[Boost Error] libcv_bridge.so：undefined reference to ‘boost::re_detail_106900::perl_matcher >, boost::regex_traits<char, boost::cpp_regex_traits > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits > > const&, ~

[Goal]

• cv_bridge와 연관되어 있는 Boost관련 에러를 해결할 수 있다.

---

[Reference Site]

[ https://github.com/monero-project/monero/issues/5449 ]

---

[Process]

• [Step 1] workspace로 가서 dependency인 boost 경로가 어디에 있는지 체크
  • `$ grep -i boost find build -name CMakeCache.txt`

build/cv_bridge/CMakeCache.txt:Boost_DIR:PATH=Boost_DIR-NOTFOUND
build/cv_bridge/CMakeCache.txt:Boost_INCLUDE_DIR:PATH=/usr/local/include
**build/cv_bridge/CMakeCache.txt:Boost_LIBRARY_DIR_DEBUG:PATH=/usr/lib/x86_64-linux-gnu**
**build/cv_bridge/CMakeCache.txt:Boost_LIBRARY_DIR_RELEASE:PATH=/usr/lib/x86_64-linux-gnu**

build/camera_model/CMakeCache.txt:Boost_DIR:PATH=Boost_DIR-NOTFOUND
build/camera_model/CMakeCache.txt:Boost_INCLUDE_DIR:PATH=/usr/local/include
**build/camera_model/CMakeCache.txt:Boost_LIBRARY_DIR_DEBUG:PATH=/usr/local/lib
build/camera_model/CMakeCache.txt:Boost_LIBRARY_DIR_RELEASE:PATH=/usr/local/lib**

• [Step 2] 저자의 경우 boost version이 2개가 동시에 설치가 되어 있기 때문에 사용하고자 하는 버전의 Boost absolute path를 export

export BOOST_INCLUDE_DIR="/usr/local/include"
export BOOST_LIBRARYDIR="/usr/local/lib"
export BOOST_ROOT="/usr/include/boost"

• [Step 3] `catkin clean` 후 다시 `catkin build` 진행
  • 추가로 이렇게 했는데도 변경된 버전으로 build되지 않은 경우 boost 버전 중 하나를 제거 !!!