rj@funtoo-next ~ $ sudo emerge -1av modemmanager

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild  N     ] net-misc/modemmanager-1.21.1:0/1::net-kit  USE="elogind introspection policykit qmi qrtr udev -mbim -vala" 0 KiB

Total: 1 package (1 new), Size of downloads: 0 KiB

Would you like to merge these packages? [Yes/No] 

>>> Verifying ebuild manifests

>>> Emerging (1 of 1) net-misc/modemmanager-1.21.1::net-kit
 * ModemManager-1.21.1.tar.bz2 BLAKE2B SHA512 size ;-) ...               [ ok ]
>>> Unpacking source...
>>> Unpacking ModemManager-1.21.1.tar.bz2 to /var/tmp/portage/net-misc/modemmanager-1.21.1/work
>>> Source unpacked in /var/tmp/portage/net-misc/modemmanager-1.21.1/work
>>> Preparing source in /var/tmp/portage/net-misc/modemmanager-1.21.1/work/ModemManager-1.21.1 ...
 * Insufficient privileges to execute enewgroup
 * Disabling deprecation warnings ...                                    [ ok ]
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/net-misc/modemmanager-1.21.1/work/ModemManager-1.21.1 ...
grep: ./configure: No such file or directory
grep: ./configure.*: No such file or directory
grep: ./configure: No such file or directory
grep: ./configure: No such file or directory
grep: ./configure: No such file or directory
grep: ./configure: No such file or directory
grep: ./configure: No such file or directory
 * ERROR: net-misc/modemmanager-1.21.1::net-kit failed (configure phase):
 *   no configure script found
 * 
 * Call stack:
 *          ebuild.sh, line   93:  Called src_configure
 *        environment, line 2755:  Called gnome3_src_configure '--disable-Werror' '--disable-static' '--with-dist-version=1.21.1' '--with-udev-base-dir=/lib/udev' '--with-udev' '--enable-introspection' '--without-mbim' '--with-polkit' '--with-systemd-suspend-resume' '--without-systemd-journal' '--with-qmi' '--with-qrtr' '--disable-vala'
 *        environment, line 2185:  Called econf '--disable-Werror' '--disable-static' '--with-dist-version=1.21.1' '--with-udev-base-dir=/lib/udev' '--with-udev' '--enable-introspection' '--without-mbim' '--with-polkit' '--with-systemd-suspend-resume' '--without-systemd-journal' '--with-qmi' '--with-qrtr' '--disable-vala'
 *   phase-helpers.sh, line  686:  Called die
 * The specific snippet of code:
 *           die "no configure script found"
 * 
 * If you need support, post the output of `emerge --info '=net-misc/modemmanager-1.21.1::net-kit'`,
 * the complete build log and the output of `emerge -pqv '=net-misc/modemmanager-1.21.1::net-kit'`.
 * The complete build log is located at '/var/log/portage/net-misc:modemmanager-1.21.1:20221119-050448.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/net-misc/modemmanager-1.21.1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/net-misc/modemmanager-1.21.1/temp/environment'.
 * Working directory: '/var/tmp/portage/net-misc/modemmanager-1.21.1/work/ModemManager-1.21.1'
 * S: '/var/tmp/portage/net-misc/modemmanager-1.21.1/work/ModemManager-1.21.1'

>>> Failed to emerge net-misc/modemmanager-1.21.1, Log file:

>>>  '/var/log/portage/net-misc:modemmanager-1.21.1:20221119-050448.log'

 * Messages for package net-misc/modemmanager-1.21.1:
 * Log file: /var/log/portage/net-misc:modemmanager-1.21.1:20221119-050448.log

 * ERROR: net-misc/modemmanager-1.21.1::net-kit failed (configure phase):
 *   no configure script found
 * 
 * Call stack:
 *          ebuild.sh, line   93:  Called src_configure
 *        environment, line 2755:  Called gnome3_src_configure '--disable-Werror' '--disable-static' '--with-dist-version=1.21.1' '--with-udev-base-dir=/lib/udev' '--with-udev' '--enable-introspection' '--without-mbim' '--with-polkit' '--with-systemd-suspend-resume' '--without-systemd-journal' '--with-qmi' '--with-qrtr' '--disable-vala'
 *        environment, line 2185:  Called econf '--disable-Werror' '--disable-static' '--with-dist-version=1.21.1' '--with-udev-base-dir=/lib/udev' '--with-udev' '--enable-introspection' '--without-mbim' '--with-polkit' '--with-systemd-suspend-resume' '--without-systemd-journal' '--with-qmi' '--with-qrtr' '--disable-vala'
 *   phase-helpers.sh, line  686:  Called die
 * The specific snippet of code:
 *           die "no configure script found"
 * 
 * If you need support, post the output of `emerge --info '=net-misc/modemmanager-1.21.1::net-kit'`,
 * the complete build log and the output of `emerge -pqv '=net-misc/modemmanager-1.21.1::net-kit'`.
 * The complete build log is located at '/var/log/portage/net-misc:modemmanager-1.21.1:20221119-050448.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/net-misc/modemmanager-1.21.1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/net-misc/modemmanager-1.21.1/temp/environment'.
 * Working directory: '/var/tmp/portage/net-misc/modemmanager-1.21.1/work/ModemManager-1.21.1'
 * S: '/var/tmp/portage/net-misc/modemmanager-1.21.1/work/ModemManager-1.21.1'