Add mail-client/rin

Signed-off-by: Shin'ya Minazuki <shinyoukai@laidback.moe>

mail-client/rin/Manifest

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+DIST rin-10.tar.gz 4282 BLAKE2B 6c8064863c753d536f738c6850a0c3430f7a0c4d954c137490d458c89877c8f9417efed71f0b78c644729a4509da74327c1eb366f73756d1dee5798c6e50360d SHA512 b9d9096dcea4e0a8c595aa63d9415ddd16f629522861059a6f8b44c0641ac1693d82165c3aa309095696c5a9bac72aa851c72699d71b3e67a0b7eb569511f00d

mail-client/rin/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>shinyoukai@laidback.moe</email>
+		<name>Shin'ya Minazuki</name>
+	</maintainer>
+</pkgmetadata>

mail-client/rin/rin-10.ebuild

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+# Copyright 2026 Shin'ya Minazuki
+EAPI=8
+
+inherit edo
+
+DESCRIPTION="E-mail assistant"
+HOMEPAGE=""
+SRC_URI="https://mirror.chaotic.ninja/software/${PN}/${P}.tar.gz"
+
+# ありがとうございます、諏訪子様！
+LICENSE="076-Freedom-License"
+SLOT="0"
+KEYWORDS="~amd64"
+
+DEPEND="
+	mail-client/mblaze
+	net-mail/fdm
+"
+RDEPEND="${DEPEND}"
+BDEPEND="
+	app-text/mandoc
+	dev-build/bmake
+"
+
+src_configure() {
+	elog "Populating config.mk with new values..."
+	echo "PREFIX = ${EPREFIX}/usr" > config.mk
+	echo "EXDIR = \${PREFIX}/share/examples" >> config.mk
+	echo "MANDIR = \${PREFIX}/share/man" >> config.mk
+	elog "Done."
+}
+src_compile() {
+	edo sed -e "s|%%PREFIX%%|${EPREFIX}/usr|g" -e "s|%%REV%%|${PV}|g" bin/${PN}.in > bin/${PN}
+	edo chmod 0755 bin/${PN}
+}
+src_install() {
+	# Specifically not emake because of the BSD syntax
+	# which will cause GNU make an indigestion
+	bmake DESTDIR="${D}" install
+}