=> Bootstrap dependency digest>=20010302: found digest-20180917
===> Building for swi-prolog-jpl-7.6.4
gmake: Makefile: No such file or directory
gmake: *** No rule to make target 'Makefile'.  Stop.
*** Error code 2

Stop.
make[1]: stopped in /usr/pkgsrc/lang/swi-prolog-jpl
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/lang/swi-prolog-jpl