diff --git a/kde-apps/kalzium/Manifest b/kde-apps/kalzium/Manifest
index 14dc29ec2574..387b7ee652e4 100644
--- a/kde-apps/kalzium/Manifest
+++ b/kde-apps/kalzium/Manifest
@@ -1 +1,2 @@
 DIST kalzium-25.08.3.tar.xz 22663696 BLAKE2B 39aa36c5e3e14cec619b2bc53b228f0e5faafdee7cf749b27547f2e03d3d95c6637b3367d4f1b04138f0383d70256b2701910edb60945a5eedec08f59b42a95d SHA512 ef7b346d5c851389cefd2c30ab4a2f648e2851c6fd4bbc917f6cbbdb612545c5d594865bd48e147b7ba9a0d101b24e840017334fb28522d9602068e2d22c2590
+DIST kalzium-25.12.0.tar.xz 22666820 BLAKE2B 5a2cd5029d75f89d0820ddab0c2aadfe9fa0729a7d7f7d341e16b61e90a9aae2c0c26b514df25de8dd2fbe82eed1f5ed153cfd1032db495fa2ad530d774173eb SHA512 ebb8723ac3e88a2a652ec663cd76486b792e7c687a53d20257df51a53f93137fa0889ad4ed1a586fe7b5cab61e635edf3e3970b6c0aa6344ca9009cd5d7adf6a
diff --git a/kde-apps/kalzium/kalzium-25.12.0.ebuild b/kde-apps/kalzium/kalzium-25.12.0.ebuild
new file mode 100644
index 000000000000..e975cd55bb8a
--- /dev/null
+++ b/kde-apps/kalzium/kalzium-25.12.0.ebuild
@@ -0,0 +1,69 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+ECM_HANDBOOK="forceoptional"
+KFMIN=6.19.0
+QTMIN=6.9.1
+inherit ecm gear.kde.org flag-o-matic xdg
+
+DESCRIPTION="Periodic table of the elements"
+HOMEPAGE="https://apps.kde.org/kalzium/"
+
+LICENSE="GPL-2" # TODO: CHECK
+SLOT="6"
+KEYWORDS="~amd64 ~arm64 ~x86"
+IUSE="solver"
+
+# TODO: IUSE="editor"
+# 	editor? (
+# 		dev-cpp/eigen:3
+# 		>=dev-qt/qtopengl-${QTMIN}:6
+# 		>=kde-frameworks/knewstuff-${KFMIN}:6
+# 		sci-chemistry/openbabel:=
+# 		>=sci-libs/avogadrolibs-1.93[qt6]
+# 	)
+DEPEND="
+	>=dev-qt/qt5compat-${QTMIN}:6
+	>=dev-qt/qtbase-${QTMIN}:6[gui,widgets,xml]
+	>=dev-qt/qtdeclarative-${QTMIN}:6
+	>=dev-qt/qtscxml-${QTMIN}:6
+	>=dev-qt/qtsvg-${QTMIN}:6
+	>=kde-frameworks/kcompletion-${KFMIN}:6
+	>=kde-frameworks/kconfig-${KFMIN}:6
+	>=kde-frameworks/kconfigwidgets-${KFMIN}:6
+	>=kde-frameworks/kcoreaddons-${KFMIN}:6
+	>=kde-frameworks/kcrash-${KFMIN}:6
+	>=kde-frameworks/ki18n-${KFMIN}:6
+	>=kde-frameworks/kio-${KFMIN}:6
+	>=kde-frameworks/kitemviews-${KFMIN}:6
+	>=kde-frameworks/kplotting-${KFMIN}:6
+	>=kde-frameworks/ktextwidgets-${KFMIN}:6
+	>=kde-frameworks/kunitconversion-${KFMIN}:6
+	>=kde-frameworks/kwidgetsaddons-${KFMIN}:6
+	>=kde-frameworks/kxmlgui-${KFMIN}:6
+	solver? ( dev-ml/facile:=[ocamlopt] )
+"
+RDEPEND="${DEPEND}
+	sci-chemistry/chemical-mime-data
+"
+
+PATCHES=( "${FILESDIR}/${PN}-21.03.90-cmake.patch" )
+
+src_configure() {
+	# Fix missing finite()
+	[[ ${CHOST} == *-solaris* ]] && append-cppflags -DHAVE_IEEEFP_H
+
+	local mycmakeargs=(
+		-DCMAKE_DISABLE_FIND_PACKAGE_OpenBabel3=ON # TODO: bug 823101
+		-DCMAKE_DISABLE_FIND_PACKAGE_Eigen3=ON
+# 		$(cmake_use_find_package editor Eigen3)
+# 		$(cmake_use_find_package editor AvogadroLibs)
+# 		$(cmake_use_find_package editor OpenBabel2)
+# 		$(cmake_use_find_package solver OCaml)
+# 		$(cmake_use_find_package solver Libfacile)
+	)
+
+	ecm_src_configure
+}