最近在学slam，配环境属实令人头大，每个库安装半天，最后十四讲例程一看还是不能跑，不知道是库没安好还是因为版本不一致或者makefile没写好。
所以最近安装后在找例程，先试试每个库是不是安装成功了。
安装前面有：ubuntu16.04安装Pangolin库_浅梦语11的博客-CSDN博客
验证用的是Pangolin自带的例程：Pangolin/examples/HelloPangolin文件夹
1.终端进入对应文件夹：
cd Pangolin
cd examples/HelloPangolin
2.编译运行一条龙：
cmake .
make
./HelloPangolin
当然，这是理想情况。如果make环节遇到报错：
/usr/local/include/pangolin/var/varextra.h:68:52: required from here
/usr/local/include/pangolin/var/varvalue.h:100:23: error: ‘class pangolin::VarValue<bool>’ has no member named ‘str’
this->str = (VarValueT<std::string>*)this;
^
/usr/local/include/pangolin/var/varvalue.h:103:23: error: ‘class pangolin::VarValue<bool>’ has no member named ‘str’
this->str = str_ptr;
^
CMakeFiles/HelloPangolin.dir/build.make:75: recipe for target 'CMakeFiles/HelloPangolin.dir/main.o' failed
make[2]: *** [CMakeFiles/HelloPangolin.dir/main.o] Error 1
CMakeFiles/Makefile2:82: recipe for target 'CMakeFiles/HelloPangolin.dir/all' failed
make[1]: *** [CMakeFiles/HelloPangolin.dir/all] Error 2
Makefile:90: recipe for target 'all' failed
make: *** [all] Error 2
这是CMakeLists.txt出问题了，主要是标准支持等问题，需要加上：
# Check C++11 or C++0x support
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
if(COMPILER_SUPPORTS_CXX11)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
add_definitions(-DCOMPILEDWITHC11)
message(STATUS "Using flag -std=c++11.")
elseif(COMPILER_SUPPORTS_CXX0X)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
add_definitions(-DCOMPILEDWITHC0X)
message(STATUS "Using flag -std=c++0x.")
else()
message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
endif()最后整个CMakeLists.txt应该是：
# Find Pangolin (https://github.com/stevenlovegrove/Pangolin)
find_package(Pangolin 0.4 REQUIRED)
include_directories(${Pangolin_INCLUDE_DIRS})
add_executable(HelloPangolin main.cpp)
target_link_libraries(HelloPangolin ${Pangolin_LIBRARIES})
# Check C++11 or C++0x support
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
if(COMPILER_SUPPORTS_CXX11)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
add_definitions(-DCOMPILEDWITHC11)
message(STATUS "Using flag -std=c++11.")
elseif(COMPILER_SUPPORTS_CXX0X)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
add_definitions(-DCOMPILEDWITHC0X)
message(STATUS "Using flag -std=c++0x.")
else()
message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
endif()很多解决是单纯改set (CMAKE_CXX_STANDARD 11)，但是一直不行，这个复杂点但是可以，不行就试试这个吧。
结果为：
