rebuild x86_64-linux on Ubuntu 14.04.6 LTS;
rebuild x86_64-cygwin on cygwin-20200116;
#main components for everyday use, without big impact on overall build time
bash_process-1.2.3
bib2xhtml-20190409
csdp-6.1-1
cvc4-1.5-5
e-2.0-3
isabelle_fonts-20190717
jdk-11.0.6+10
jedit_build-20190717
jfreechart-1.5.0
jortho-1.0-2
kodkodi-1.5.2-1
nunchaku-0.5
opam-2.0.6
polyml-5.8.1-20200228
postgresql-42.2.9
scala-2.12.10
smbc-0.4.1
spass-3.8ds-1
sqlite-jdbc-3.30.1
ssh-java-20190323
stack-2.1.3
vampire-4.2.2
xz-java-1.8
z3-4.4.0pre-3