David Carlisle submitted an update to the
blkarray
package.
Version number: 0.07 License type: lppl
Summary description: Extended array and tabular.
Announcement text: ----------------------------------------------------------------------
Minor update to blkarray to avoid a clash with amsmath. See
http://tex.stackexchange.com/a/230328 ----------------------------------------------------------------------
This package is located at http://mirror.ctan.org/macros/latex/contrib/blkarray
More information is at http://www.ctan.org/pkg/blkarray
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Thanks for the upload.
For the CTAN Team Manfred Lotz