Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
9d65439ff4
ModernUO mandated -dev packages on production servers for one reason:
DllImport never asks for a versioned SONAME, so libdeflate.so.0 and
libargon2.so.1 sitting in /usr/lib went unfound and the -dev package's
unversioned symlink was the only thing making resolution work. That is
fixed in the binding packages, so pick them up and stop asking for
build tooling on machines that compile nothing.
LibDeflate.Bindings 1.0.3 -> 1.0.4
Argon2.Bindings 1.17.0 -> 1.19.0
Also drops zstd, on every platform including macOS. ZstdNet bundles
libzstd for linux-x64, linux-arm64, osx-x64, osx-arm64 and win, and
nothing shells out to the CLI. Verified: the 15 ManagedArchive
round-trip tests pass in a container with no zstd package installed.
NativeLibraryChecker now asks whether the loader can find each library
rather than whether a named package is installed. Package-name checks
are what forced -dev in the first place, and no hardcoded name works
for ICU anyway: its apt package is release-specific (libicu74 on 24.04,
libicu76 on Alpine, libicu77 on Fedora). ldconfig -p is version
agnostic and is the loader's own cache, so one code path replaces the
apt/dnf/generic split.
ldconfig is treated as a positive signal only. musl's exits 0 while
producing no usable cache, so trusting a negative reported every
library missing on Alpine when all were installed; anything it does not
vouch for is now dlopen'd before being called missing. That fallback
bounds the .so.N probe per library, because a single small bound
reports ICU missing when it is present.
CI installs runtime packages only, deliberately: installing -dev there
would restore the unversioned symlink and mask the very resolution this
depends on, so a regression would sail through.
Adds --check-prereqs. The interactive flow was the only path that ran
these checks, so there was no way to verify a deployment target from a
script or a container.
Audited the rest of the codebase for the same hazard. ModernUO's only
other native imports are ws2_32.dll, which is always present on
Windows, and libc in SocketHelper. libc is not affected even though
libc.so is a libc6-dev linker script: DllImport("libc") was verified to
resolve and call successfully on both glibc and musl with no -dev
package installed. Nothing else P/Invokes, and no code here registers a
DllImportResolver.
Verified with 1.0.4 and 1.19.0: build plus 810 Server.Tests and 642
UOContent.Tests, and --check-prereqs reporting correctly on Debian,
Ubuntu, Fedora and Alpine with only the runtime packages installed.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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| branding | ||
| dev-docs | ||
| Distribution/Data | ||
| Projects | ||
| tools | ||
| .cursorrules | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| AGENTS.md | ||
| azure-pipelines.yml | ||
| CLAUDE.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Directory.Build.props | ||
| FAQ.md | ||
| GEMINI.md | ||
| global.json | ||
| LICENSE | ||
| ModernUO.slnx | ||
| publish.cmd | ||
| publish.ps1 | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| SPONSORS.md | ||
| stylecop.json | ||
| THIRD-PARTY-NOTICES | ||
| version.json | ||
ModernUO 
Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Required Frameworks
All Operating Systems
Windows
Development
Supported IDEs
Getting Started
- Install prerequisite requirements
- Clone this repository (or download the latest):
git clone https://github.com/modernuo/ModernUO.git
- Open
ModernUO.slnto start developing
Building/Publishing
Interactive Mode (Recommended for new users)
Run ./publish.cmd (Windows) or ./publish.sh (Linux/macOS) with no arguments to launch the guided build tool. It will:
- Check prerequisites (.NET SDK, native libraries)
- Walk you through configuration and platform selection
- Build and publish the server to the
Distributiondirectory - Show deployment instructions for cross-compiled builds
Command Line
./publish.cmd [release|debug] [os] [arch]
os- Supported operating systemsarchx64- Intel/AMD 64-bitarm64- ARM 64-bit
Linux Prerequisites
Fedora, CentOS, RHEL, AlmaLinux, Rocky, etc
dnf upgrade --refresh -y
# RHEL-family distributions (CentOS Stream, AlmaLinux, Rocky, RHEL) need CRB and EPEL enabled.
# Fedora skips this block.
dnf install -y dnf-plugins-core
dnf config-manager --set-enabled crb
dnf install -y epel-release
# Prerequisites
dnf install -y findutils libicu libdeflate libargon2
Ubuntu, Debian, etc
apt-get update -y
apt-get install -y libicu-dev libdeflate0 libargon2-1
Only the runtime libraries are needed — the -dev/-devel packages are not. ICU is the exception
on Debian and Ubuntu, where the runtime package carries the ABI version in its name (libicu74,
libicu76, …) and there is no stable alias, so libicu-dev is the version-independent way to pull
it in. Run ./build-tool --check-prereqs to print the exact packages your release needs.
zstd is no longer listed because ZstdNet bundles libzstd for every platform.
OSX Requirements
brew install icu4c libdeflate argon2
Running the Server
- Follow the publish instructions
- The
Distributiondirectory is portable — copy it to your production server for deployment - Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory - On first run, the server will prompt you to configure game data file locations
Troubleshooting / FAQ
- See FAQ
Want to sponsor?
Thank you for supporting us! You can find out how by visiting the sponsors page.
Collaborators
Thanks
- RunUO Team & Community
- Voxpire, the ServUO Team & Community
- Karasho, Jaedan and the ClassicUO Community
Development Tools & Plugins provided with ♥ by
Code Signing Policy
Free code signing provided by SignPath.io, certificate by SignPath Foundation.
This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it
Teams & Roles
Approvers & Committers: Development Team