[libnatpmp] Add new port

[Joel Kiptoo (Kiptoo-Deus)]

Adds a port for libnatpmp, a client-side NAT traversal library implementing NAT-PMP (BSD-3-Clause). Resolves #52796.

Versioning. Upstream has no git tags, and its VERSION file still reads 20120821 while the repository was last updated in April 2025. The port pins commit 134fc89e with "version-date": "2025-04-03". Other distributions version this library by date for the same reason — Arch, for instance, packages it as 20230423.

No CMake package config. Upstream's CMakeLists.txt installs no export set and generates no config file, so vcpkg_cmake_config_fixup is not called. Consumers use the natpmp pkg-config module, which vcpkg's automatically generated usage text already reports correctly.

The natpmpc executable upstream installs is relocated to tools/libnatpmp/ via vcpkg_copy_tools.

• Changes comply with the maintainer guide.
• The packaged project is mature and ready for broad sharing with vcpkg users
  • Has a release at least 6 months old or 6 months of demonstrated public development — no tagged releases exist, but the project has been under continuous public development since 2007, with commits through April 2025.
• The packaged project shows strong association with the chosen port name. Check this box if at least one of the following criteria is met:
  • The project is amongst the first web search results for "libnatpmp" — the upstream repository and its homepage both appear, and the library is packaged by Debian, Ubuntu, Alpine, Arch, FreeBSD and Homebrew. (Screenshot to follow.)
• Optional dependencies of the build are all controlled by the port — upstream has no optional dependencies.
• The versioning scheme in vcpkg.json matches what upstream says.
• The license declaration in vcpkg.json matches what upstream says — LICENSE reads "BSD 3-Clause License, Copyright (c) 2007-2022, Thomas BERNARD".
• The installed as the "copyright" file matches what upstream says.
• The source code of the component installed comes from an authoritative source.
• The generated "usage text" is brief and accurate — no usage file added, as the automatically generated pkg-config usage is correct.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Exactly one version is added in each modified versions file.

[Joel Kiptoo (Kiptoo-Deus)]

@microsoft-github-policy-service agree

[Billy O'Neal (BillyONeal)]

GPT 5.6 Sol reports:

The supported Windows static package cannot be consumed. The installed upstream natpmp_declspec.h defaults public APIs to __declspec(dllimport) on Windows unless NATPMP_STATICLIB is defined, but neither the installed metadata nor direct usage supplies that definition. Consequently, both Release and Debug consumers fail to link through direct usage and pkg-config.

Would you consider merging Kiptoo-Deus#1 which fixes this?

Thanks for the new port!

[Joel Kiptoo (Kiptoo-Deus)]

Thanks Billy O'Neal (@BillyONeal)! Merged your fix (Kiptoo-Deus#1). CI is green across all triplets, including the Windows static ones. Ready for another look when you have time.

[Billy O'Neal (BillyONeal)]

Thanks!