diff --git a/games-board/megamek/files/megamek-0.34.10-source8.patch b/games-board/megamek/files/megamek-0.34.10-source8.patch
new file mode 100644
index 0000000000000..27d4596d8d926
--- /dev/null
+++ b/games-board/megamek/files/megamek-0.34.10-source8.patch
@@ -0,0 +1,22 @@
+diff --git a/build.xml b/build.xml
+index 9d3a7d6..a6732b6 100644
+--- a/build.xml
++++ b/build.xml
+@@ -60,7 +60,7 @@
+ 
+ 	<target name="compile" depends="init" description="Compile java sources into class files">
+ 		<!-- compile -->
+-		<javac debug="true" debuglevel="lines,source" target="1.5" source="1.5" destdir="${builddir}" srcdir="${srcdir}" memoryInitialSize="512m" memoryMaximumSize="512m" fork="true">
++		<javac debug="true" debuglevel="lines,source" destdir="${builddir}" srcdir="${srcdir}" memoryInitialSize="512m" memoryMaximumSize="512m" fork="true">
+ 			<classpath>
+ 				<pathelement location="${basedir}" />
+ 				<fileset dir="${libdir}" includes="*.jar" />
+@@ -208,7 +208,7 @@
+ 
+ 		<!-- compile -->
+ 		<echo message="building MegaMek from svn sources" />
+-		<javac debug="true" debuglevel="lines,source" target="1.5" source="1.5" destdir="${svnbuilddir}" srcdir="${svndir}/${srcdir}" memoryInitialSize="512m" memoryMaximumSize="512m" fork="true">
++		<javac debug="true" debuglevel="lines,source" destdir="${svnbuilddir}" srcdir="${svndir}/${srcdir}" memoryInitialSize="512m" memoryMaximumSize="512m" fork="true">
+ 			<classpath>
+ 				<pathelement location="${svndir}" />
+ 				<fileset dir="${svndir}/${libdir}" includes="*.jar" />
diff --git a/games-board/megamek/megamek-0.34.10-r3.ebuild b/games-board/megamek/megamek-0.34.10-r3.ebuild
new file mode 100644
index 0000000000000..1de1e9c1f80eb
--- /dev/null
+++ b/games-board/megamek/megamek-0.34.10-r3.ebuild
@@ -0,0 +1,60 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit desktop edos2unix java-pkg-2
+
+DESCRIPTION="Unofficial online version of the Classic BattleTech board game"
+HOMEPAGE="https://megamek.org/"
+SRC_URI="
+	https://downloads.sourceforge.net/project/megamek/Archived%20Stable/MegaMek%20v${PV}/MegaMek-v${PV}.zip
+	https://dev.gentoo.org/~ionen/distfiles/${PN}.png"
+S="${WORKDIR}"
+
+LICENSE="GPL-2+"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+
+BDEPEND="app-arch/unzip"
+DEPEND="
+	>=dev-java/ant-1.10.14-r3
+	>=virtual/jdk-1.8:*
+"
+RDEPEND=">=virtual/jre-1.8:*"
+
+PATCHES=( "${FILESDIR}/megamek-0.34.10-source8.patch" )
+
+src_prepare() {
+	default #780585
+	java-pkg-2_src_prepare
+
+	rm MegaMek.jar || die
+
+	sed -e "s|XmX|Xmx|" \
+		-e "s|/usr/share/java|${EPREFIX}/usr/share/${PN}|" \
+		-e "s|/usr/share/MegaMek|${EPREFIX}/usr/share/${PN}|" \
+		startup.sh > ${PN} || die
+	edos2unix ${PN}
+
+	# workaround encoding issues posing problems with >=jdk-1.8
+	find . -name '*.java' -exec sed -i 's/\xf6/\xc3\xb6/' {} + || die
+}
+
+src_compile() {
+	eant \
+		-Dant.build.javac.source="$(java-pkg_get-source)" \
+		-Dant.build.javac.target="$(java-pkg_get-target)"
+}
+
+src_install() {
+	dobin ${PN}
+
+	insinto /usr/share/${PN}
+	doins -r MegaMek.jar data docs l10n lib mmconf readme* # readme used at runtime
+
+	dodoc HACKING readme.txt
+
+	doicon "${DISTDIR}"/${PN}.png
+	make_desktop_entry ${PN} MegaMek
+}