diff --git a/app-admin/eselect/eselect-1.4.20.ebuild b/app-admin/eselect/eselect-1.4.20.ebuild
index 338c3aba0..63490c9b4 100644
--- a/app-admin/eselect/eselect-1.4.20.ebuild
+++ b/app-admin/eselect/eselect-1.4.20.ebuild
@@ -26,6 +26,13 @@ BDEPEND="doc? ( dev-python/docutils )"
 PDEPEND="emacs? ( app-emacs/eselect-mode )
 	vim-syntax? ( app-vim/eselect-syntax )"
 
+# https://bugs.gentoo.org/905934
+src_configure() {
+	econf \
+		ac_cv_path_BASH="${EPREFIX}/bin/bash" \
+		ac_cv_path_ENV_UPDATE="${EPREFIX}/usr/sbin/env-update"
+}
+
 src_compile() {
 	emake
 	use doc && emake html
diff --git a/dev-libs/gmp/gmp-6.2.1-r5.ebuild b/dev-libs/gmp/gmp-6.2.1-r5.ebuild
index 585425499..a32e1c107 100644
--- a/dev-libs/gmp/gmp-6.2.1-r5.ebuild
+++ b/dev-libs/gmp/gmp-6.2.1-r5.ebuild
@@ -35,7 +35,10 @@ RESTRICT="!cpudetection? ( bindist )"
 BDEPEND="
 	app-arch/xz-utils
 	sys-devel/m4
+	sys-devel/flex
+	sys-devel/bison
 "
+# https://bugs.gentoo.org/905905
 
 DOCS=( AUTHORS ChangeLog NEWS README doc/configuration doc/isa_abi_headache )
 HTML_DOCS=( doc )
diff --git a/sys-apps/portage/portage-3.0.44-r1.ebuild b/sys-apps/portage/portage-3.0.44-r1.ebuild
index f6c5de541..e2df2848c 100644
--- a/sys-apps/portage/portage-3.0.44-r1.ebuild
+++ b/sys-apps/portage/portage-3.0.44-r1.ebuild
@@ -177,6 +177,11 @@ python_prepare_all() {
 	fi
 }
 
+python_compile() {
+	distutils-r1_python_compile \
+		--executable="${EPREFIX}/usr/bin/${EPYTHON}"
+}
+
 python_compile_all() {
 	local targets=()
 	use doc && targets+=( docbook )
@@ -195,6 +200,7 @@ python_install() {
 	# Install sbin scripts to bindir for python-exec linking
 	# they will be relocated in pkg_preinst()
 	distutils-r1_python_install \
+		--prefix="${EPREFIX}/usr" \
 		--system-prefix="${EPREFIX}/usr" \
 		--bindir="$(python_get_scriptdir)" \
 		--docdir="${EPREFIX}/usr/share/doc/${PF}" \
@@ -237,7 +243,7 @@ python_install_all() {
 }
 
 pkg_preinst() {
-	if ! use build; then
+	if [[ -z ${ROOT} ]] && ! use build; then
 		python_setup
 		local sitedir=$(python_get_sitedir)
 		[[ -d ${D}${sitedir} ]] || die "${D}${sitedir}: No such directory"