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-rw-r--r--src/guile/skribilo/engine/html.scm8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/guile/skribilo/engine/html.scm b/src/guile/skribilo/engine/html.scm
index 4a9f99f..42f18b2 100644
--- a/src/guile/skribilo/engine/html.scm
+++ b/src/guile/skribilo/engine/html.scm
@@ -58,6 +58,14 @@
(if (not (engine? base-engine))
(error "bootstrap problem: base engine broken" base-engine))
+(define unspecified?
+ ;; XXX: Hack to recognize the unspecified value as understood by
+ ;; `engine-custom' et al.
+ (let ((really-unspecified? unspecified?))
+ (lambda (x)
+ (or (really-unspecified? x)
+ (eq? x 'unspecified)))))
+
;*---------------------------------------------------------------------*/
;* html-file-default ... */
;*---------------------------------------------------------------------*/