first try of a searx-ebuild.

www-apps/searx/Manifest

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+DIST searx-0.15.0.tar.gz 1818927 BLAKE2B bb15ec89e410a96a984ba88c98131493fbfbe9b6ad9e9048376be806f931e451d7be01adc5b662695725aabe66c11b8ff8ff94f7425a4af3068edbe5f450c8e0 SHA512 9d605ca08adc91fab27b4fd5311c9585620a9152e9f3e8b4f41f6ec7231af3efe3effdd3f8c0e6d08898c2116ef429455ec8525dad35e17329bd1e509828ba4b
+EBUILD searx-0.15.0.ebuild 1177 BLAKE2B fa3e33c02312e5677b3c98f8771d74fc3985e068fb329e353d2681f2898718772bb454781ccc459b38d2c0e9983af669e4fb4e5592a131b0c48f039b9e81882d SHA512 2303180db769119f472fb066909ba6c5d58dde6922bd5bc14587793088e016be088c6220ad13830e23b1307c4ffef86e19b3f8ef867fe21489273475769434e1

www-apps/searx/searx-0.15.0.ebuild

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+# Copyright 2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+PYTHON_COMPAT=( python2_7 python3_{4,5,6} )
+inherit user distutils-r1 #webapp
+
+DESCRIPTION="Searx is a free internet metasearch engine which aggregates results."
+HOMEPAGE="https://asciimoo.github.io/searx/index.html"
+GITHUB_USER="asciimoo"
+GITHUB_TAG="${PV}"
+SRC_URI="https://github.com/${GITHUB_USER}/${PN}/archive/v${GITHUB_TAG}.tar.gz -> ${P}.tar.gz"
+
+
+LICENSE="AGPL3"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE=""
+WEBAPP_MANUAL_SLOT="yes"
+
+DEPEND="
+		dev-python/Babel
+		virtual/libffi
+
+		dev-python/certifi
+		dev-python/flask
+		dev-python/flask-babel
+		dev-python/lxml
+		dev-python/idna
+		dev-python/pygments
+		dev-python/pyopenssl
+		dev-python/python-dateutil
+		dev-python/pyyaml
+		dev-python/requests[socks5]
+"
+RDEPEND="${DEPEND}"
+BDEPEND=""
+
+src_prepare() {
+	sed -i -e "s!'tests/.*\$!!g" \
+		-e "s!^dev_requirements.*\$!!g" \
+		-e "s!'test': dev_requirements!!g" \
+		setup.py
+	sed -i -e "s/ultrasecretkey/`openssl rand -hex 16`/g" searx/settings.yml
+	rm -rf tests
+	rm requirements-dev.txt
+	eapply_user
+}
+
+pkg_setup() {
+	enewgroup searx
+	enewuser searx -1 -1 -1 searx
+}