diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51e9a02..db8406f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,5 @@
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 2.8)
 project(qcustomplot)
-include(GNUInstallDirs)
 
 set(LIB_VER "" CACHE STRING "Library version")
 set(QT_VER "6" CACHE STRING "Target Qt version")
@@ -24,12 +23,12 @@ 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 ${CMAKE_INSTALL_BINDIR}
-  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  RUNTIME DESTINATION bin
+  LIBRARY DESTINATION lib${LIB_SUFFIX}
+  ARCHIVE DESTINATION lib${LIB_SUFFIX}
 )
 
 # Headers
 install(FILES qcustomplot.h
-  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+  DESTINATION include
 )
diff --git a/qcustomplot.spec b/qcustomplot.spec
index 87b1b81..bbdea16 100644
--- a/qcustomplot.spec
+++ b/qcustomplot.spec
@@ -4,15 +4,9 @@
 %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:        14%{?dist}
+Release:        4%{?dist}
 Summary:        Qt widget for plotting and data visualization
 
 License:        GPL-3.0-or-later
@@ -24,9 +18,7 @@ BuildRequires:  cmake
 BuildRequires:  ninja-build
 BuildRequires:  gcc-c++
 BuildRequires:  qt5-qtbase-devel
-%if %{with qt6}
 BuildRequires:  qt6-qtbase-devel
-%endif
 
 
 %description
@@ -40,6 +32,7 @@ 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.
@@ -59,9 +52,9 @@ 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.
@@ -74,12 +67,11 @@ This package contains the Qt6 version.
 
 %package        qt6-devel
 Summary:        Development files for %{name} (Qt6)
-Requires:       %{name}-qt6%{?_isa} = %{version}-%{release}
+Requires:       %{name}-qt5%{?_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
@@ -101,35 +93,23 @@ 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
 
-install -d %{buildroot}%{_libdir}/pkgconfig/
-
-cat > %{buildroot}%{_libdir}/pkgconfig/%{name}-qt5.pc <<EOF
-libdir=%{_libdir}
-includedir=%{_includedir}
-
-Name: %{name}
-Description: %{summary}
-Version: %{version}
-Cflags: -I\${includedir}
-Libs: -L\${libdir} -lqcustomplot-qt5
-EOF
-
-%if %{with qt6}
 %define _vpath_builddir %{_target_platform}-qt6
 %cmake_install
 
-cat > %{buildroot}%{_libdir}/pkgconfig/%{name}-qt6.pc <<EOF
+# pkg-config files
+for qtver in -qt5 -qt6; do
+
+install -d %{buildroot}%{_libdir}/pkgconfig/
+cat > %{buildroot}%{_libdir}/pkgconfig/%{name}$qtver.pc <<EOF
 libdir=%{_libdir}
 includedir=%{_includedir}
 
@@ -137,9 +117,10 @@ Name: %{name}
 Description: %{summary}
 Version: %{version}
 Cflags: -I\${includedir}
-Libs: -L\${libdir} -lqcustomplot-qt6
+Libs: -L\${libdir} -lqcustomplot$qtver
 EOF
-%endif
+
+done
 
 
 %files qt5
@@ -151,7 +132,6 @@ EOF
 %{_libdir}/libqcustomplot-qt5.so
 %{_libdir}/pkgconfig/%{name}-qt5.pc
 
-%if %{with qt6}
 %files qt6
 %license GPL.txt
 %{_libdir}/libqcustomplot-qt6.so.*
@@ -160,7 +140,6 @@ EOF
 %{_includedir}/qcustomplot.h
 %{_libdir}/libqcustomplot-qt6.so
 %{_libdir}/pkgconfig/%{name}-qt6.pc
-%endif
 
 %files doc
 %license GPL.txt
@@ -169,36 +148,6 @@ EOF
 
 
 %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
-
-* Fri Jan 20 2023 Fedora Release Engineering <releng@fedoraproject.org> - 2.1.1-5
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild
-
 * Tue Nov 29 2022 Sandro Mani <manisandro@gmail.com> - 2.1.1-4
 - Set CMAKE_AUTOMOC to ON
 - Fix lib version take two