copyright © 2016,2017 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;; Copyright © 2016,2017,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of GNU Mes.
 ;;;
@@ -35,5 +35,6 @@
 (mes-use-module (nyacc lang sx-util))
 (mes-use-module (nyacc lang util))
 (mes-use-module (nyacc lang c99 cpp))
+(mes-use-module (nyacc lang c99 util))
 
 (include-from-path "nyacc/lang/c99/parser.scm")
diff --git a/mes/module/nyacc/lang/c99/util.mes b/mes/module/nyacc/lang/c99/util.mes
new file mode 100644
index 00000000..b4e24885
--- /dev/null
+++ b/mes/module/nyacc/lang/c99/util.mes
@@ -0,0 +1,45 @@
+;;; -*-scheme-*-
+
+;;; GNU Mes --- Maxwell Equations of Software
+;;; Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;;;
+;;; This file is part of GNU Mes.
+;;;
+;;; GNU Mes is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Mes is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(mes-use-module (mes guile))
+(mes-use-module (mes catch))
+(mes-use-module (mes fluids))
+(mes-use-module (mes pretty-print))
+(mes-use-module (mes optargs))
+(mes-use-module (srfi srfi-1))
+(mes-use-module (srfi srfi-9))
+(mes-use-module (sxml xpath))
+
+;; FIXME: Nyacc 0.93.0:
+;; FIXME: (mes-use-module (srfi srfi-2))
+;; FIXME: (mes-use-module (sxml fold))
+;; FIXME: (ice-9 popen)
+;; FIXME: (ice-9 rdelim)
+(define (export . rest) #t)
+(define (close-port port) #t)
+
+(mes-use-module (nyacc lang util))
+(mes-use-module (nyacc lang sx-util))
+
+(include-from-path "nyacc/lang/c99/util.scm")
diff --git a/module/mescc/compile.scm b/module/mescc/compile.scm
index 74a2deff..39b352c0 100644
--- a/module/mescc/compile.scm
+++ b/module/mescc/compile.scm
@@ -1713,6 +1713,10 @@
       ((asm-expr ,gnuc (,null ,arg0 . string))
        (append-text info (wrap-as (asm->m1 arg0))))
 
+      ;; Nyacc 0.90.2
+      ((asm-expr ,gnuc (string ,arg0))
+       (append-text info (wrap-as (asm->m1 arg0))))
+
       ((expr-stmt (fctn-call (p-expr (ident ,name)) (expr-list . ,expr-list)))
        (if (equal? name "asm") (let ((arg0 (cadr (cadar expr-list))))
                                  (append-text info (wrap-as (asm->m1 arg0))))
diff --git a/module/mescc/preprocess.scm b/module/mescc/preprocess.scm
index c7327a44..b8c38aa0 100644
--- a/module/mescc/preprocess.scm
+++ b/module/mescc/preprocess.scm
@@ -40,7 +40,7 @@
        '(("0.85.3" (1 2 3))
          ("0.86.0" (1 2 3)))
        *nyacc-version*)
-      '(1 2 3)))
+      '((1 2 3))))
 
 (define (progress o)
   (when (and o (getenv "NYACC_DEBUG"))
@@ -114,6 +114,7 @@
 
 (define (ast-strip-comment o)
   (pmatch o
+    ((@ (comment . ,comment)) #f) ; Nyacc 0.90.2/0.93.0?
     ((comment . ,comment) #f)
     (((comment . ,comment) . ,t) (filter-map ast-strip-comment t))
     (((comment . ,comment) . ,cdr) cdr)