diff --git a/dev-lang/tcl/Manifest b/dev-lang/tcl/Manifest
index a424064816da3..d0809e4c587ce 100644
--- a/dev-lang/tcl/Manifest
+++ b/dev-lang/tcl/Manifest
@@ -1,4 +1,5 @@
 DIST tcl-core8.6.5-src.tar.gz 5846556 BLAKE2B 9c3c48acffc13be526b507fc19711b21e710a84642d37d494bb46a2d4ac9445a95749fd9556ffbda57d55f90bd566d0c9cd72a800a34f062616aacf57e811aa4 SHA512 b726f7d3193ad92ba64911b8c724d5454c5a93d5f5e95462ec0a6d8ccbbdf20093888f66c83956d7631392ca805c1a80430f102c0a932de3ed55311101e0e09f
 DIST tcl-core8.6.6-src.tar.gz 5868427 BLAKE2B 3444d474bfdc4958919dbf75527420614251e3cffb0d18fbbf547ffb83ead544f266b6ea868738ae40e02075cf31be6e753e0f89da02a2a81ededf09fc9dd2e6 SHA512 469a0221ed16569b70986cdde261d0c0df3bf64c493b8d6fc8368eb14597f7c2f6a01f082a1c8f27eb720618956e053cc97fbb9aaf7bb29cc96781cdc8e9518c
 DIST tcl-core8.6.7-src.tar.gz 5875027 BLAKE2B bc08e4e6639ba33176c8c1e670b957b8ad62a4790ace4ff8f8dc964f676ca87473c31c28f645d32a8287f844756fa224a077f96f1425f61b9872a4a0ae1429a1 SHA512 95c8c5bcb4fe604a77ca6ba9d49f9e90d156feaa9f3ab97661983f256ab54476b103ec8de01cd47231ed95e6df5e36d60514aed2ba5b8f3619cc5a3698ad3ee5
+DIST tcl-core8.6.8-src.tar.gz 5887483 BLAKE2B 2b8428652e451b817fe63a811f910001929cdcbc8a8361cdf4f7df8e13cbf9b18c94a91c22c0f09cc46dc0174a66c44774b485539a8f24c14faee6658547b6b8 SHA512 36e6079b582c205e8c89435b361ef96550541357f473aea2ca4e6f01bd84e50ebd1474a75a1ae90640b9a5b392fb01ddfa71f0fa28e409b3569d88c32b4ddb69
 DIST tcl8.5.17-src.tar.gz 4546317 BLAKE2B 27031dd3bd5790d03692e77edf91eb7fae8a40d8d193d8c8ce4e79b21f90e683bfc9d5b71764760223987fb163be844e6096d0aea1058b8ce255731d97e2a0ea SHA512 ad5ddb4cd6378fd6bbea8cd85ceb1cf90392b2e8c49fbfb3e4b35c81d3ae3e3f087697c41fcba8c8e06de1d9e7539397e26d58b864dc01ba65abe4ba4efa9568
diff --git a/dev-lang/tcl/files/tcl-8.6.8-conf.patch b/dev-lang/tcl/files/tcl-8.6.8-conf.patch
new file mode 100644
index 0000000000000..26599e1672fb3
--- /dev/null
+++ b/dev-lang/tcl/files/tcl-8.6.8-conf.patch
@@ -0,0 +1,11 @@
+--- a/unix/tcl.m4
++++ b/unix/tcl.m4
+@@ -1402,7 +1402,7 @@
+ 	    # get rid of the warnings.
+ 	    #CFLAGS_OPTIMIZE="${CFLAGS_OPTIMIZE} -D__NO_STRING_INLINES -D__NO_MATH_INLINES"
+ 
+-	    SHLIB_LD='${CC} ${CFLAGS} ${LDFLAGS} -shared'
++	    SHLIB_LD='${CC} ${CFLAGS} ${LDFLAGS} -shared -fPIC -Wl,-soname,${@}'
+ 	    DL_OBJS="tclLoadDl.o"
+ 	    DL_LIBS="-ldl"
+ 	    LDFLAGS="$LDFLAGS -Wl,--export-dynamic"
diff --git a/dev-lang/tcl/files/tcl-8.6.8-libieee.patch b/dev-lang/tcl/files/tcl-8.6.8-libieee.patch
new file mode 100644
index 0000000000000..942144e68c71f
--- /dev/null
+++ b/dev-lang/tcl/files/tcl-8.6.8-libieee.patch
@@ -0,0 +1,15 @@
+--- a/unix/tcl.m4
++++ b/unix/tcl.m4
+@@ -2470,12 +2470,9 @@
+     #--------------------------------------------------------------------
+     # On a few very rare systems, all of the libm.a stuff is
+     # already in libc.a.  Set compiler flags accordingly.
+-    # Also, Linux requires the "ieee" library for math to work
+-    # right (and it must appear before "-lm").
