* Package:    dev-erlang/proper-1.3
 * Repository: gentoo
 * Maintainer: ejabberd@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox

>>> Unpacking source...
>>> Unpacking proper-1.3.tar.gz to /var/tmp/portage/dev-erlang/proper-1.3/work
>>> Source unpacked in /var/tmp/portage/dev-erlang/proper-1.3/work
>>> Preparing source in /var/tmp/portage/dev-erlang/proper-1.3/work/proper-1.3 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-erlang/proper-1.3/work/proper-1.3 ...
Using Erlang's 'random' ('rand' in 19.0 and later) module
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-erlang/proper-1.3/work/proper-1.3 ...
==> proper-1.3 (compile)
Compiled src/vararg.erl
Compiled src/proper_target.erl
Compiled src/proper_types.erl
Compiled src/proper_array.erl
Compiled src/proper_dict.erl
Compiled src/proper_arith.erl
Compiled src/proper_fsm.erl
Compiled src/proper_gb_trees.erl
Compiled src/proper_gb_sets.erl
=ERROR REPORT==== 4-Feb-2022::06:04:22.210158 ===
beam/beam_load.c(1879): Error loading module vararg:
  This BEAM file was compiled for a later version of the run-time system than 23.
  To fix this, please recompile this module with an 23 compiler.
  (Use of opcode 172; this emulator supports only up to 170.)


src/proper_gen.erl:none: undefined parse transform 'vararg'
Compiling src/proper_gen.erl failed:
ERROR: compile failed while processing /var/tmp/portage/dev-erlang/proper-1.3/work/proper-1.3: rebar_abort
 * ERROR: dev-erlang/proper-1.3::gentoo failed (compile phase):
 *   rebar compile failed
 * 
 * Call stack:
 *     ebuild.sh, line 127:  Called src_compile
 *   environment, line 551:  Called rebar_src_compile
 *   environment, line 509:  Called erebar 'compile'
 *   environment, line 431:  Called die
 * The specific snippet of code:
 *       rebar -v skip_deps=true "$@" || die -n "rebar $@ failed"
 * 
 * If you need support, post the output of `emerge --info '=dev-erlang/proper-1.3::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-erlang/proper-1.3::gentoo'`.
 * The complete build log is located at '/var/log/portage/dev-erlang:proper-1.3:20220204-050419.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/dev-erlang/proper-1.3/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-erlang/proper-1.3/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-erlang/proper-1.3/work/proper-1.3'
 * S: '/var/tmp/portage/dev-erlang/proper-1.3/work/proper-1.3'