diff --git a/.gitignore b/.gitignore
index 6876a7c..32f2c9b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1 @@
/Mars_4_1.jar
-/Mars4_3.jar
-/Mars4_4.jar
-/Mars4_5.jar
diff --git a/Mars b/Mars
index ddea40a..389042b 100644
--- a/Mars
+++ b/Mars
@@ -1,23 +1,5 @@
#!/bin/sh
-#
-# Mars script
-# JPackage Project
-# Source functions library
-_prefer_jre="true"
. /usr/share/java-utils/java-functions
-# Configuration
-MAIN_CLASS="Mars"
-BASE_FLAGS="-Dswing.aatext=true -Dawt.useSystemAAFontSettings=on"
-BASE_OPTIONS=""
-BASE_JARS="Mars"
-
-# Set parameters
-set_jvm
-set_classpath $BASE_JARS
-set_flags $BASE_FLAGS
-set_options $BASE_OPTIONS
-
-# Let's start
-run "$@"
+_JAVA_OPTIONS="-Dswing.aatext=true -Dawt.useSystemAAFontSettings=on" java -jar /usr/share/java/Mars.jar
diff --git a/Mars.spec b/Mars.spec
index af4f97b..161bc6f 100644
--- a/Mars.spec
+++ b/Mars.spec
@@ -1,22 +1,23 @@
Name: Mars
-Version: 4.5
-Release: 33%{?dist}
+Version: 4.1
+Release: 3%{?dist}
Summary: An interactive development environment for programming in MIPS assembly language
+Group: Development/Tools
License: MIT
-URL: https://dpetersanderson.github.io/
-Source0: https://github.com/dpetersanderson/MARS/releases/download/v.4.5.1/Mars4_5.jar
+URL: http://courses.missouristate.edu/KenVollmar/MARS/
+Source0: http://courses.missouristate.edu/KenVollmar/MARS/MARS_4_1_Jan_2011/Mars_4_1.jar
Source1: Mars
Source2: Mars.desktop
-Source3: build.xml
+BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
BuildArch: noarch
-ExclusiveArch: %{java_arches} noarch
-BuildRequires: ant-openjdk25
-BuildRequires: java-25-devel
+BuildRequires: java-devel
+BuildRequires: jpackage-utils
BuildRequires: desktop-file-utils
-Requires: java-25
+Requires: java >= 1:1.6.0
+Requires: jpackage-utils
%description
MARS is a lightweight interactive development environment (IDE) for
@@ -24,151 +25,41 @@ programming in MIPS assembly language, intended for educational-level
use with Patterson and Hennessy's Computer Organization and Design.
%prep
-%setup -q -c %{name}-%{version}
+%setup -q -c Mars-%{version}
-find . -name '*.jar' -exec rm -f '{}' \;
-find . -name '*.class' -exec rm -f '{}' \;
+find -name '*.class' -exec rm -f '{}' \;
%build
sed -i 's/\r//' MARSlicense.txt
-cp -p %{SOURCE3} build.xml
-ant
+cat << EOF > META-INF/MANIFEST.MF
+Manifest-Version: 1.0
+Main-Class: Mars
+EOF
+
+find . -name "*.java" -exec javac '{}' \;
+jar cmf META-INF/MANIFEST.MF Mars.jar PseudoOps.txt Config.properties Syscall.properties Settings.properties MARSlicense.txt mainclass.txt CreateMarsJar.bat Mars.java Mars.class docs help images mars
%install
-install -Dpm 644 %{name}.jar ${RPM_BUILD_ROOT}%{_javadir}/%{name}.jar
-install -Dpm 755 %{SOURCE1} ${RPM_BUILD_ROOT}%{_bindir}/%{name}
+rm -rf $RPM_BUILD_ROOT
+install -Dpm 644 Mars.jar ${RPM_BUILD_ROOT}%{_javadir}/Mars.jar
+install -Dpm 755 %{SOURCE1} ${RPM_BUILD_ROOT}%{_bindir}/Mars
desktop-file-install \
--add-category="Development" \
--dir=${RPM_BUILD_ROOT}%{_datadir}/applications \
%{SOURCE2}
+%clean
+rm -rf $RPM_BUILD_ROOT
+
%files
-%{_javadir}/%{name}.jar
-%{_bindir}/%{name}
+%defattr(-,root,root,-)
+%{_javadir}/*
+%{_bindir}/*
%{_datadir}/applications/Mars.desktop
%doc MARSlicense.txt
%changelog
-* Fri Jan 16 2026 Fedora Release Engineering - 4.5-33
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_44_Mass_Rebuild
-
-* Mon Jul 28 2025 jiri vanek - 4.5-32
-- Rebuilt for java-25-openjdk as preffered jdk
-
-* Wed Jul 23 2025 Fedora Release Engineering - 4.5-31
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild
-
-* Thu Jan 16 2025 Fedora Release Engineering - 4.5-30
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild
-
-* Wed Jan 01 2025 W. Michael Petullo - 4.5-29
-- Adjust to Mars moving to GitHub
-
-* Wed Jul 17 2024 Fedora Release Engineering - 4.5-28
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild
-
-* Wed May 22 2024 Marian Koncek - 4.5-27
-- Use system Java version
-
-* Tue Feb 27 2024 Jiri Vanek - 4.5-26
-- Rebuilt for java-21-openjdk as system jdk
