bin/armel/swipl -O -o boot32.prc -b boot/init.pl
... Message: error(syntax_error(operator_expected), file(/usr/lib/swipl-5.6.50/boot/init.pl, 1870, 8, 51443)) [PROLOG SYSTEM ERROR: Thread 1 Undefined predicate: $load_additional_boot_files/0 PROLOG STACK: ]