Add test for the TeX to HTML converter

configure.ac

@@ -76,6 +76,7 @@ AC_PATH_PROG(GS, gs$EXEEXT, no)
 AC_PATH_PROG(LATEX, latex$EXEEXT, no)
 AC_PATH_PROG(DVIPS, dvips$EXEEXT, no)
 AC_PATH_PROG(MAKEINDEX, makeindex$EXEEXT, no)
+AC_PATH_PROG(DLH, dlh$EXEEXT, no)
 
 dnl Call explicitely before using PKG_*
 PKG_PROG_PKG_CONFIG

doc/Makefile.am

@@ -258,7 +258,7 @@ sane.pdf: $(srcdir)/sane.tex sane.ind
 endif
 
 sane-html: sane.dvi
-	$(am_TEXINPUTS) dlh $(srcdir)/sane.tex
+	$(am_TEXINPUTS) $(DLH) $(srcdir)/sane.tex
 
 html-man: $(MANPAGES)
 	@for page in $(MANPAGES); do \