$lydir/generate-documentation')
doc_stems = map (lambda x: os.path.splitext (x)[0], sources)
-texis = map (env.TELY, doc_stems)
+texis = map (env.TEXI, doc_stems)
dvis = map (env.Texi2dvi, doc_stems)
pss = map (env.PostScript, map (lambda x: x + '.dvi', doc_stems))
pdfs = map (env.Dvi2pdf, doc_stems)