RTC always treats the working directory as an include path.

src/flamegpu/util/detail/JitifyCache.cu

@@ -14,6 +14,7 @@
 #include <filesystem>
 using std::tr2::sys::temp_directory_path;
 using std::tr2::sys::exists;
+using std::tr2::sys::current_path;
 using std::tr2::sys::path;
 using std::tr2::sys::directory_iterator;
 #else
@@ -22,6 +23,7 @@ using std::tr2::sys::directory_iterator;
 #include <experimental/filesystem>
 using std::experimental::filesystem::v1::temp_directory_path;
 using std::experimental::filesystem::v1::exists;
+using std::experimental::filesystem::v1::current_path;
 using std::experimental::filesystem::v1::path;
 using std::experimental::filesystem::v1::directory_iterator;
 #endif
@@ -272,6 +274,9 @@ std::unique_ptr<KernelInstantiation> JitifyCache::compileKernel(const std::strin
     // cuda include directory (via CUDA_PATH)
     options.push_back(std::string("-I" + cuda_include_dir));
 
+    // Add working directory as include path
+    options.push_back(std::string("-I" + current_path().generic_string()));
+
 #ifdef USE_GLM
     // GLM headers increase build time ~5x, so only enable glm if user is using it
     if (kernel_src.find("glm") != std::string::npos) {