Can't Build: Irrlicht found, but it is not IrrlichtMt

[AntumDeluge]

Trying to build current master branch on Windows 10 64-bit.

I've downloaded the 64-bit Minetest Irrlicht libs for Windows, but CMake is complaining that it is the wrong version:

$ cmake ../ -G "MSYS Makefiles" -DRUN_IN_PLACE=TRUE -DIRRLICHT_DLL=../../irrlicht_libs/bin/IrrlichtMt.dll \
    -DIRRLICHT_INCLUDE_DIR=../../irrlicht_libs/include -DIRRLICHT_LIBRARY=../../irrlicht_libs/lib/libIrrlichtMt.dll.a

-- *** Will build version 5.5.0-dev ***
-- Looking for IRRLICHT_VERSION_MT
-- Looking for IRRLICHT_VERSION_MT - not found
CMake Error at CMakeLists.txt:78 (message):
  Irrlicht found, but it is not IrrlichtMt (Minetest's Irrlicht fork).  The
  Minetest team has forked Irrlicht to make their own customizations.  It can
  be found here: https://github.com/minetest/irrlicht

  Building the client with upstream Irrlicht is no longer possible.


-- Configuring incomplete, errors occurred!

Edit: I just realized why probably, the Windows libs are built for Visual Studio? So, I will have to build the libs myself.

Edit: Compiled the libs myself, but get the same error.

-- The C compiler identification is GNU 10.1.0
-- The CXX compiler identification is GNU 10.1.0
-- Check for working C compiler: C:/Users/antum/Environment/MSYS2-x86_64/mingw64/bin/gcc.exe
-- Check for working C compiler: C:/Users/antum/Environment/MSYS2-x86_64/mingw64/bin/gcc.exe - works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: C:/Users/antum/Environment/MSYS2-x86_64/mingw64/bin/g++.exe
-- Check for working CXX compiler: C:/Users/antum/Environment/MSYS2-x86_64/mingw64/bin/g++.exe - works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- *** Will build version 5.5.0-dev ***
-- Found Irrlicht: C:/Users/antum/Development/Minetest/irrlicht_libs/lib/libIrrlichtMt.dll.a
-- Looking for IRRLICHT_VERSION_MT
-- Looking for IRRLICHT_VERSION_MT - not found
CMake Error at CMakeLists.txt:78 (message):
  Irrlicht found, but it is not IrrlichtMt (Minetest's Irrlicht fork).  The
  Minetest team has forked Irrlicht to make their own customizations.  It can
  be found here: https://github.com/minetest/irrlicht

  Building the client with upstream Irrlicht is no longer possible.


-- Configuring incomplete, errors occurred!

[sfan5]

You should have set the include dir to ../../irrlicht_libs/include/irrlichtmt, which is the folder that contains IrrCompileConfig.h.

The error message is misleading as it says Irrlicht was "found" when it actually wasn't (and thus the Irrlicht/IrrlichtMt distinction cannot be verified). I'll improve this.

I just realized why probably, the Windows libs are built for Visual Studio? So, I will have to build the libs myself.

The libraries are built for MinGW, but building yourself is a good idea either way.

[AntumDeluge]

Thank you @sfan5, that worked. Waiting for it to build now.

Edit: Build successful.