message("now using FindCAP-NG.cmake find libCAP-NG") FIND_PATH(CAP-NG_INCLUDE_DIR cap-ng.h /usr/local/include) FIND_LIBRARY(CAP-NG_LIBRARY libcap-ng.so /usr/lib/x86_64-linux-gnu/) message("lib dir: ${CAP-NG_LIBRARY} include files ${CAP-NG_INCLUDE_DIR}") if(CAP-NG_INCLUDE_DIR AND CAP-NG_LIBRARY) set(CAP-NG_FOUND TRUE) endif(CAP-NG_INCLUDE_DIR AND CAP-NG_LIBRARY)改造一下，如果是centos系统那去/usr/lib64下找动态库，如果是其余系统则按之前的找

可以这样改造：

message("now using FindCAP-NG.cmake to find libCAP-NG")

if(CMAKE_SYSTEM_NAME STREQUAL "Linux" AND CMAKE_SYSTEM_VERSION MATCHES "centos")
  FIND_PATH(CAP-NG_INCLUDE_DIR cap-ng.h /usr/local/include)
  FIND_LIBRARY(CAP-NG_LIBRARY libcap-ng.so /usr/lib64/)
else()
  FIND_PATH(CAP-NG_INCLUDE_DIR cap-ng.h /usr/local/include)
  FIND_LIBRARY(CAP-NG_LIBRARY libcap-ng.so /usr/lib/x86_64-linux-gnu/)
endif()

message("lib dir: ${CAP-NG_LIBRARY} include files ${CAP-NG_INCLUDE_DIR}")

if(CAP-NG_INCLUDE_DIR AND CAP-NG_LIBRARY)
  set(CAP-NG_FOUND TRUE)
endif(CAP-NG_INCLUDE_DIR AND CAP-NG_LIBRARY)

这样，如果系统是 Linux 并且版本是 centos，就会去 `/usr/lib64` 下找动态库；否则就按照之前的方式去 `/usr/lib/x86_64-linux-gnu/` 下找动态库。