Problem under OpenBSD

Alan Corey alancorey at
Tue Dec 11 03:34:55 UTC 2012

> From: keenerd <keenerd at>

> To: "osmocom-sdr at" <osmocom-sdr at>
> Cc: 
> Sent: Sunday, December 9, 2012 12:54 PM
> Subject: Re: Problem under OpenBSD
> On 12/9/12, Alan Corey <alancorey at> wrote:
>>  Under OpenBSD 5.0 I get:
>>  Linking C executable rtl_test
>>  /usr/bin/ld: cannot find -lrt
>>  collect2: ld returned 1 exit status
>>  gmake[2]: *** [src/rtl_test] Error 1
>>  gmake[1]: *** [src/CMakeFiles/rtl_test.dir/all] Error 2
>>  gmake: *** [all] Error 2
> On linux, librt provides a very high precision and usually fairly
> accurate timer.  This is used by rtl_test to make a rough PPM error
> measurement.
> I don't know about OpenBSD libraries.  We can either #ifdef in support
> for whatever high resolution timer OpenBSD provides (similar to the
> OSX specific code in rtl_test) or if no such timers are provided (such
> as on Windows) we could #ifdef the whole thing out.
> I'm guessing OpenBSD does not have these timers.
> -Kyle

I lucked out.  The timer functions you're using are all standard under OpenBSD without loading any libraries, so I just removed the -lrt and it compiles and seems to work.  I just got the dongle in the mail today so I haven't actually seen it work yet due to other screwups, but rtl_test and everything else seem to work.  It's a NooElec R820T, serial # 13 according to the eeprom.  Came from somebody selling through Amazon.   $19.95 with a remote and a magmount antenna.  Seems to have a protection diode.  Strange (MC?) antenna connector, gotta extend that out of the basement somehow.  Seems well made.

Found 1 device(s):
  0:  ezcap USB 2.0 DVB-T/DAB/FM dongle

Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle
Found Rafael Micro R820T tuner

Current configuration:
Vendor ID:              0x0bda
Product ID:             0x2838
Manufacturer:           Realtek
Product:                RTL2838UHIDIR
Serial number:          00000013
Serial number enabled:  yes
IR endpoint enabled:    yes
Remote wakeup enabled:  no

OpenBSD dmesg says 
ugen0 at uhub0 port 2 "Realtek RTL2838UHIDIR" rev 2.00/1.00 addr 2

I've got more downloading to do before I can actually hear anything on it.

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