Fix Linux build compatibility issues

[blasphemetheus]

Fix Linux build compatibility

Fixes build failures on modern Linux distributions (tested: Manjaro, Qt 6.10, CMake 4.0, GCC 15).

Issues Fixed

File	Issue	Fix
CMakeLists.txt	zlib linker error (undefined reference to deflateInit_)	Use zlib pkg-config instead of zlib-ng for standard API
Externals/minizip-ng/CMakeLists.txt	CMake configure fails (Unknown command check_function_exists)	Add missing CMake module includes
Externals/discord-rpc/CMakeLists.txt	CMake 4.x rejects version < 3.5	Update minimum to 3.5
Source/Core/DolphinQt/CMakeLists.txt	Missing Qt private header	Add Qt6::GuiPrivate dependency

Build

Note: -DUSE_SYSTEM_FMT=OFF is required on systems with fmt 12+. The fmt 12 release has breaking API changes (FMT_COMPILE_STRING → fmt::string_view conversion) that affect the Dolphin codebase. This is an upstream Dolphin issue, not Brawlback-specific. Using the bundled fmt 10.x is the intended solution.

cmake -DUSE_SYSTEM_FMT=OFF ..  # system fmt 12 has breaking changes
cmake --build . -j$(nproc)

Result

All targets build successfully:
- dolphin-emu (Qt GUI)
- dolphin-emu-nogui
- dolphin-tool

[blasphemetheus]

The copilot explanation is:
The failing job (59505155561) fails due to the following error in the logs:

CMake Error at external/dav1d/CMakeLists.txt:97 (enable_language):
No CMAKE_ASM_NASM_COMPILER could be found.

This means the NASM assembler (Netwide Assembler) is missing. The build system needs it to compile assembly (ASM) sources for the vendored dav1d dependency.

Solution:
You must ensure NASM is installed in your build environment and available in the PATH before CMake is invoked. On Windows environments, NASM can be installed via Chocolatey:

choco install nasm

Or, download NASM from https://www.nasm.us/ and add its directory to your PATH.

GitHub Actions Workflow Fix:
If this is a Windows GitHub Actions runner, add a step before the CMake/build step in your .github/workflows/dolphin.yml:

- name: Install NASM
  run: choco install nasm -y

For Ubuntu/Linux runners:

- name: Install NASM
  run: sudo apt-get update && sudo apt-get install -y nasm

Summary:

• Install NASM (Netwide Assembler) in your CI environment.
• Ensure NASM is available in your system PATH before running CMake.

This will resolve the missing NASM compiler error blocking your build.

[blasphemetheus]

sorry closing this (read dev-general)