I get lots of errors like these:

--8<---------------cut here---------------start------------->8---
interfaces/coin_header_includes.h:662: Error: Unable to find 'Inventor/VRMLnodes/SoVRMLViewpoint.h'
interfaces/coin_header_includes.h:663: Error: Unable to find 'Inventor/VRMLnodes/SoVRMLVisibilitySensor.h'
interfaces/coin_header_includes.h:664: Error: Unable to find 'Inventor/VRMLnodes/SoVRMLWorldInfo.h'
/gnu/store/ivbbmgrvhdc46p2ywx1x2zsmal3x0z5n-soqt-1.6.0-1.fb8f655/include/Inventor/Qt/devices/SoQtDevice.h:66: Error: Unable to find 'Inventor/SbLinear.h'
/gnu/store/ivbbmgrvhdc46p2ywx1x2zsmal3x0z5n-soqt-1.6.0-1.fb8f655/include/Inventor/Qt/SoQtObject.h:40: Error: Unable to find 'Inventor/SbBasic.h'
--8<---------------cut here---------------end--------------->8---


-- 
Ricardo