diff --git a/flightlib/CMakeLists.txt b/flightlib/CMakeLists.txt
index 213d25d..a3a2b75 100644
--- a/flightlib/CMakeLists.txt
+++ b/flightlib/CMakeLists.txt
@@ -154,8 +154,7 @@ else()
 endif()
 
 # Summarize Flags
-set(CMAKE_CXX_FLAGS_RELEASE
-	"${CMAKE_CXX_FLAGS_RELEASE} ${CMAKE_CXX_FAST_FLAGS} ${CMAKE_CXX_ARCH_FLAGS} ${CMAKE_CXX_PAR_FLAGS}")
+set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${CMAKE_CXX_FAST_FLAGS} ${CMAKE_CXX_ARCH_FLAGS} ${CMAKE_CXX_PAR_FLAGS}")
 string(REPLACE "-DNDEBUG" "" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
 message(STATUS "The activated CXX RELEASE configuration is:\n ${CMAKE_CXX_FLAGS_RELEASE}")
 message(STATUS "The activated CXX DEBUG configuration is:\n ${CMAKE_CXX_FLAGS_DEBUG}")
@@ -222,7 +221,7 @@ else()
 		${CUDA_curand_LIBRARY}
 		${CUDA_cublas_LIBRARY}
 		${CUDA_LIBRARIES}
-		${catkin_LIBRARIES} ${PCL_LIBRARIES} ${PROJECT_SOURCE_DIR}
+		${catkin_LIBRARIES}
 		yaml-cpp
 		zmq
 		zmqpp
@@ -317,4 +316,4 @@ target_link_libraries(map_visual_node
 	${catkin_LIBRARIES}
 )
 
-message(STATUS "================  !Done. No more nightmare!  ================")
+message(STATUS "================  !Done. You can build the project now!  ================")
diff --git a/flightlib/cmake/eigen.cmake b/flightlib/cmake/eigen.cmake
index e17cb3e..dd401e8 100644
--- a/flightlib/cmake/eigen.cmake
+++ b/flightlib/cmake/eigen.cmake
@@ -1,5 +1,6 @@
 # Download and unpack eigen at configure time
 message(STATUS "Getting Eigen...")
+message(STATUS "** NOTE ** If there's an issue connecting to GitHub, add a proxy to the download link in file flightlib/cmake/eigen_download.cmake.")
 
 configure_file(
   cmake/eigen_download.cmake
diff --git a/flightlib/cmake/gtest.cmake b/flightlib/cmake/gtest.cmake
index 98ee7bc..1a78fca 100644
--- a/flightlib/cmake/gtest.cmake
+++ b/flightlib/cmake/gtest.cmake
@@ -1,5 +1,6 @@
 # Download and unpack googletest at configure time
 message(STATUS "Getting gtests...")
+message(STATUS "** NOTE ** If there's an issue connecting to GitHub, add a proxy to the download link in file flightlib/cmake/gtest_download.cmake.")
 
 configure_file(cmake/gtest_download.cmake ${PROJECT_SOURCE_DIR}/externals/googletest-download/CMakeLists.txt)
 execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
diff --git a/flightlib/cmake/pybind11.cmake b/flightlib/cmake/pybind11.cmake
index f4c56cd..435d27b 100644
--- a/flightlib/cmake/pybind11.cmake
+++ b/flightlib/cmake/pybind11.cmake
@@ -1,5 +1,6 @@
 # Download and unpack pybind11 at configure time
 message(STATUS "Getting Pybind11...")
+message(STATUS "** NOTE ** If there's an issue connecting to GitHub, add a proxy to the download link in file flightlib/cmake/pybind11_download.cmake.")
 
 # set(PYBIND11_PYTHON_VERSION 3.6)
 set(PYBIND11_PYTHON_VERSION ${PYTHON_VERSION_STRING})   
diff --git a/flightlib/cmake/pybind11_download.cmake b/flightlib/cmake/pybind11_download.cmake
index d81e578..0744f1e 100644
--- a/flightlib/cmake/pybind11_download.cmake
+++ b/flightlib/cmake/pybind11_download.cmake
@@ -4,7 +4,7 @@ project(pybind11-download)
 
 include(ExternalProject)
 ExternalProject_Add(pybind11
-  GIT_REPOSITORY    https://cf.ghproxy.cc/https://github.com/pybind/pybind11
+  GIT_REPOSITORY    https://github.com/pybind/pybind11
   GIT_TAG           master 
   SOURCE_DIR        "${PROJECT_SOURCE_DIR}/externals/pybind11-src"
   BINARY_DIR        "${PROJECT_SOURCE_DIR}/externals/pybind11-bin"
diff --git a/flightlib/cmake/yaml.cmake b/flightlib/cmake/yaml.cmake
index 8d1fdea..3785d9c 100644
--- a/flightlib/cmake/yaml.cmake
+++ b/flightlib/cmake/yaml.cmake
@@ -1,5 +1,6 @@
 # Download and unpack eigen at configure time
 message(STATUS "Getting yaml-cpp...")
+message(STATUS "** NOTE ** If there's an issue connecting to GitHub, add a proxy to the download link in file flightlib/cmake/yaml_download.cmake.")
 
 configure_file(
   cmake/yaml_download.cmake
diff --git a/flightlib/cmake/yaml_download.cmake b/flightlib/cmake/yaml_download.cmake
index 8e75664..793cb13 100644
--- a/flightlib/cmake/yaml_download.cmake
+++ b/flightlib/cmake/yaml_download.cmake
@@ -4,7 +4,7 @@ project(yaml-download)
 
 include(ExternalProject)
 ExternalProject_Add(yaml
-  GIT_REPOSITORY    https://cf.ghproxy.cc/https://github.com/jbeder/yaml-cpp
+  GIT_REPOSITORY    https://github.com/jbeder/yaml-cpp
   GIT_TAG           master
   SOURCE_DIR        "${PROJECT_SOURCE_DIR}/externals/yaml-src"
   BINARY_DIR        "${PROJECT_SOURCE_DIR}/externals/yaml-bin"