Twin directories of yacc:

[DIR]  ftp://ftp.prz.rzeszow.pl/pub/gentoo/portage/dev-util/yacc/
[DIR]  ftp://ftp.nz.debian.org/gentoo-x86-portage/dev-util/yacc/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/usr.bin/yacc/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-release-4-0/src/usr.bin/yacc/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-release-4-0/src/tools/yacc/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/src/tools/yacc/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/NetBSD-current/src/usr.bin/yacc/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/gentoo-portage/dev-util/yacc/
[DIR]  ftp://ftp.swin.edu.au/gentoo-portage/dev-util/yacc/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/usr.bin/yacc/
[DIR]  ftp://ftp.mgts.by/pub/gentoo/gentoo-portage/dev-util/yacc/
[DIR]  ftp://ftp.andr.ru/pub/os/inferno/4/tags/20080603/utils/yacc/
[DIR]  ftp://ftp.andr.ru/pub/os/inferno/4/tags/20070510/utils/yacc/
[DIR]  ftp://ftp.andr.ru/pub/os/inferno/4/tags/20061220/utils/yacc/
[DIR]  ftp://ftp.andr.ru/pub/os/inferno/4/branches/auth/utils/yacc/
[DIR]  ftp://ftp.andr.ru/pub/os/inferno/4/tags/20070202/utils/yacc/
[DIR]  ftp://ftp.andr.ru/pub/os/inferno/4/tags/20070115/utils/yacc/
[DIR]  ftp://ftp.cs.mun.ca/pub/mirror/gentoo-portage/dev-util/yacc/
[DIR]  ftp://sapi.vlsm.org/gentoo-portage/dev-util/yacc/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-4-0/src/tools/yacc/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-4-0/src/usr.bin/yacc/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/tools/yacc/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-1/src/usr.bin/yacc/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-0/src/tools/yacc/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-release-3-0/src/usr.bin/yacc/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-current/src/tools/yacc/
[DIR]  ftp://ftp.sk.freebsd.org/pub/NetBSD/NetBSD-current/src/usr.bin/yacc/
[DIR]  ftp://ftp.sk.freebsd.org/pub/FreeBSD/development/FreeBSD-CVS/src/usr.bin/yacc/
[DIR]  ftp://ftp.ps.pl/dsk0/ftp.openbsd.org/src/usr.bin/yacc/
pkg://9base-20051114.tgz:1119874/9base-20051114/  downloads[DIR]3  9base-20051114.tgz/9base-20051114/yacc/
pkg://9base-b20060209.tbz:293193/9base-b20060209/  downloads[DIR]3  9base-b20060209.tbz/9base-b20060209/yacc/
pkg://9base_2+20071126-1_amd64.deb:500246/9base-2+20070601/  info  downloads[DIR]3  9base_2+20071126-1_amd64.deb/9base-2+20070601/yacc/
pkg://9base_2-2_amd64.deb:459558/9base-2+20071126/  info  downloads[DIR]3  9base_2-2_amd64.deb/9base-2+20071126/yacc/
pkg://9box-0.2.1.tar.gz:15170/9base-2/  downloads[DIR]3  9box-0.2.1.tar.gz/9base-2/yacc/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-release-4-0/src/tools/yacc/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-release-4-0/src/usr.bin/yacc/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-release-3-1/src/tools/yacc/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-release-3-1/src/usr.bin/yacc/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-release-3-0/src/tools/yacc/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-release-3-0/src/usr.bin/yacc/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-current/src/tools/yacc/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.netbsd.org/NetBSD-current/src/usr.bin/yacc/
[DIR]  ftp://ftp.free.fr/.mirrors1/ftp.freebsd.org/development/FreeBSD-CVS/src/usr.bin/yacc/
[DIR]  ftp://ftp.dc.aleron.net/pub/FreeBSD/development/FreeBSD-CVS/src/usr.bin/yacc/
pkg://GoferTransport-http-1.00.tar.gz:8955/usr/lib/gobo/library/parse/  downloads[DIR]3  GoferTransport-http-1.00.tar.gz/usr/lib/gobo/library/parse/yacc/
[DIR]  ftp://ftp.cse.buffalo.edu/mirror/BSD/FreeBSD/development/FreeBSD-CVS/src/usr.bin/yacc/
[DIR]  ftp://ftp13.freebsd.org/pub/FreeBSD/development/FreeBSD-CVS/src/usr.bin/yacc/
pkg://MetaOCaml_308_alpha_027.tar.gz:2673440/MetaOCaml_308_alpha_020/  downloads[DIR]3  MetaOCaml_308_alpha_027.tar.gz/MetaOCaml_308_alpha_020/yacc/
pkg://MetaRuby-0.7.tar.gz:52827/MetaOCaml_308_alpha_027/  downloads[DIR]3  MetaRuby-0.7.tar.gz/MetaOCaml_308_alpha_027/yacc/
[DIR]  ftp://ftp13.freebsd.org/cvsup/ncvs/src/usr.bin/yacc/