Sorry for the spam today, but after fixing my pillow issue I encountered a problem with fpylll on 9.3.beta4. The key lines seem to be:
build/src/fpylll/fplll/integer_matrix.cpp:706:10: fatal error: 'fplll/sieve/sieve_gauss.h' file not found
#include "fplll/sieve/sieve_gauss.h"
^~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
I've attached the config file, but I wonder if something is wrong with the upstream tarball.