Remarks / bugs after compiling en building latest 2.7.0 for Windows 10

After compiling and building Darktable 2.7.0 for windows 10 I get the folowing remarks of the system. Darktable runs but OPENCL can not be activated.

remarks of system in MINGW64:

$ /opt/darktable/bin/darktable.exe

[dt_pthread_create] info: bumping pthread’s stacksize from 0 to 262144

[dt_pthread_create] info: bumping pthread’s stacksize from 0 to 262144

[dt_pthread_create] info: bumping pthread’s stacksize from 0 to 262144

[dt_pthread_create] info: bumping pthread’s stacksize from 0 to 262144

[dt_pthread_create] info: bumping pthread’s stacksize from 0 to 262144

[dt_pthread_create] info: bumping pthread’s stacksize from 0 to 262144

[dt_pthread_create] info: bumping pthread’s stacksize from 0 to 262144

[dt_pthread_create] info: bumping pthread’s stacksize from 0 to 262144

[dt_pthread_create] info: bumping pthread’s stacksize from 0 to 262144

[dt_pthread_create] info: bumping pthread’s stacksize from 0 to 262144

[dt_pthread_create] info: bumping pthread’s stacksize from 0 to 262144

[dt_pthread_create] info: bumping pthread’s stacksize from 0 to 262144

warning: can’t load darktable logo from SVG file `C:\msys64\opt\darktable\share\darktable\pixmaps\idbutton.svg’

Operation not supported

(darktable.exe:7296): Pango-WARNING **: 17:11:46.091: couldn’t load font “sans-serif Condensed Not-Rotated 9.71875”, falling back to “Sans Condensed Not-Rotated 9.71875”, expect ugly output.

(darktable.exe:7296): Pango-WARNING **: 17:11:46.091: couldn’t load font “Sans Condensed Not-Rotated 9.71875”, falling back to “Sans Not-Rotated 9.71875”, expect ugly output.

(darktable.exe:7296): Pango-WARNING **: 17:11:59.304: couldn’t load font “sans-serif Condensed Not-Rotated 8.099609375”, falling back to “Sans Condensed Not-Rotated 8.099609375”, expect ugly output.

(darktable.exe:7296): Pango-WARNING **: 17:11:59.304: couldn’t load font “Sans Condensed Not-Rotated 8.099609375”, falling back to “Sans Not-Rotated 8.099609375”, expect ugly output.

Can sombody help me to solve this bugs?
Many Thanks upfront.