[R-sig-Debian] custom built R will not change BLAS/LAPACK with update-alternatives

[Ivan Krylov]

On Sat, 30 Dec 2023 18:37:06 +0100
Ramon Diaz-Uriarte <rdiaz02 using gmail.com> wrote:

>  configure: searching for an external BLAS
> configure: searching for BLAS in default libraries
> checking for dgemm_... no
> configure: searching for OpenBLAS

The code implementing this logic is in m4/R.m4, starting around line
2600. If --with-blas is given without an argument, the configure script
goes searching for various BLASes. It happens to try -lopenblas before
-lblas, so that's what ends up being linked.

Does it help to use --with-blas=blas or --with-blas=-lblas so that the
configure script doesn't try to detect it automatically?

-- 
Best regards,
Ivan