Trying to build 9.5beta2 using (system) gsl version 2.7 fails
while compiling src/sage/ext/interpreters/wrapper_cdf.pyx, as
the .dat member of the gsl_complex structure no longer exists
unless in legacy mode:
https://git.savannah.gnu.org/cgit/gsl.git/tree/complex/gsl_complex.h?id=89168fb10c0f2f68b831a4cd01a0b6aef083ef97#n73
Hence, trying to access the .real or .complex property of the
Cython gsl_complex type (as is done in wrapper_cdf.pyx) causes
compiler errors, since they're aliases for dat[0] and dat[1]:
https://github.com/sagemath/sagetrac-mirror/blob/develop/src/sage/libs/gsl/types.pxd#L47
I'm not sure how to best fix this in a way that makes Cython
work with both the new and the legacy definition. Anyone? :-)
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