postinst is in libopenblas-dev 0.2.20+ds-4.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | #!/bin/sh
set -e
update-alternatives --install /usr/lib/x86_64-linux-gnu/libblas.so libblas.so-x86_64-linux-gnu \
/usr/lib/x86_64-linux-gnu/openblas/libblas.so 40 \
--slave /usr/lib/x86_64-linux-gnu/libblas.a libblas.a-x86_64-linux-gnu \
/usr/lib/x86_64-linux-gnu/openblas/libblas.a \
--slave /usr/include/x86_64-linux-gnu/cblas.h cblas.h-x86_64-linux-gnu \
/usr/include/x86_64-linux-gnu/cblas-openblas.h \
--slave /usr/lib/x86_64-linux-gnu/pkgconfig/blas.pc \
blas.pc-x86_64-linux-gnu /usr/lib/x86_64-linux-gnu/pkgconfig/blas-openblas.pc
update-alternatives --install /usr/lib/x86_64-linux-gnu/liblapack.so \
liblapack.so-x86_64-linux-gnu \
/usr/lib/x86_64-linux-gnu/openblas/liblapack.so 40 \
--slave /usr/lib/x86_64-linux-gnu/liblapack.a liblapack.a-x86_64-linux-gnu \
/usr/lib/x86_64-linux-gnu/openblas/liblapack.a \
--slave /usr/lib/x86_64-linux-gnu/pkgconfig/lapack.pc \
lapack.pc-x86_64-linux-gnu \
/usr/lib/x86_64-linux-gnu/pkgconfig/lapack-openblas.pc
exit 0
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