Okvis uses cross-compiler for host compile

[Desperado17]

Greetings, I'm currently trying to cross-compile okvis 1.1.3 from this zip for aarch64:

https://www.doc.ic.ac.uk/~sleutene/software/okvis-1.1.3.zip

Unfortunately, some compile seems to fail because it seems to use the cross-compiler for a step that should have been done by the host compiler ( in this case /usr/bin/g++ instead of the cross toolchains aarch64-linux-gnu-g++ ) :

[ 2%] Performing configure step for 'ceres_external'
[ 2%] Performing configure step for 'brisk_external'
[ 4%] Performing configure step for 'opengv_external'
[ 5%] Building CXX object okvis_util/CMakeFiles/okvis_util.dir/src/dependency-tracker.cc.o
CMake Deprecation Warning at CMakeLists.txt:1 (cmake_minimum_required):
Compatibility with CMake < 3.5 will be removed from a future version of
CMake.

Update the VERSION argument value or use a ... suffix to tell
CMake that the project does not need compatibility with older versions.

CMake Deprecation Warning at CMakeLists.txt:1 (cmake_minimum_required):
Compatibility with CMake < 3.5 will be removed from a future version of
CMake.

Update the VERSION argument value or use a ... suffix to tell
CMake that the project does not need compatibility with older versions.

CMake Deprecation Warning at CMakeLists.txt:32 (CMAKE_MINIMUM_REQUIRED):
Compatibility with CMake < 3.5 will be removed from a future version of
CMake.

Update the VERSION argument value or use a ... suffix to tell
CMake that the project does not need compatibility with older versions.

CMake Deprecation Warning at CMakeLists.txt:33 (CMAKE_POLICY):
Compatibility with CMake < 3.5 will be removed from a future version of
CMake.

Update the VERSION argument value or use a ... suffix to tell
CMake that the project does not need compatibility with older versions.

aarch64-linux-gnu-g++: error: unrecognized command line option '-mssse3'
make[2]: *** [okvis_util/CMakeFiles/okvis_util.dir/build.make:76: okvis_util/CMakeFiles/okvis_util.dir/src/dependency-tracker.cc.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:384: okvis_util/CMakeFiles/okvis_util.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

Any idea on how to fix this?

Regards