Orb_slam2: Fail to compile ORB-SLAM2

[balzar29]

Hi, this is the error:

make[2]: *** [CMakeFiles/ORB_SLAM2.dir/build.make:495: CMakeFiles/ORB_SLAM2.dir/src/Viewer.cc.o] Error 1 make[2]: *** [CMakeFiles/ORB_SLAM2.dir/build.make:63: CMakeFiles/ORB_SLAM2.dir/src/System.cc.o] Error 1 make[1]: *** [CMakeFiles/Makefile2:253: CMakeFiles/ORB_SLAM2.dir/all] Error 2 make: *** [Makefile:84: all] Error 2
I'm on ArchLinux not Ubuntu, maybe this could be the problem, but i've installed all the dependences.

[EugeneLew]

I could be wrong, but I think there should be something else indicating the exact error, before these lines. Try running the make command with make -j1 and see before you can get the error before these lines.

[balzar29]

thanks for answer! I found something like this:

`/home/io/Programmi/ORB_SLAM2-master/src/System.cc: In member function ‘cv::Mat ORB_SLAM2::System::TrackStereo(const cv::Mat&, const cv::Mat&, const double&)’:
/home/io/Programmi/ORB_SLAM2-master/src/System.cc:134:17: error: ‘usleep’ was not declared in this scope
usleep(1000);
^~

/home/io/Programmi/ORB_SLAM2-master/src/System.cc:134:17: note: suggested alternative: ‘fseek’
usleep(1000);
^~
fseek

/home/io/Programmi/ORB_SLAM2-master/src/System.cc: In member function ‘cv::Mat ORB_SLAM2::System::TrackRGBD(const cv::Mat&, const cv::Mat&, const double&)’:
/home/io/Programmi/ORB_SLAM2-master/src/System.cc:185:17: error: ‘usleep’ was not declared in this scope
usleep(1000);
^~

/home/io/Programmi/ORB_SLAM2-master/src/System.cc:185:17: note: suggested alternative: ‘fseek’
usleep(1000);
^~
fseek

/home/io/Programmi/ORB_SLAM2-master/src/System.cc: In member function ‘cv::Mat ORB_SLAM2::System::TrackMonocular(const cv::Mat&, const double&)’:
/home/io/Programmi/ORB_SLAM2-master/src/System.cc:236:17: error: ‘usleep’ was not declared in this scope
usleep(1000);
^~

/home/io/Programmi/ORB_SLAM2-master/src/System.cc:236:17: note: suggested alternative: ‘fseek’
usleep(1000);
^~
fseek

/home/io/Programmi/ORB_SLAM2-master/src/System.cc: In member function ‘void ORB_SLAM2::System::Shutdown()’:
/home/io/Programmi/ORB_SLAM2-master/src/System.cc:309:13: error: ‘usleep’ was not declared in this scope
usleep(5000);
^~

/home/io/Programmi/ORB_SLAM2-master/src/System.cc:309:13: note: suggested alternative: ‘fseek’
usleep(5000);
^~
fseek

/home/io/Programmi/ORB_SLAM2-master/src/System.cc:315:9: error: ‘usleep’ was not declared in this scope
usleep(5000);
^~
/home/io/Programmi/ORB_SLAM2-master/src/System.cc:315:9: note: suggested alternative: ‘fseek’
usleep(5000);
^~
fseek
`

[Santi-7]

See #144

You have to include <unistd.h>. This PR includes it in several files. You can just include it in System.h.

[siddu1998]

this is due to the sleep function, choices you have to solve this is
a. add #include in all those files where usleep error pops up
b. Navigate to the System.h folder and add #include