when attempting to recompile the plugin during loading of the project i'm getting an error message

[98/220] Compile PyHUD.gen.cpp 1 error generated. In file included from /vol/dev/src/sebastian/UnrealEngine/testProj01/Plugins/UnrealEnginePython/Intermediate/Build/Linux/B4D820EA/UE4Editor/Inc/UnrealEnginePython/PyNativeWidgetHost.gen.cpp:8: In file included from /vol/dev/src/sebastian/UnrealEngine/testProj01/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Public/PyNativeWidgetHost.h:6: In file included from /vol/dev/src/sebastian/UnrealEngine/testProj01/Plugins/UnrealEnginePython/Source/UnrealEnginePython/Public/UnrealEnginePython.h:22: In file included from /usr/include/python2.7/Python.h:8: /usr/include/python2.7/pyconfig.h:3:12: fatal error: 'x86_64-linux-gnu/python2.7/pyconfig.h' file not found # include <x86_64-linux-gnu/python2.7/pyconfig.h>

the directory/file in that the pyconfig.h is pointing to exists

/usr/include/x86_64-linux-gnu/python2.7/pyconfig.h

i'm wondering if there is an include-directory missing somewhere ?
... using:

• current 'master' - branch
• UE4.20
• Ubuntu16.04

thanks for your help!