libarmadillo-dev 1:9.800.4+dfsg-1build1 (ppc64el binary) in ubuntu focal

 Armadillo is a streamlined C++ linear algebra library (matrix maths)
 aiming towards a good balance between speed and ease of use. Integer,
 floating point and complex numbers are supported, as well as a subset
 of trigonometric and statistics functions. Optional integration with
 LAPACK and ATLAS libraries is also provided.
 .
 This package has the development libraries and headers for Armadillo.