event.h:即使安装了libevent-dev，也没有这样的文件或目录

Question

我正试图编译一个依赖于libevent的库。该库是使用cmake构建系统的更大项目的一部分，该系统具有顶级CMakeLists.txt文件。

库目录中的CMakelists.txt文件包含

target_include_directories(<library name> PRIVATE ${CMAKE_CURRENT_SOURCE_DIR} ${SOME_DEP_DIR}/include)
target_link_libraries(<library name> PUBLIC event)

libevent似乎出现在系统上-

$ ldconfig -p | grep event
libtevent.so.0 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libtevent.so.0
libtevent-util.so.0 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libtevent-util.so.0
libevent_pthreads-2.1.so.6 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libevent_pthreads-2.1.so.6
libevent_openssl-2.1.so.6 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libevent_openssl-2.1.so.6
libevent_extra-2.1.so.6 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libevent_extra-2.1.so.6
libevent_core-2.1.so.6 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libevent_core-2.1.so.6
libevent-2.1.so.6 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libevent-2.1.so.6

event.h 也是如此

$ ls -l /usr/include/event.h 
-rw-r--r-- 1 root root 2744 Feb  5  2018 /usr/include/event.h

我还安装了libevent-dev-

$ dpkg -l | grep libevent-dev
ii  libevent-dev                               2.1.8-stable-4build1                         amd64        Asynchronous event notification library (development files)

我不知道为什么当我运行make library时，我会得到以下错误-

fatal error: event.h: No such file or directory
#include <event.h>

任何建议都会很有帮助。谢谢

Answer 1

您需要将路径/usr/include添加到include目录列表中。

target_include_directories(<library name> PRIVATE /usr/include ${CMAKE_CURRENT_SOURCE_DIR} ${SOME_DEP_DIR}/include)

UPDATE：更好的方法是使用cmake的pkg配置模块来查找提供pkg配置的.pc文件的库。

# Add pkg-config functionality
find_package(PkgConfig REQUIRED) 
# search for libevent.pc
pkg_search_module(EVENT REQUIRED libevent)
target_include_directories(<library name> PRIVATE ${EVENT_INCLUDE_DIRS} ${CMAKE_CURRENT_SOURCE_DIR} ${SOME_DEP_DIR}/include)
target_link_libraries(<library name> PUBLIC ${EVENT_LIBRARIES})

libevent.pc包含成功链接库libevent所需的所有必要信息。