https://github.com/grzegorzmazur/yacas/issues/163
yacas-1.4.0.tar.gz looks like an incomplete upload
Makefile.am: error: required file './README' not found
https://github.com/grzegorzmazur/yacas/issues/164
https://github.com/grzegorzmazur/yacas/issues/165
broken src/Makefile (spaces vs tabs)
migration to github
assorted cleanups