I agree that losing a standard package for failing to build it on one particular target would be bad.
>From Trac#20523 <https://trac.sagemath.org/ticket/20523> : Replying to [comment:11 embray]: On Cygwin I needed to `apt-cyg install liblzma-devel` (if you have `apt-cyg`, otherwise use setup as normal). Without the `-devel` package it doesn't install the import library, so `-llzma` doesn't work (`-llzma.dll` should though). Okay. I just checked on my (Linux) system : xz is not installed in the $(SAGE_ROOT) tree, probably because I have it installed at system level and the build script detects that somehow. (BTW : it is an *optional* package. Therefore, what is needed is : a. ensure that xz *and its development files* are installed, either in the system or in the Sage package) ; b. that this is done *before* the R installation begins ; and c. that R installation *depends* on xz being somehow available. This can be simplified, at the expense of making xz a *standard* package, just by ensuring that xz is installed *before* R compilation. I have little idea on how to proceed, since the Sage build system is still a (large) bit obscure to me. What I need is a way to check in the Makefile that xz and its development files are available, install xz if not (can an optional package be installed before the compilation of standard packages is finished ?), and make the R compilation dependent on this target. Any ideas or advice ? Le mardi 23 août 2016 03:27:54 UTC+2, kcrisman a écrit : > > > >> >> Make R optional? (Nothing in Sage depends on it, except for the >> interface to it, including Rpy2.) >> >> > Gosh, R has been standard for*ever*, practically, and is often heavily > advertised as a good reason to use Sage. There are certainly many who have > been using them together (as mentioned, obviously nowhere near the number > of "pure" R users, but still we definitely get queries about this > regularly) and of course optional=untested=broken all too often. Take the > Maple or Mathematica interfaces and their on-again, off-again nature... Is > this only a Cygwin problem, or on other platforms? I couldn't see anything > about other problems on this thread. > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
