diff -up asymptote-2.21/doc/Makefile.in.VERBOSE asymptote-2.21/doc/Makefile.in
--- asymptote-2.21/doc/Makefile.in.VERBOSE 2012-11-08 15:34:54.587317430 -0500
+++ asymptote-2.21/doc/Makefile.in 2012-11-08 15:34:46.948315825 -0500
@@ -9,7 +9,7 @@ docdir = $(DESTDIR)@docdir@
infodir = $(DESTDIR)@infodir@
datarootdir = @datarootdir@
INSTALL = @INSTALL@
-TEXI2DVI = @TEXI2DVI@
+TEXI2DVI = @TEXI2DVI@ --verbose
export docdir infodir INSTALL