-
-* Mon Jan 22 2024 Fedora Release Engineering - 4.5-25
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild
-
-* Fri Jan 19 2024 Fedora Release Engineering - 4.5-24
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild
-
-* Wed Jul 19 2023 Fedora Release Engineering - 4.5-23
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild
-
-* Mon Jul 17 2023 W. Michael Petullo - 4.5-22
-- Remove jpackage-utils requirement; it is retired and not needed
-
-* Wed Jan 18 2023 Fedora Release Engineering - 4.5-21
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild
-
-* Thu Aug 18 2022 W. Michael PEtullo - 4.5-20
-- Build using Java 17
-
-* Wed Jul 20 2022 Fedora Release Engineering - 4.5-19
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_37_Mass_Rebuild
-
-* Fri Jul 08 2022 Jiri Vanek - 4.5-18
-- Rebuilt for Drop i686 JDKs
-
-* Sat Feb 05 2022 Jiri Vanek - 4.5-17
-- Rebuilt for java-17-openjdk as system jdk
-
-* Wed Jan 19 2022 Fedora Release Engineering - 4.5-16
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild
-
-* Wed Jul 21 2021 Fedora Release Engineering - 4.5-15
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild
-
-* Mon Jan 25 2021 Fedora Release Engineering - 4.5-14
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
-
-* Mon Jul 27 2020 Fedora Release Engineering - 4.5-13
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
-
-* Sat Jul 11 2020 Jiri Vanek - 4.5-12
-- Rebuilt for JDK-11, see https://fedoraproject.org/wiki/Changes/Java11
-
-* Tue Jan 28 2020 Fedora Release Engineering - 4.5-11
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild
-
-* Wed Jul 24 2019 Fedora Release Engineering - 4.5-10
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild
-
-* Thu Jan 31 2019 Fedora Release Engineering - 4.5-9
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild
-
-* Fri Oct 05 2018 W. Michael Petullo - 4.5-8
-- Fix BZ #1634466 by requiring java-1.8.0-openjdk
-
-* Thu Jul 12 2018 Fedora Release Engineering - 4.5-7
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild
-
-* Wed Feb 07 2018 Fedora Release Engineering - 4.5-6
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
-
-* Wed Jul 26 2017 Fedora Release Engineering - 4.5-5
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Mass_Rebuild
-
-* Fri Feb 10 2017 Fedora Release Engineering - 4.5-4
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
-
-* Wed Feb 03 2016 Fedora Release Engineering - 4.5-3
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_24_Mass_Rebuild
-
-* Tue Jun 16 2015 Fedora Release Engineering - 4.5-2
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_23_Mass_Rebuild
-
-* Sat May 30 2015 Scott Tsai - 4.5-1
-- Upstream 4.5
-
-* Fri Jun 06 2014 Fedora Release Engineering - 4.3-3
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_21_Mass_Rebuild
-
-* Fri Aug 02 2013 Fedora Release Engineering - 4.3-2
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_20_Mass_Rebuild
-
-* Mon Jun 24 2013 Mat Booth - 4.3-1
-- Fix class not found exceptions at startup, rhbz#828973
-- Also update to latest upstream
-- Write a real build script to create the jar
-
-* Wed Feb 13 2013 Fedora Release Engineering - 4.1-6
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_19_Mass_Rebuild
-
-* Wed Jul 18 2012 Fedora Release Engineering - 4.1-5
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_18_Mass_Rebuild
-
-* Thu Jan 12 2012 Fedora Release Engineering - 4.1-4
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_17_Mass_Rebuild
-
* Sun Mar 06 2011 W. Michael Petullo - 4.1-3
- Ensure proper end of line encoding in MARSlicense.txt
- Add rm -rf $RPM_BUILD_ROOT
diff --git a/build.xml b/build.xml
deleted file mode 100644
index 6f14f3b..0000000
--- a/build.xml
+++ /dev/null
@@ -1,15 +0,0 @@
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
diff --git a/sources b/sources
index c3445c8..4e4957d 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-4709fae736e6c9d4078ea4b21e0be1e9 Mars4_5.jar
+a439e6114c3746f59ce5f0a95189f9c5 Mars_4_1.jar