# Missing sensor-imu

Source: https://forum.modalai.com/topic/124/missing-sensor-imu
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2021-02-03 19:08:54 UTC by ray tsou
Replies: 3 · Views: 906

## ray tsou · 2021-02-03 19:08:54 UTC

Hello,

I was testing out how to build ros nodes within voxl-emulator and following instructions from the README on this page:
https://gitlab.com/voxl-public/ros/voxl-nodes

When running `./build.sh`, the compilation fails with `fatal error: sensor-imu/sensor_imu_api.h: No such file or directory`. I am using voxl-emulator v1.4. How can I obtain the package?

## Reply by Chad Sweet (ModalAI staff) · 2021-02-04 06:04:53 UTC

I can repeat this error, will look into it. Thanks for reporting.

## Reply by Chad Sweet (ModalAI staff) · 2021-02-04 18:04:27 UTC

As a workaround, can you please try this? 

1. In voxl-emulator, edit /etc/opkg/opkg.conf and add the following line to the end of the file: "src/gz stable http://voxl-packages.modalai.com/stable".
2. Then run: sudo opkg update
3. Then run: sudo opkg install imu_app
4. Finally: ./build.sh

It seems there is some incompatibility with our v1.4 emulator that needs to be fixed

## Reply by ray tsou · 2021-02-05 18:04:34 UTC (in reply to Chad Sweet)

@Chad-Sweet 
This works, thanks. When will this be fixed?