diff --git a/llvm-core/libclc/Manifest b/llvm-core/libclc/Manifest
index b318b3f6a8304..3bfe262832a91 100644
--- a/llvm-core/libclc/Manifest
+++ b/llvm-core/libclc/Manifest
@@ -16,5 +16,6 @@ DIST llvm-project-22.1.3.src.tar.xz 167045212 BLAKE2B 4ee4a2ab5ac5f93b7d727ec4b4
 DIST llvm-project-22.1.3.src.tar.xz.sig 119 BLAKE2B b732e64dc681f12815c10ab1c83e492b172189717653f0503c6633e0b3844a57fc39de9cb8fa83cf141f9e8b0736c384b9f04275f025889ed0b466da8448b2f1 SHA512 153a0d174492a0facd061b5cfa3e18dbf946cc0c7d1fb50f4d961410d41cea1f355515fd3e892be676b8b34d61a21962c48acb90aa5d310d05cf6452053e52ad
 DIST llvm-project-22.1.4.src.tar.xz 167028880 BLAKE2B cd867371fecc8b4771c919a4d966cec25539dbaff5398e9c62ab5fe2f82b97bcc097f2319194cb796f6ee874b83c001ece5dc2d2e41c8807f88d91e67b71cf61 SHA512 9f9e84110a4bb0f0dd296eaed4acb4fd3a58838efe62bb88671399440ba4750ba8bd7e6d072e61a9946e38e5c9d5e50575b95964850769c51cd517bdf7425bb8
 DIST llvm-project-22.1.4.src.tar.xz.sig 119 BLAKE2B ff8004fd03f1d5be9da33ddf19b9c4d9408f0dfb0e9e141eeb3cffec4fd285017f913b8f624a7aa1316c228928abb95832aabea43712507f4f644cf59e757bc8 SHA512 29287637e8c2e40666c6cca054622f894a132925d532017c0f3144573757cce50f85dcc356f48b335dee7115627ff249b287ad821075835314dce0dfbc733b8a
+DIST llvm-project-99457c368586b1debf49f55b3a0684317f5f298d.tar.gz 269907211 BLAKE2B aae5040ece1fa0eacd32468feee9896d614b7e91044ef504df2c80fc57fb42d2db162f01cfdd9c91c7e80fb9fa109440b6887451c96227f47308eb99d9249ef9 SHA512 0e865b56b8f3bf3f7e0fb9a5dfaa97b7d82c915e14474d07d7c036641f68727f2a81179110e3a1c3b424e0233d55589c568fcde2a98aec3a0882ab3a45c62e6c
 DIST llvm-project-af6521fb3a36149cd69d83bfdf87ed26e59a14a2.tar.gz 265801058 BLAKE2B 3bbaee50354a8c67f4ebfbcbd0ed5d8658af082602a821d1e6d716d0c2f2952c817d594a1d8f573f0b54176ad18b23742db07d6471c72cca6f1082038ea95419 SHA512 70d3b9f95a3a895450da1d77657108a70d4910f0d78c7310b340bed2a2571b0bf5631dee21e8b4c57ebfc756a9e44cc34c2b6a0ac5354a3d500fcfe198a25849
 DIST llvm-project-dd0c5ebe69e580066de100c8c2ba5430a1aeee44.tar.gz 266653424 BLAKE2B db934eaffdaa71d472f6a83b60a0663027f4ecec1e335e296fddbe1c1e6bc4652014c4009a78a4a96f57c61b0976f554d410fde63a582a29b716a75a89a1e850 SHA512 8700d97ef327fae8e124c578537033a72cbc9cfade9a283d59e0b99e7c8a5a9a8427ec93c1324d284547f173967b911d0e4535751fca04d35f92250139970ce1
diff --git a/llvm-core/libclc/libclc-23.0.0_pre20260421.ebuild b/llvm-core/libclc/libclc-23.0.0_pre20260421.ebuild
new file mode 100644
index 0000000000000..72ffe8ffe2096
--- /dev/null
+++ b/llvm-core/libclc/libclc-23.0.0_pre20260421.ebuild
@@ -0,0 +1,90 @@
+# Copyright 1999-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+LLVM_COMPAT=( 23 )
+PYTHON_COMPAT=( python3_{11..14} )
+inherit cmake llvm.org llvm-r1 multibuild python-any-r1
+
+DESCRIPTION="OpenCL C library"
+HOMEPAGE="https://libclc.llvm.org/"
+
+LICENSE="Apache-2.0-with-LLVM-exceptions || ( MIT BSD )"
+SLOT="0"
+IUSE="+spirv test video_cards_nvidia video_cards_radeonsi"
+RESTRICT="!test? ( test )"
+
+BDEPEND="
+	${PYTHON_DEPS}
+	$(llvm_gen_dep '
+		llvm-core/clang:${LLVM_SLOT}
+	')
+	spirv? (
+		>=dev-util/spirv-llvm-translator-23:*
+	)
+	test? (
+		$(python_gen_any_dep '
+			dev-python/lit[${PYTHON_USEDEP}]
+		')
+	)
+"
+
+LLVM_COMPONENTS=( libclc )
+llvm.org_set_globals
+
+pkg_setup() {
+	llvm-r1_pkg_setup
+	python-any-r1_pkg_setup
+}
+
+src_configure() {
+	MULTIBUILD_VARIANTS=(
+		"clspv--"
+		"clspv64--"
+	)
+
+	use spirv && MULTIBUILD_VARIANTS+=(
+		"spirv-mesa3d-"
+		"spirv64-mesa3d-"
+	)
+	use video_cards_nvidia && MULTIBUILD_VARIANTS+=(
+		"nvptx64--"
+		"nvptx64--nvidiacl"
+		"nvptx64-nvidia-cuda"
+	)
+	use video_cards_radeonsi && MULTIBUILD_VARIANTS+=(
+		"amdgcn-amd-amdhsa-llvm"
+	)
+
+	multibuild_foreach_variant my_configure
+}
+
+my_configure() {
+	local mycmakeargs=(
+		-DCMAKE_CLC_COMPILER="$(type -P clang-${LLVM_MAJOR})"
+		-DLLVM_RUNTIMES_TARGET="${MULTIBUILD_VARIANT}"
+		-DLLVM_INCLUDE_TESTS="$(usex test)"
+	)
+
+	use test && mycmakeargs+=(
+		-DLLVM_EXTERNAL_LIT="${EPREFIX}/usr/bin/lit"
+		-DLLVM_LIT_ARGS="$(get_lit_flags)"
+	)
+
+	cmake_src_configure
+}
+
+src_compile() {
+	multibuild_foreach_variant cmake_src_compile
+}
+
+src_test() {
+	# respect TMPDIR!
+	local -x LIT_PRESERVES_TMP=1
+	multibuild_foreach_variant cmake_build check-libclc
+}
+
+src_install() {
+	multibuild_foreach_variant cmake_src_install
+}