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