    //.flag("-arch=sm_52")
    .flag("-prec-div=true")
    .flag("-prec-sqrt=true")
    .pic(true)
    .include("cuda_kernels")
    .include("/usr/local/cuda/include")
    .file("kernels/cast_kernels.cu")
    .file("kernels/reduce_kernels.cu")
    //.file("kernels/stats_kernels.cu")
    .file("kernels/special.cu")