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diff --git a/sci-mathematics/acl2/acl2-8.5-r2.ebuild b/sci-mathematics/acl2/acl2-8.5-r2.ebuild
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@@ -0,0 +1,92 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# NOTICE: Only SBCL (dev-lisp/sbcl) is tested for now, but probably
+#   more CL implementations can be added as alternative dependencies.
+#   With ClozureCL (dev-lisp/clozurecl) ACL2 fails to build,
+#   this might need in-depth investigation...
+
+EAPI=8
+
+inherit elisp-common
+
+DESCRIPTION="Industrial strength theorem prover, logic and programming language"
+HOMEPAGE="https://www.cs.utexas.edu/users/moore/acl2/
+	https://github.com/acl2/acl2/"
+SRC_URI="https://github.com/acl2/acl2/archive/${PV}/${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE="doc emacs"
+REQUIRED_USE="emacs? ( doc )"
+
+RDEPEND="
+	<=dev-lisp/sbcl-2.4.1:=
+	emacs? ( >=app-editors/emacs-25:* )
+"
+BDEPEND="
+	${RDEPEND}
+	doc? ( dev-lang/perl )
+"
+
+DOCS=( books/README.md )
+SITEFILE="50${PN}-gentoo.el"
+
+src_prepare() {
+	find . -type f -name "*.bak" -delete || die
+	find . -type f -name "*.orig" -delete || die
+	rm books/workshops/2003/schmaltz-al-sammane-et-al/support/acl2link || die
+
+	default
+}
+
+src_compile() {
+	emake LISP="sbcl --no-sysinit --no-userinit --disable-debugger"
+
+	use doc && emake ACL2="${S}"/saved_acl2 basic DOC
+
+	if use emacs ; then
+		local elisp_dir
+		for elisp_dir in books/emacs books/interface/emacs ; do
+			BYTECOMPFLAGS="-L ${S}/${elisp_dir}"        \
+				elisp-compile "${S}"/${elisp_dir}/*.el
+		done
+	fi
+}
+
+src_install() {
+	local saved_name=saved_acl2
+
+	sed "s|${S}|/usr/share/acl2|g" -i ${saved_name} || die
+	sed "5iexport ACL2_SYSTEM_BOOKS=/usr/share/acl2/books/"    \
+		-i ${saved_name} || die
+
+	exeinto /usr/share/acl2
+	doexe ${saved_name}
+	insinto /usr/share/acl2
+	doins ${saved_name}.core
+	dosym -r /usr/share/acl2/${saved_name} /usr/bin/acl2
+
+	if use doc ; then
+		doins -r books
+
+		HTML_DOCS=( doc/HTML/. )
+		einstalldocs
+	fi
+	if use emacs ; then
+		doins TAGS
+		elisp-install ${PN}                     \
+			books/emacs/*.el{,c}                \
+			books/interface/emacs/*.el{,c}
+		elisp-site-file-install "${FILESDIR}/${SITEFILE}"
+	fi
+}
+
+pkg_postinst() {
+	use emacs && elisp-site-regen
+}
+
+pkg_postrm() {
+	use emacs && elisp-site-regen
+}