Install this version:
emerge -a =app-emacs/jabber-0.10.5
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =app-emacs/jabber-0.10.5
Or alternatively:
emerge --autounmask-write -a =app-emacs/jabber-0.10.5
# automatically generated by g-sorcery
# please do not edit this file
EAPI=8
REPO_URI="https://elpa.nongnu.org/nongnu/"
SOURCE_TYPE="tar"
REALNAME="jabber"
DIGEST_SOURCES="yes"
inherit g-sorcery gs-elpa
DESCRIPTION="XMPP/Jabber client"
HOMEPAGE="https://git.thanosapollo.org/emacs-jabber"
SRC_URI="${REPO_URI}${REALNAME}-${PV}.${SUFFIX}"
SLOT="0"
KEYWORDS="~amd64 ~x86"
DEPEND="app-emacs/fsm"
RDEPEND="app-emacs/fsm"
app-emacs/fsm
app-emacs/fsm