[Octave-bug-tracker] [bug #39823] build failure on systems with older freetype library

[Mike Miller]

Follow-up Comment #5, bug #39823 (project octave):

No, it doesn't take "considerable" work to get current Octave working under
RHEL5 at all. The only required libraries that are too old and need to be
updated are BLAS and LAPACK. Some optional libraries are too old, and those
are properly detected and disabled. Freetype is an optional library as well,
the question here is whether we should spent the effort to make Octave work
with an older one or not.

The only thing I don't know is how much work it would be to try to keep some
degraded functionality in what's been added without the FT_Reference_Face
function. I would use a simple preprocessor #if #else #endif as my reference,
if it's any more complicated than simply not calling something or calling a
function by a different name, then it's too much work.

If it's a lot of work to add in a complex workaround and not worth the
additional maintenance burden, then we make that function required and disable
Freetype if it's not available, like I did recently for the GLPK API changes.

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