Comment 10 for bug 1892420

> Our own FindLAPACK and also CMake FindLAPACK include both the BLAS library in the LAPACK_LIBRARIES (both tested!)

Interesting. I also see that in /usr/share/cmake/Modules/FindLAPACK.cmake:231-502:
if(BLAS_FOUND)
  [...]
else()
  message(STATUS "LAPACK requires BLAS")
endif()

For me the output is:
-- Checking for module 'lapack'
-- Found lapack, version 3.8.0
-- Found LAPACK: /usr/lib64/liblapack.so
-- LAPACK found (/usr/lib64/liblapack.so)

And not:
-- LAPACK found (/usr/lib/i386-linux-gnu/liblapack.so;/usr/lib/i386-linux-gnu/libblas.so)

I will investigate why there is this difference.

> If I request CMake to use a library I assume it returns all needed libraries to use the requested library - so I have not to check which other libs the requested library is using internal.

That is correct. But Hugin (via levmar) also uses BLAS, which at that point is no longer an implementation detail of LAPACK, but a direct dependency of Hugin.