configure: WARNING: 'missing' script is too old or missing

[Alessandro-Barbieri]

./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --disable-dependency-tracking --disable-silent-rules --docdir=/usr/share/doc/genders-9999 --htmldir=/usr/share/doc/genders-9999/html --with-sysroot=/ --libdir=/usr/lib64 --disable-static --with-non-shortened-hostnames --with-cplusplus-extensions --with-java-extensions --with-perl-extensions --with-python-extensions
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking target system type... x86_64-pc-linux-gnu
checking for a BSD-compatible install... /usr/lib/portage/pypy/ebuild-helpers/xattr/install -c
checking whether build environment is sane... yes
/var/tmp/portage/sys-cluster/genders-9999/work/genders-9999/config/missing: Unknown `--is-lightweight' option
Try `/var/tmp/portage/sys-cluster/genders-9999/work/genders-9999/config/missing --help' for more information
configure: WARNING: 'missing' script is too old or missing
checking for a thread-safe mkdir -p... /bin/mkdir -p