diff --git a/science/kalzium/Makefile b/science/kalzium/Makefile
index dddcc89f4e2b..8a6ab473699a 100644
--- a/science/kalzium/Makefile
+++ b/science/kalzium/Makefile
@@ -1,35 +1,35 @@
 PORTNAME=	kalzium
 DISTVERSION=	${KDE_APPLICATIONS_VERSION}
+PORTREVISION=	1
 CATEGORIES=	science education kde kde-applications
 
 MAINTAINER=	kde@FreeBSD.org
 COMMENT=	Periodic table of elements for KDE
 WWW=		https://www.kde.org/applications/education/kalzium
 
 LICENSE=	GPLv2 LGPL20 GFDL
 LICENSE_COMB=	multi
 
-LIB_DEPENDS=	libopenbabel.so:science/openbabel \
-		libAvogadroCore.so:science/avogadrolibs
 BUILD_DEPENDS=	${LOCALBASE}/lib/ocaml/facile/facile.a:math/facile \
 		${LOCALBASE}/libdata/pkgconfig/chemical-mime-data.pc:science/chemical-mime-data
+LIB_DEPENDS=	libAvogadroCore.so:science/avogadrolibs \
+		libopenbabel.so:science/openbabel
 RUN_DEPENDS=	${LOCALBASE}/libdata/pkgconfig/chemical-mime-data.pc:science/chemical-mime-data
 
-USES=		cmake compiler:c++11-lang desktop-file-utils gettext gl kde:6 \
-		ocaml:build pkgconfig qt:6 tar:xz xorg
-USE_GL=		gl glew glu
-USE_KDE=	archive attica auth bookmarks codecs completion config \
-		configwidgets coreaddons crash doctools guiaddons i18n \
-		iconthemes itemmodels itemviews jobwidgets kio newstuff \
-		notifications parts plotting service solid sonnet textwidgets \
-		unitconversion widgetsaddons windowsystem xmlgui \
+USES=		cmake compiler:c++17-lang desktop-file-utils gettext-tools gl \
+		kde:6 ocaml:build pkgconfig qt:6 tar:xz xorg
+USE_GL=		opengl
+USE_KDE=	attica colorscheme completion config configwidgets \
+		coreaddons crash doctools guiaddons i18n itemviews \
+		jobwidgets kio newstuff plotting service sonnet textwidgets \
+		unitconversion widgetsaddons xmlgui \
 		ecm:build
-USE_QT=		base scxml
-USE_XORG=	x11
 USE_LDCONFIG=	yes
+USE_QT=		5compat base declarative scxml svg
+USE_XORG=	x11
 
 PIE_UNSAFE=	yes
 
 OPTIONS_DEFINE=	DOCS
 
 .include <bsd.port.mk>
diff --git a/science/kalzium/files/patch-CMakeLists.txt b/science/kalzium/files/patch-CMakeLists.txt
new file mode 100644
index 000000000000..df35dfe618f3
--- /dev/null
+++ b/science/kalzium/files/patch-CMakeLists.txt
@@ -0,0 +1,25 @@
+Remove unused KF6 Archive component.
+
+The Avogadro:Gui target requires the Qt::Concurrent target to be found.
+
+--- CMakeLists.txt.orig	2026-02-28 11:23:51 UTC
++++ CMakeLists.txt
+@@ -89,7 +89,6 @@ find_package(KF6 ${KF_MIN_VERSION} REQUIRED COMPONENTS
+ )
+ 
+ find_package(KF6 ${KF_MIN_VERSION} REQUIRED COMPONENTS
+-    Archive
+     Config
+     ConfigWidgets
+     CoreAddons
+@@ -122,6 +121,10 @@ ecm_set_disabled_deprecation_versions(QT 5.14.0
+     KF 6.13
+ )
+ 
++
++if (AvogadroLibs_FOUND)
++  find_package(Qt6Concurrent ${QT_MIN_VERSION} REQUIRED)
++endif()
+ 
+ if (HAVE_OPENBABEL AND AvogadroLibs_FOUND AND Eigen3_FOUND)
+   find_package(Qt6OpenGL ${QT_MIN_VERSION} REQUIRED)
diff --git a/science/kalzium/files/patch-compoundviewer_CMakeLists.txt b/science/kalzium/files/patch-compoundviewer_CMakeLists.txt
deleted file mode 100644
index 3d724429669b..000000000000
--- a/science/kalzium/files/patch-compoundviewer_CMakeLists.txt
+++ /dev/null
@@ -1,13 +0,0 @@
-- fix linking with avogadrolibs: it fails w/out the lib specification
-- cmake's link_directories doesn't work for some reason
-
---- compoundviewer/CMakeLists.txt.orig	2023-11-30 16:56:21 UTC
-+++ compoundviewer/CMakeLists.txt
-@@ -30,6 +30,7 @@ target_link_libraries(compoundviewer
-     AvogadroQtOpenGL
-     AvogadroQtPlugins
-     Eigen3::Eigen
-+    -L${CMAKE_INSTALL_PREFIX}/lib
- )
- 
- target_include_directories(compoundviewer PRIVATE