There's a merged pull request on the void-packages repository

armadillo: remove absolute paths form headers
https://github.com/void-linux/void-packages/pull/23820

Description:
It was #define ARMA_SUPERLU_INCLUDE_DIR /usr/arm-linux-gnueabihf/usr/include/
before. Absolute paths can't match usage of same package in both
cross and native environment at same time, let alone expansion of
'linux' macro. As all headers are installed into standard location,
relative path works.
Not suitable to upstream.