diff --git a/net-wireless/portapack-mayhem/Manifest b/net-wireless/portapack-mayhem/Manifest
new file mode 100644
index 000000000..854247a22
--- /dev/null
+++ b/net-wireless/portapack-mayhem/Manifest
@@ -0,0 +1 @@
+DIST portapack-mayhem-1.2.tar.gz 99117711 BLAKE2B c270f0fd21a4c3973a5fa16c6fb8e5488fe81ac11e223bc0c91c0b768abd1edbfc11db1579b1052c9d8338588056922a02ce2b77eb40ac79e9a40a5eb842ceec SHA512 c9bea6a33a997faccee0e3fa4bf136977e8ed36f4779f8766c0c9aabafe20b44fbdf2bf64c384bbd83def4f5ac8ee41671a25f787ad9df5737ad862436397a20
diff --git a/net-wireless/portapack-mayhem/metadata.xml b/net-wireless/portapack-mayhem/metadata.xml
new file mode 100644
index 000000000..517b40130
--- /dev/null
+++ b/net-wireless/portapack-mayhem/metadata.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>zerochaos@gentoo.org</email>
+		<name>Rick Farina</name>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">eried/portapack-mayhem</remote-id>
+	</upstream>
+</pkgmetadata>
diff --git a/net-wireless/portapack-mayhem/portapack-mayhem-9999.ebuild b/net-wireless/portapack-mayhem/portapack-mayhem-9999.ebuild
new file mode 100644
index 000000000..fb929b13d
--- /dev/null
+++ b/net-wireless/portapack-mayhem/portapack-mayhem-9999.ebuild
@@ -0,0 +1,44 @@
+# Copyright 1999-2020 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake
+
+DESCRIPTION="Custom firmware for the HackRF SDR + PortaPack H1 addon"
+HOMEPAGE="https://github.com/eried/portapack-mayhem"
+
+LICENSE="GPL-2"
+SLOT="0"
+IUSE=""
+
+if [ "${PV}" == "9999" ]; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/eried/portapack-mayhem.git"
+	EGIT_BRANCH="gcc9.3-assert-redefinition"
+else
+	KEYWORDS="~amd64 ~arm ~x86"
+	SRC_URI="https://github.com/eried/portapack-mayhem/archive/${PV}.tar.gz -> ${P}.tar.gz"
+fi
+
+DEPEND="sys-devel/gcc-arm-none-eabi"
+PDEPEND=">=net-wireless/hackrf-tools-2015.07.2-r1
+	>=app-mobilephone/dfu-util-0.7"
+
+src_configure() {
+	strip-flags
+	filter-flags "-march=*" "-mtune=*"
+	cmake_src_configure
+}
+
+src_compile() {
+	V=1 cmake_src_compile
+}
+
+src_install() {
+	insinto /usr/share/${PN}
+	doins -r "${S}"/sdcard
+	newins ${BUILD_DIR}/firmware/portapack-h1_h2-mayhem.bin portapack-h1_h2-mayhem-${PV}.bin
+	dodir /usr/share/hackrf
+	ln -s ../${PN}/portapack-h1_h2-mayhem-${PV}.bin "${ED}/usr/share/hackrf/portapack-h1_h2-mayhem.bin" || die
+}