diff --git a/CMakeLists.txt b/CMakeLists.txt
index db8406f..51e9a02 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,6 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.5)
 project(qcustomplot)
+include(GNUInstallDirs)
 
 set(LIB_VER "" CACHE STRING "Library version")
 set(QT_VER "6" CACHE STRING "Target Qt version")
@@ -23,12 +24,12 @@ endif()
 target_link_libraries(qcustomplot Qt${QT_VER}::Core Qt${QT_VER}::Gui Qt${QT_VER}::Widgets Qt${QT_VER}::PrintSupport)
 
 install(TARGETS qcustomplot
-  RUNTIME DESTINATION bin
-  LIBRARY DESTINATION lib${LIB_SUFFIX}
-  ARCHIVE DESTINATION lib${LIB_SUFFIX}
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
 )
 
 # Headers
 install(FILES qcustomplot.h
-  DESTINATION include
+  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )
diff --git a/qcustomplot.spec b/qcustomplot.spec
index ce6ce42..87b1b81 100644
--- a/qcustomplot.spec
+++ b/qcustomplot.spec
@@ -4,9 +4,15 @@
 %global lib_ver 2.0.0
 #global pre beta
 
+%if 0%{?rhel}
+%bcond_with qt6
+%else
+%bcond_without qt6
+%endif
+
 Name:           qcustomplot
 Version:        2.1.1
-Release:        6%{?dist}
+Release:        14%{?dist}
 Summary:        Qt widget for plotting and data visualization
 
 License:        GPL-3.0-or-later
@@ -18,7 +24,9 @@ BuildRequires:  cmake
 BuildRequires:  ninja-build
 BuildRequires:  gcc-c++
 BuildRequires:  qt5-qtbase-devel
+%if %{with qt6}
 BuildRequires:  qt6-qtbase-devel
+%endif
 
 
 %description
@@ -32,7 +40,6 @@ This package contains the Qt4 version.
 
 %package        qt5
 Summary:        Qt widget for plotting and data visualization
-Requires:       %{name}-qt5%{?_isa} = %{version}-%{release}
 
 %description    qt5
 QCustomPlot is a Qt C++ widget for plotting and data visualization.
@@ -52,9 +59,9 @@ The %{name}-devel package contains libraries and header files for
 developing applications that use %{name} (Qt5).
 
 
+%if %{with qt6}
 %package        qt6
 Summary:        Qt widget for plotting and data visualization
-Requires:       %{name}-qt5%{?_isa} = %{version}-%{release}
 
 %description    qt6
 QCustomPlot is a Qt C++ widget for plotting and data visualization.
@@ -67,11 +74,12 @@ This package contains the Qt6 version.
 
 %package        qt6-devel
 Summary:        Development files for %{name} (Qt6)
-Requires:       %{name}-qt5%{?_isa} = %{version}-%{release}
+Requires:       %{name}-qt6%{?_isa} = %{version}-%{release}
 
 %description    qt6-devel
 The %{name}-devel package contains libraries and header files for
 developing applications that use %{name} (Qt6).
+%endif
 
 
 %package        doc
@@ -93,23 +101,20 @@ cp -a %{SOURCE1} .
 %cmake -DQT_VER=5 -DLIB_VER=%{lib_ver}
 %cmake_build
 
+%if %{with qt6}
 %define _vpath_builddir %{_target_platform}-qt6
 %cmake -DQT_VER=6 -DLIB_VER=%{lib_ver}
 %cmake_build
+%endif
 
 
 %install
 %define _vpath_builddir %{_target_platform}-qt5
 %cmake_install
 
-%define _vpath_builddir %{_target_platform}-qt6
-%cmake_install
-
-# pkg-config files
-for qtver in -qt5 -qt6; do
-
 install -d %{buildroot}%{_libdir}/pkgconfig/
-cat > %{buildroot}%{_libdir}/pkgconfig/%{name}$qtver.pc <<EOF
+
+cat > %{buildroot}%{_libdir}/pkgconfig/%{name}-qt5.pc <<EOF
 libdir=%{_libdir}
 includedir=%{_includedir}
 
@@ -117,10 +122,24 @@ Name: %{name}
 Description: %{summary}
 Version: %{version}
 Cflags: -I\${includedir}
-Libs: -L\${libdir} -lqcustomplot$qtver
+Libs: -L\${libdir} -lqcustomplot-qt5
 EOF
 
-done
+%if %{with qt6}
+%define _vpath_builddir %{_target_platform}-qt6
+%cmake_install
+
+cat > %{buildroot}%{_libdir}/pkgconfig/%{name}-qt6.pc <<EOF
+libdir=%{_libdir}
+includedir=%{_includedir}
+
+Name: %{name}
+Description: %{summary}
+Version: %{version}
+Cflags: -I\${includedir}
+Libs: -L\${libdir} -lqcustomplot-qt6
+EOF
+%endif
 
 
 %files qt5
@@ -132,6 +151,7 @@ done
 %{_libdir}/libqcustomplot-qt5.so
 %{_libdir}/pkgconfig/%{name}-qt5.pc
 
+%if %{with qt6}
 %files qt6
 %license GPL.txt
 %{_libdir}/libqcustomplot-qt6.so.*
@@ -140,6 +160,7 @@ done
 %{_includedir}/qcustomplot.h
 %{_libdir}/libqcustomplot-qt6.so
 %{_libdir}/pkgconfig/%{name}-qt6.pc
+%endif
 
 %files doc
 %license GPL.txt
@@ -148,6 +169,30 @@ done
 
 
 %changelog
+* Sun Oct 12 2025 Yaakov Selkowitz <yselkowi@redhat.com> - 2.1.1-14
+- Fix dependencies
+
+* Fri Jul 25 2025 Fedora Release Engineering <releng@fedoraproject.org> - 2.1.1-13
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild
+
+* Thu Jul 17 2025 Sandro Mani <manisandro@gmail.com> - 2.1.1-12
+- Raise minimum CMake version, use GNUInstallDirs
+
+* Sat Jan 18 2025 Fedora Release Engineering <releng@fedoraproject.org> - 2.1.1-11
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild
+
+* Fri Jul 19 2024 Fedora Release Engineering <releng@fedoraproject.org> - 2.1.1-10
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild
+
+* Fri Jan 26 2024 Fedora Release Engineering <releng@fedoraproject.org> - 2.1.1-9
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild
+
+* Mon Jan 22 2024 Fedora Release Engineering <releng@fedoraproject.org> - 2.1.1-8
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild
+
+* Thu Oct 05 2023 Sandro Mani <manisandro@gmail.com> - 2.1.1-7
+- Conditionalize qt6 build
+
 * Fri Jul 21 2023 Fedora Release Engineering <releng@fedoraproject.org> - 2.1.1-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild