Update CMakeLists.txt to be more flexible (#3354)

CMakeLists.txt

@@ -38,6 +38,12 @@ tvm_option(USE_RTTI "Build with RTTI" ON)
 tvm_option(USE_MSVC_MT "Build with MT" OFF)
 tvm_option(INSTALL_DEV "Install compiler infrastructure" OFF)
 
+# 3rdparty libraries
+tvm_option(DLPACK_PATH "Path to DLPACK" "3rdparty/dlpack/include")
+tvm_option(DMLC_PATH "Path to DMLC" "3rdparty/dmlc-core/include")
+tvm_option(RANG_PATH "Path to RANG" "3rdparty/rang/include")
+tvm_option(COMPILER_RT_PATH "Path to COMPILER-RT" "3rdparty/compiler-rt")
+
 # Contrib library options
 tvm_option(USE_BLAS "The blas library to be linked" none)
 tvm_option(USE_MKL_PATH "MKL root path when use MKL blas" none)
@@ -51,11 +57,12 @@ tvm_option(USE_RANDOM "Build with random support" OFF)
 tvm_option(USE_ANTLR "Build with ANTLR for Relay parsing" OFF)
 
 # include directories
+include_directories(${CMAKE_INCLUDE_PATH})
 include_directories("include")
-include_directories("3rdparty/dlpack/include")
-include_directories("3rdparty/dmlc-core/include")
-include_directories("3rdparty/rang/include")
-include_directories("3rdparty/compiler-rt")
+include_directories(${DLPACK_PATH})
+include_directories(${DMLC_PATH})
+include_directories(${RANG_PATH})
+include_directories(${COMPILER_RT_PATH})
 
 # initial variables
 set(TVM_LINKER_LIBS "")