Bug#972827: libgiac-dev: should include config.h

[Benjamin Barenblat]

Package: libgiac-dev
Version: 1.4.9.69+dfsg1-2
Severity: grave

Many Giac headers #include "config.h", and they use its contents in such
a way that config.h is essential to define the library ABI. (For
example, some members are gated behind #ifdef HAVE_LIBPTHREAD.)
Developing against Giac without the exact config.h generated during the
library build thus triggers an ABI mismatch, usually manifesting as a
segfault.

Requiring Giac’s config.h is unfortunate, and upstream recognizes it –
giac/gen.h includes the note

  // FIXME: macros defined in config.h are not welcome in a public header!

Until that FIXME is resolved, though, Debian needs to ship Giac’s
config.h with the other Giac headers.
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