fatal error: THC/THC.h: No such file or directory

[archenroot]

I am on Gentoo GCC 6.2.0 r1 with dev-util/nvidia-cuda-toolkit-8.0.44.

While trying to run Gentoo ebuild for torch-cunn master branch I experience:
lib/THCUNN/CMakeFiles/THCUNN.dir/build.make:84: recipe for target 'lib/THCUNN/CMakeFiles/THCUNN.dir/THCUNN_generated_BatchNormalization.cu.o' failed make[2]: *** [lib/THCUNN/CMakeFiles/THCUNN.dir/THCUNN_generated_BatchNormalization.cu.o] Error 1 In file included from /tmp/portage/sci-libs/torch-cunn-9999/work/torch-cunn-9999/lib/THCUNN/VolumetricReplicationPadding.cu:1:0: /tmp/portage/sci-libs/torch-cunn-9999/work/torch-cunn-9999/lib/THCUNN/THCUNN.h:1:21: fatal error: THC/THC.h: No such file or directory #include <THC/THC.h> ^ compilation terminated.

It could be potentially issue with my ebuild package file while not getting all dependencies in place. What is this THC.h file?

Thanks.

[archenroot]

Ahh, I realized I will need first CUTORCH installed where this file is included.. just trying out...