net-libs/libfwbuilder seems to work with a rename only to 2.1.17.
for net-firewall/fwbuilder i've made a few changes
antlr parts removed from ebuild because fwbuilder uses its own antlr with a few patches/fixes see https://sourceforge.net/tracker/?func=detail&atid=105314&aid=1903832&group_id=5314
diff is attached.
Created attachment 145341 [details, diff]
compiles against 2.1.18 as well on x64
I'm going to mark this as a duplicate of another bug solely because I don't think it is necessary to put 2.1.17 & 2.1.18 in the tree. Hope you understand ;) Thanks for reporting!
*** This bug has been marked as a duplicate of bug 219471 ***