LOCALBASE searched before macOS framework with CMake on Darwin

[triaxx%NetBSD.org@localhost]

Hi,

If graphics/MesaLib is *not* installed:

    % ~/pkg/sbin/pkg_info | grep MesaLib

I understand that Cmake finds the OpenGL framework provided by macOS:

    % grep "OPENGL_gl_LIBRARY:" 
work/openttd-14.0/cmake-pkgsrc-build/CMakeCache.txt

OPENGL_gl_LIBRARY:FILEPATH=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.2.sdk/System/Library/Frameworks/OpenGL.framework

But if graphics/MesaLib is installed (but its buildlink3.mk is not the 
Makefile):

    % ~/pkg/sbin/pkg_info | grep MesaLib
    MesaLib-21.3.9nb4   Open source OpenGL implementation

Now Cmake finds the OpenGL implementation provided by pkgsrc:

    % grep "OPENGL_gl_LIBRARY:" 
work/openttd-14.0/cmake-pkgsrc-build/CMakeCache.txt
    OPENGL_gl_LIBRARY:FILEPATH=/Users/triaxx/pkg/lib/libGL.dylib

And the build step fails with the following error message:

    ld: library 'GL' not found
    clang: error: linker command failed with exit code 1 (use -v to see 
invocation)

What is the right way to avoid CMake finding OpenGL path in LOCALBASE first?