[Bug 203638] math/py-numpy: Undefined symbol "cblas_sgemm"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203638

--- Comment #5 from John Hein <z7dr6ut7gs at snkmail.com> ---
Seems to me that the HAVE_CBLAS detection is not working for numpy.  I know
very little about configuring numpy, but perhaps there's an appropriate fix to
get the numpy setup machinery to more reliably be able to determine if
HAVE_CBLAS should be on or not.  Seems like an upstream problem to me right
now.

Workarounds for the port are perhaps:

 - force HAVE_CBLAS off when building with NETLIB option (much like numpy
forces it off when it detects openblas)

 - depend on a library that has the cblas* functions (math/cblas?) and
encourage HAVE_CBLAS to be on

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