diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7fdffe3..a185fdc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,16 @@ set(LBUG_SOURCE_DIR "" CACHE PATH "Path to the Ladybug source tree used for stan
 set(LBUG_BUILD_DIR "" CACHE PATH "Path to the Ladybug build tree used for standalone Node.js builds")
 set(LBUG_NODEJS_EXTRA_LINK_LIBS "" CACHE STRING "Additional link libraries for standalone Node.js builds against a precompiled liblbug")
 
+function(lbug_nodejs_set_default_dir out_var suffix)
+  foreach(base_dir IN ITEMS "${LBUG_SOURCE_DIR}" "${CMAKE_SOURCE_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}/../.." "${CMAKE_CURRENT_SOURCE_DIR}/../ladybug")
+    if(base_dir AND EXISTS "${base_dir}/${suffix}")
+      set(${out_var} "${base_dir}/${suffix}" PARENT_SCOPE)
+      return()
+    endif()
+  endforeach()
+  set(${out_var} "" PARENT_SCOPE)
+endfunction()
+
 # If on Windows use npx.cmd instead of npx
 if(WIN32)
   set(NPX_CMD npx.cmd)
@@ -115,15 +125,25 @@ if(NOT TARGET lbug)
     message(FATAL_ERROR "Precompiled liblbug archive not found: ${LBUG_NODEJS_PRECOMPILED_LIB_PATH}")
   endif()
 
-  set(LBUG_NODEJS_SOURCE_INCLUDE_DIR "${PROJECT_SOURCE_DIR}/src/include")
-  set(LBUG_NODEJS_BUILD_INCLUDE_DIR "${PROJECT_BINARY_DIR}/src/include")
-  if(LBUG_SOURCE_DIR)
-    set(LBUG_NODEJS_SOURCE_INCLUDE_DIR "${LBUG_SOURCE_DIR}/src/include")
-  endif()
-  if(LBUG_BUILD_DIR)
+  lbug_nodejs_set_default_dir(LBUG_NODEJS_SOURCE_INCLUDE_DIR "src/include")
+  set(LBUG_NODEJS_BUILD_INCLUDE_DIR "")
+  if(LBUG_BUILD_DIR AND EXISTS "${LBUG_BUILD_DIR}/src/include")
     set(LBUG_NODEJS_BUILD_INCLUDE_DIR "${LBUG_BUILD_DIR}/src/include")
-  elseif(LBUG_SOURCE_DIR)
+  elseif(LBUG_SOURCE_DIR AND EXISTS "${LBUG_SOURCE_DIR}/build/release/src/include")
     set(LBUG_NODEJS_BUILD_INCLUDE_DIR "${LBUG_SOURCE_DIR}/build/release/src/include")
+  elseif(EXISTS "${CMAKE_BINARY_DIR}/src/include")
+    set(LBUG_NODEJS_BUILD_INCLUDE_DIR "${CMAKE_BINARY_DIR}/src/include")
+  elseif(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/../../build/release/src/include")
+    set(LBUG_NODEJS_BUILD_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../build/release/src/include")
+  elseif(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/../ladybug/build/release/src/include")
+    set(LBUG_NODEJS_BUILD_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../ladybug/build/release/src/include")
+  endif()
+
+  if(NOT LBUG_NODEJS_SOURCE_INCLUDE_DIR)
+    message(FATAL_ERROR "Could not determine the Ladybug source include directory. Set LBUG_SOURCE_DIR to a Ladybug checkout.")
+  endif()
+  if(NOT LBUG_NODEJS_BUILD_INCLUDE_DIR)
+    message(FATAL_ERROR "Could not determine the Ladybug build include directory. Set LBUG_BUILD_DIR or LBUG_SOURCE_DIR to a built Ladybug tree.")
   endif()
 
   add_library(lbug STATIC IMPORTED GLOBAL)