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--- elektor.c.orig 2014-12-08 03:00:20.000000000 -0800
+++ elektor.c 2014-12-08 03:00:29.000000000 -0800
@@ -1020,7 +1020,7 @@
//fprintf( stderr,"update-freq() cntrfreq=%f, hwfreq=%f\n",fg.passband_center,hwfreq);
// This routine is called from the screen thread.
- if ( abs(old_hwfreq-hwfreq) > 0.001 )
+ if ( fabs(old_hwfreq-hwfreq) > 0.001 )
{ Setup_Preselector();
old_hwfreq = hwfreq;
show_elektor_parms();
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