[MinGW64 on Win11]Failed to build OpenCV-Python-headless via pip install

UltraBlackCat
Thu, 30 Oct 2025 14:32:18 +0000
Python

Mingw64 on Windows11

Python 3.12.12 [GCC 15.2.0 64 bit (AMD64)] on win32

MSYS2 Package ,mingw-w64-x86_64-python-opencv goes very well with no trouble,

However, I was encountered one issue: the import process takes an very long time.

First time import takes over 60 seconds…especially on newer PC (Core Ultra)

So I decided to build “headless version“ as light module

Following is the procedure.

(1)Remove MSYS2 packages for opencv-python

pacman -R mingw-w64-x86_64-python-opencv

(2)Switching venv(named venv-trw)

source venv-trw/bin/activate

(3)Pip Install

pip install opencv-python-headless

#Failed#

(Log with Error Message)

Installing build dependencies … done

Getting requirements to build wheel … done

Installing backend dependencies … done

Preparing metadata (pyproject.toml) … -

Building wheels for collected packages: opencv-python-headless, numpy

Building wheel for opencv-python-headless (pyproject.toml) … error

error: subprocess-exited-with-error

× Building wheel for opencv-python-headless (pyproject.toml) did not run successfully.

│ exit code: 1

╰─> [525 lines of output]

--------------------------------------------------------------------------------

-- Trying ‘Ninja (Visual Studio 17 2022 x64 v144)’ generator

--------------------------------

---------------------------

----------------------

-----------------

------------

-------

--

Not searching for unused variables given on the command line.

CMake Deprecation Warning at CMakeLists.txt:1 (cmake_minimum_required):

Compatibility with CMake < 3.10 will be removed from a future version of

CMake.

Update the VERSION argument value. Or, use the … syntax

to tell CMake that the project requires at least but has been updated

to work with policies introduced by or earlier.

CMake Error at CMakeLists.txt:2 (PROJECT):

Generator

Ninja

does not support platform specification, but platform

x64 was specified.

-- Configuring incomplete, errors occurred!

(Repeated)

“Why not Mingw64 but Visual Studio(Windows)?”

I have tried various methods to resolve this error, but none of them were effective.

specifying pydistutils.cfg

[build]

compiler=mingw32

[build_ext]

compiler=mingw32

(4)Build from Source and pip wheel

Next, I attempted to manually build the source code within the MinGW64 environment,

and I‘m currently stuck at the final build with ninja.

(i)Get Sourcecode from Github

git clone --recursive https://github.com/opencv/opencv-python.git

(ii)Setting Option as Env

export ENABLE_HEADLESS=1 #Headless version

export CMAKE_ARGS=“-DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++”

#Use Mingw64 build tools

(iii)Build it via pip wheel(mingw64) :FAILED

cd ~/opencv-python

pip wheel . —verbose

…

(Error Message

“Ninja does not support platform specification, but platform

x64 was specified.” )

←-I’m quite stuck now.

Any suggestions would be greatly appreciated.

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