Bugzilla Bug 122597

./configure --prefix=/usr --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
--infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
--localstatedir=/var/lib --libdir=/usr/lib64 --build=x86_64-pc-linux-gnu
creating cache ./config.cache
checking host system type... Usage: ./config.sub [OPTION] CPU-MFR-OPSYS
       ./config.sub [OPTION] ALIAS

Canonicalize a configuration name.

Operation modes:
  -h, --help         print this help, then exit
  -t, --time-stamp   print date of last modification, then exit
  -v, --version      print version number, then exit

Report bugs and patches to <config-patches@gnu.org>.
checking for gcc... gcc
checking whether the C compiler (gcc -O2 -pipe -march=athlon64 -Wl,-O2)
works... yes
checking whether the C compiler (gcc -O2 -pipe -march=athlon64 -Wl,-O2) is a
cross-compiler... no
checking whether we are using GNU C... yes
checking whether gcc accepts -g... yes
checking for a BSD compatible install... /bin/install -c
checking build system type... config.sub: invalid option
--bux86_64-pc-linux-gnu
Try `config.sub --help' for more information.
checking for ranlib... ranlib
checking for ld used by GCC... /usr/x86_64-pc-linux-gnu/bin/ld
checking if the linker (/usr/x86_64-pc-linux-gnu/bin/ld) is GNU ld... yes
checking for BSD-compatible nm... /usr/bin/nm -B
checking whether ln -s works... yes
updating cache ./config.cache
ltconfig: too many arguments
Try `ltconfig --help' for more information.
configure: error: libtool configure failed

Basically, applying the sys-devel/flex/files/flex-configure-LANG.patch before
econf in the "use idn && ()" section in src_compile seems to solve this
problem.

bind-tools-9.2.6-r1, using idn, is also affected by this issue.

fixed in 9.2.6-r2 and 9.3.2-r2.
thanks, J.