Gentoo ~ # cat /var/tmp/portage/dev-util/gtk-update-icon-cache-3.24.16/temp/build.log
 * Package:    dev-util/gtk-update-icon-cache-3.24.16
 * Repository: gentoo
 * Maintainer: gnome@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking gtk-update-icon-cache-3.24.16.tar.bz2 to /var/tmp/portage/dev-util/gtk-update-icon-cache-3.24.16/work
>>> Source unpacked in /var/tmp/portage/dev-util/gtk-update-icon-cache-3.24.16/work
>>> Preparing source in /var/tmp/portage/dev-util/gtk-update-icon-cache-3.24.16/work/gtk-update-icon-cache-3.24.16 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-util/gtk-update-icon-cache-3.24.16/work/gtk-update-icon-cache-3.24.16 ...
Traceback (most recent call last):
  File "/usr/lib/python-exec/python3.6/meson", line 6, in <module>
    from pkg_resources import load_entry_point
ModuleNotFoundError: No module named 'pkg_resources'
 * ERROR: dev-util/gtk-update-icon-cache-3.24.16::gentoo failed (configure phase):
 *   _ver_compare: invalid version:
 *
 * Call stack:
 *     ebuild.sh, line  125:  Called src_configure
 *   environment, line 2201:  Called meson_src_configure
 *   environment, line 1503:  Called ver_test '' '-lt' '0.54'
 *   environment, line 2938:  Called _ver_compare '' '0.54'
 *   environment, line  772:  Called die
 * The specific snippet of code:
 *       [[ ${va} =~ ${re} ]] || die "${FUNCNAME}: invalid version: ${va}";
 *
 * If you need support, post the output of `emerge --info '=dev-util/gtk-update-icon-cache-3.24.16::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-util/gtk-update-icon-cache-3.24.16::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/dev-util/gtk-update-icon-cache-3.24.16/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-util/gtk-update-icon-cache-3.24.16/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-util/gtk-update-icon-cache-3.24.16/work/gtk-update-icon-cache-3.24.16'
 * S: '/var/tmp/portage/dev-util/gtk-update-icon-cache-3.24.16/work/gtk-update-icon-cache-3.24.16'