# Error when attempting to #include \ in a separate file other than main.c **URL:** \ **Category:** C++\ **Created:** [March 27, 2023, 3:41am UTC](https://community.stereolabs.com/t/error-when-attempting-to-include-sl-c-api-zed-interface-h-in-a-separate-file-other-than-main-c/2328 "2023-03-27T03:41:30Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![josefdmiller](https://community.stereolabs.com/letter_avatar_proxy/v4/letter/j/977dab/32.png) [@josefdmiller](https://community.stereolabs.com/u/josefdmiller)\ **Post date:** [March 27, 2023, 3:41am UTC](https://community.stereolabs.com/t/error-when-attempting-to-include-sl-c-api-zed-interface-h-in-a-separate-file-other-than-main-c/2328/1 "2023-03-27T03:41:31Z")
Greetings, I would like to break my code up into separate files however, when I attempt to compile with #include \ I get the following error. Is this an issue with the header guards or something? I’m using jetson nano and the most current sdk (3.8.2). Also this is the C API CMakeFiles/Control\_System.dir/mesh.c.o:(.rodata+0x0): multiple definition of `SL\_VIDEO\_SETTINGS\_VALUE\_AUTO’ CMakeFiles/Control\_System.dir/main.c.o:(.rodata+0x0): first defined here collect2: error: ld returned 1 exit status My CMakeLists.txt looks like this. All I have done is included my additional files in ADD\_EXECUTABLE and included the math library in target\_link\_libraries. CMAKE\_MINIMUM\_REQUIRED(VERSION 3.5) PROJECT(Control\_System) if(COMMAND cmake\_policy) cmake\_policy(SET CMP0003 OLD) cmake\_policy(SET CMP0015 OLD) endif(COMMAND cmake\_policy) SET(EXECUTABLE\_OUTPUT\_PATH “.”) find\_package(CUDA ${ZED\_CUDA\_VERSION} REQUIRED) include\_directories(${CUDA\_INCLUDE\_DIRS}) link\_directories(${CUDA\_LIBRARY\_DIRS}) if (WIN32) include\_directories($ENV{ZED\_SDK\_ROOT\_DIR}/include/) link\_directories($ENV{ZED\_SDK\_ROOT\_DIR}/lib/) else (WIN32) include\_directories(“/usr/local/zed/include/”) link\_directories(“/usr/local/zed/lib/”) endif(WIN32) ADD\_EXECUTABLE(${PROJECT\_NAME} main.c mesh.c mesh.h) target\_link\_libraries(${PROJECT\_NAME} sl\_zed\_c ${CUDA\_CUDA\_LIBRARY} ${CUDA\_CUDART\_LIBRARY} m) Thank you. ---
**Author:** ![BenjaminV](https://community.stereolabs.com/user_avatar/community.stereolabs.com/benjaminv/32/3863_2.png) [@BenjaminV](https://community.stereolabs.com/u/BenjaminV)\ **Post date:** [March 27, 2023, 7:54am UTC](https://community.stereolabs.com/t/error-when-attempting-to-include-sl-c-api-zed-interface-h-in-a-separate-file-other-than-main-c/2328/2 "2023-03-27T07:54:06Z")
Hi Josef, When you compiled the c wrapper, did you run `make install` ? This will copy the headers and libraries into the ZED folder (see : [https://www.stereolabs.com/docs/app-development/c/install/](https://www.stereolabs.com/docs/app-development/c/install/)). You can also take a look at our c tutorials to see what needs to be added in the CMakeLists ; [https://github.com/stereolabs/zed-examples/blob/master/tutorials/tutorial%201%20-%20hello%20ZED/c/CMakeLists.txt](https://github.com/stereolabs/zed-examples/blob/master/tutorials/tutorial%201%20-%20hello%20ZED/c/CMakeLists.txt). Best, Benjamin Vallon Stereolabs Support ---
**Author:** ![josefdmiller](https://community.stereolabs.com/letter_avatar_proxy/v4/letter/j/977dab/32.png) [@josefdmiller](https://community.stereolabs.com/u/josefdmiller)\ **Post date:** [March 27, 2023, 5:09pm UTC](https://community.stereolabs.com/t/error-when-attempting-to-include-sl-c-api-zed-interface-h-in-a-separate-file-other-than-main-c/2328/3 "2023-03-27T17:09:57Z")
Thank you for the reply, yes I did run make install, this is the location in my jetson. josef@jetson:/usr/local/zed/include/sl$ ls Camera.hpp c\_api josef@jetson:/usr/local/zed/include/sl$ cd c\_api/ josef@jetson:/usr/local/zed/include/sl/c\_api$ ls types\_c.h zed\_interface.h josef@jetson:/usr/local/zed/include/sl/c\_api$ pwd /usr/local/zed/include/sl/c\_api josef@jetson:/usr/local/zed/include/sl/c\_api$ Also this is my project layout. josef@jetson:~/Control\_System$ ls build CMakeLists.txt init.c init.h main.c mesh.c mesh.h state.c state.h As long as I only have the zed\_interface.h in main everything works fine. Its when I attempt to include it in another one of those files. For example I would like to wrap the init code into functions in the init.c file and call them from main. However it if I include it like this. #include \ #include “init.h” in my init.c file I get the error, multiple definition of `SL\_VIDEO\_SETTINGS\_VALUE\_AUTO’ I’m pretty sure that the correct #ifndef INIT\_H\_ #define INIT\_H\_ scheme would take care of stuff like that. I just don’t want to add it myself and break something 🙂 ---
**Author:** ![josefdmiller](https://community.stereolabs.com/letter_avatar_proxy/v4/letter/j/977dab/32.png) [@josefdmiller](https://community.stereolabs.com/u/josefdmiller)\ **Post date:** [March 28, 2023, 6:53am UTC](https://community.stereolabs.com/t/error-when-attempting-to-include-sl-c-api-zed-interface-h-in-a-separate-file-other-than-main-c/2328/4 "2023-03-28T06:53:21Z")
I think I solved it. After reading this post: [c - Multiple definition of const variables at header file - Stack Overflow](https://stackoverflow.com/questions/24216008/multiple-definition-of-const-variables-at-header-file) I added the static modifier to this const located in types\_c.h static const int SL\_VIDEO\_SETTINGS\_VALUE\_AUTO = -1; This solved the linker error, everything works fine now. I just have to figure out why this worked next. 🙂