# RTL dongle not working with GRC 3.7.4 updated

**URL:** <https://www.ruby-forum.com/t/rtl-dongle-not-working-with-grc-3-7-4-updated/230121>\
**Category:** GNU Radio\
**Created:** [June 1, 2014, 2:02am UTC](https://www.ruby-forum.com/t/rtl-dongle-not-working-with-grc-3-7-4-updated/230121 "2014-06-01T02:02:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [June 1, 2014, 2:02am UTC](https://www.ruby-forum.com/t/rtl-dongle-not-working-with-grc-3-7-4-updated/230121/1 "2014-06-01T02:02:41Z")

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Since updating GRC3.7.3 to GRC3.7.4, I am unable to run my RTL dongle  
flow graphs. Attached is the error message that I receive. The flow  
graph worked perfectly with GRC3.7.3.  
Regards,  
John Petrich

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**Author:** ![johnpetterson](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/41988e/32.png) [@johnpetterson](https://www.ruby-forum.com/u/johnpetterson)\
**Post date:** [June 1, 2014, 2:07am UTC](https://www.ruby-forum.com/t/rtl-dongle-not-working-with-grc-3-7-4-updated/230121/2 "2014-06-01T02:07:16Z")

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I apologize. The correct error message is attached. The previous  
attachment is not the correct error message.  
Regards,  
John Petrich

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**Author:** ![johnpetterson](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/41988e/32.png) [@johnpetterson](https://www.ruby-forum.com/u/johnpetterson)\
**Post date:** [June 3, 2014, 6:21am UTC](https://www.ruby-forum.com/t/rtl-dongle-not-working-with-grc-3-7-4-updated/230121/3 "2014-06-03T06:21:49Z")

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The RTL dongle issue with GRC3.7.4 was easily resolved by removing  
GRC3.7.4 and building GRC3.7.4 using the script and the " -m" command.

I erroneously assumed that a git update would take care of updating all  
of the libraries, such as the RTL library. Not so. A simple solution  
for me was to build GRC3.7.4 from the main branch. The RTL dongle flows  
now work perfectly as they always have.

Regards,  
John Petrich