ginac.html: ginac.texi version.texi $(PNG)
$(MAKEINFO) --html $< -I ${srcdir}
-ginacdocdir = $(datadir)/doc/GiNaC
-ginactutorialdir = $(ginacdocdir)/tutorial
+ginactutorialdir = `test -z "@TUTORIAL_TARGETS@" || echo @datadir@/doc/GiNaC/tutorial`
ginactutorial_DATA = @TUTORIAL_TARGETS@
CLEANFILES = $(EPS) $(PNG) ginac.html