I finally managed to get execline to compile - turns out there was an error in
the options I had passed to configure:
> ./configure --host=armeb-linux-musleabi --prefix=/usr/local --disable-shared \
> --with-sysdeps=/path/to/sysdeps.cfg/ \
> --with-include=/path/to/staging/usr/local/include \
The '--with-lib' line should instead point to
'/path/to/staging/usr/local/lib/skalibs' - I hadn't noticed that skalibs puts
static libraries in a subdirectory of the library directory.