[R-sig-Debian] libRblas.so: cannot open shared object file: No such file or directory

[Steve Gutreuter]

Thanks Dirk.  That is what I thought, and sessionInfo() returns:

Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/atlas/libblas.so.3.10.3
LAPACK: /usr/lib/x86_64-linux-gnu/atlas/liblapack.so.3.10.3

locale:
  [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
  [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
  [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
  [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
  [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

so R is indeed aware of a blas.  However, packages that require a blas 
fail to build and return

libRblas.so: cannot open shared object file: No such file or directory

Baffled,

Steve



On 09/22/2018 04:55 PM, Dirk Eddelbuettel wrote:
> On 22 September 2018 at 16:08, Steve Gutreuter wrote:
> | R 3.5.1 is installed under Linux Mint 19 from binaries r-base and
> | r-base-dev from ubuntu bionic-cran35.  Mysteriously, packages using
> | libRblas cannot be compiled.  I get: libRblas.so: cannot open shared
> | object file: No such file or directory.  And indeed, I find no libRblas.so.
> |
> | Any ideas about how to fix this?
>
> What does   sessionInfo()   show?  For me on this computer it is
>
>    R> sessionInfo()
>    R version 3.5.1 (2018-07-02)
>    Platform: x86_64-pc-linux-gnu (64-bit)
>    Running under: Ubuntu 18.04.1 LTS
>
>    Matrix products: default
>    BLAS: /usr/lib/x86_64-linux-gnu/openblas/libblas.so.3
>    LAPACK: /usr/lib/x86_64-linux-gnu/libopenblasp-r0.2.20.so
>    [...]
>
>
> If Mint follows the setup I use for the Debian package, then you _never have
> libRblas.so_ because we use the _external_ BLAS.  This allows you to switch
> to Atlas (tuned BLAS), OpenBLAS (multithreaded), Intel MKL (multithreaded and
> possibly a little faster than OpenBLAS but much bigger), ...
>
> Dirk
>