I'm sorry, I'm very incompetent on code and environment variables. I can't compile Cuda. I have made these attempts: 1) Copied attachment.obj into ~/cinelerra5/cinelerra-5.1/ and given the command "env CUDA_PATH=/opt/cuda" (setenv does not exist in Arch). The result of "./configure ..." is: ... checking for /usr/local/cuda/include/cuda.h... no checking cuda sdk... no configure: error: required for CUDA support. (note that somewhere it still looks for /usr/local/cuda instead of /opt/cuda) 2) I deleted "plugin_cuda" and renamed "attchment.obj" to "plugin_cuda". But the resulting error is exactly the same. 3) I tried to edit the file "plugin_cuda" replacing all instances "/usr/local/cuda" with "/opt/cuda", but the result is always the same error.