+     #--------------------------------------------------------------------
+ 
+     AC_CHECK_FUNC(sin, MATH_LIBS="", MATH_LIBS="-lm")
+-    AC_CHECK_LIB(ieee, main, [MATH_LIBS="-lieee $MATH_LIBS"])
+ 
+     #--------------------------------------------------------------------
+     # Interactive UNIX requires -linet instead of -lsocket, plus it
diff --git a/dev-lang/tcl/tcl-8.6.8.ebuild b/dev-lang/tcl/tcl-8.6.8.ebuild
new file mode 100644
index 0000000000000..1ce4659ee3808
--- /dev/null
+++ b/dev-lang/tcl/tcl-8.6.8.ebuild
@@ -0,0 +1,130 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+inherit autotools eutils flag-o-matic multilib multilib-minimal toolchain-funcs versionator
+
+MY_P="${PN}${PV}"
+
+DESCRIPTION="Tool Command Language"
+HOMEPAGE="http://www.tcl.tk/"
+SRC_URI="mirror://sourceforge/tcl/${PN}-core${PV}-src.tar.gz"
+
+LICENSE="tcltk"
+SLOT="0/8.6"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86 ~amd64-fbsd ~x86-fbsd ~amd64-linux ~arm-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~m68k-mint ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+IUSE="debug +threads"
+
+RDEPEND=">=sys-libs/zlib-1.2.8-r1[${MULTILIB_USEDEP}]"
+DEPEND="${RDEPEND}"
+
+SPARENT="${WORKDIR}/${MY_P}"
+S="${SPARENT}"/unix
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-8.5.13-multilib.patch
+	"${FILESDIR}"/${PN}-8.6.8-conf.patch # Bug 125971
+	"${FILESDIR}"/${PN}-8.6.8-libieee.patch
+)
+
+src_prepare() {
+	find \
+		"${SPARENT}"/compat/* \
+		"${SPARENT}"/doc/try.n \
+		-delete || die
+
+	pushd "${SPARENT}" &>/dev/null || die
+	default
+	popd &>/dev/null || die
+
+	# workaround stack check issues, bug #280934
+	use hppa && append-cflags "-DTCL_NO_STACK_CHECK=1"
+
+	tc-export CC
+
+	sed \
+		-e '/chmod/s:555:755:g' \
+		-i Makefile.in || die
+
+	sed \
+		-e 's:-O[2s]\?::g' \
+		-i tcl.m4 || die
+
+	mv configure.{in,ac} || die
+
+	eautoconf
+
+	multilib_copy_sources
+}
+
+multilib_src_configure() {
+	# We went ahead and deleted the whole compat/ subdir which means
+	# the configure tests to detect broken versions need to pass (else
+	# we'll fail to build).  This comes up when cross-compiling, but
+	# might as well get a minor configure speed up normally.
+	export ac_cv_func_memcmp_working="yes"
+	export tcl_cv_str{str,toul,tod}_unbroken="ok"
+	export tcl_cv_strtod_buggy="no"
+
+	econf \
+		$(use_enable threads) \
+		$(use_enable debug symbols)
+}
+
+multilib_src_install() {
+	#short version number
+	local v1=$(get_version_component_range 1-2)
+	local mylibdir=$(get_libdir)
+
+	S= default
+	# fix the tclConfig.sh to eliminate refs to the build directory
+	# and drop unnecessary -L inclusion to default system libdir
+
+	sed \
+		-e "/^TCL_BUILD_LIB_SPEC=/s:-L$(pwd) *::g" \
+		-e "/^TCL_LIB_SPEC=/s:-L${EPREFIX}/usr/${mylibdir} *::g" \
+		-e "/^TCL_SRC_DIR=/s:${SPARENT}:${EPREFIX}/usr/${mylibdir}/tcl${v1}/include:g" \
+		-e "/^TCL_BUILD_STUB_LIB_SPEC=/s:-L$(pwd) *::g" \
+		-e "/^TCL_STUB_LIB_SPEC=/s:-L${EPREFIX}/usr/${mylibdir} *::g" \
+		-e "/^TCL_BUILD_STUB_LIB_PATH=/s:$(pwd):${EPREFIX}/usr/${mylibdir}:g" \
+		-e "/^TCL_LIB_FILE=/s:'libtcl${v1}..TCL_DBGX..so':\"libtcl${v1}\$\{TCL_DBGX\}.so\":g" \
+		-i "${ED}"/usr/${mylibdir}/tclConfig.sh || die
+	if use prefix && [[ ${CHOST} != *-darwin* && ${CHOST} != *-mint* ]] ; then
+		sed \
+			-e "/^TCL_CC_SEARCH_FLAGS=/s|'$|:${EPREFIX}/usr/${mylibdir}'|g" \
+			-e "/^TCL_LD_SEARCH_FLAGS=/s|'$|:${EPREFIX}/usr/${mylibdir}'|" \
+			-i "${ED}"/usr/${mylibdir}/tclConfig.sh || die
+	fi
+
+	# install private headers
+	insinto /usr/${mylibdir}/tcl${v1}/include/unix
+	doins *.h
+	insinto /usr/${mylibdir}/tcl${v1}/include/generic
+	doins "${SPARENT}"/generic/*.h
+	rm -f "${ED}"/usr/${mylibdir}/tcl${v1}/include/generic/{tcl,tclDecls,tclPlatDecls}.h || die
+
+	# install symlink for libraries
+	dosym libtcl${v1}$(get_libname) /usr/${mylibdir}/libtcl$(get_libname)
+	dosym libtclstub${v1}.a /usr/${mylibdir}/libtclstub.a
+
+	if multilib_is_native_abi; then
+		dosym tclsh${v1} /usr/bin/tclsh
+		dodoc "${SPARENT}"/{ChangeLog*,README,changes}
+	fi
+}
+
+pkg_postinst() {
+	for version in ${REPLACING_VERSIONS}; do
+		if ! version_is_at_least 8.6 ${version}; then
+			echo
+			ewarn "You're upgrading from <${P}, you must recompile the other"
+			ewarn "packages on your system that link with tcl after the upgrade"
+			ewarn "completes. To perform this action, please run revdep-rebuild"
+			ewarn "in package app-portage/gentoolkit."
+			ewarn "If you have dev-lang/tk and dev-tcltk/tclx installed you should"
+			ewarn "upgrade them before this recompilation, too,"
+			echo
+		fi
+	done
+}