@@ -260,8 +260,8 @@ sgdp4_prediction_find_aos(
260260 && (window <= 0 || timeval_elapsed (& t , tv ) < window )) {
261261 delta_t = -30 * (
262262 SU_RAD2DEG (self -> pos_azel .elevation ) * (self -> alt / 8400. + .46 ) - 2.0 );
263- if (SU_ABS (delta_t ) > max_delta_t )
264- delta_t = max_delta_t * (delta_t / SU_ABS (delta_t ));
263+ if (fabs (delta_t ) > max_delta_t )
264+ delta_t = max_delta_t * (delta_t / fabs (delta_t ));
265265
266266 timeval_add_double (& t , delta_t );
267267 sgdp4_prediction_update (self , & t );
@@ -277,13 +277,13 @@ sgdp4_prediction_find_aos(
277277 * SU_RAD2DEG (self -> pos_azel .elevation )
278278 * sqrt (self -> alt );
279279
280- if (sufeq (self -> pos_azel .elevation , 0 , 8.7e-5 ) || SU_ABS (delta_t ) < 1 ) {
280+ if (sufeq (self -> pos_azel .elevation , 0 , 8.7e-5 ) || fabs (delta_t ) < 1 ) {
281281 * aos = t ;
282282 return SU_TRUE ;
283283 }
284284
285- if (SU_ABS (delta_t ) > max_delta_t )
286- delta_t = max_delta_t * (delta_t / SU_ABS (delta_t ));
285+ if (fabs (delta_t ) > max_delta_t )
286+ delta_t = max_delta_t * (delta_t / fabs (delta_t ));
287287
288288 if (iters > 0 ) {
289289 /* Flipping signs? Overshoot detected. */
@@ -336,8 +336,8 @@ sgdp4_prediction_find_los(
336336 delta_t = 3.456
337337 * cos (self -> pos_azel .elevation - .017 )
338338 * sqrt (self -> alt );
339- if (SU_ABS (delta_t ) > max_delta_t )
340- delta_t = max_delta_t * (delta_t / SU_ABS (delta_t ));
339+ if (fabs (delta_t ) > max_delta_t )
340+ delta_t = max_delta_t * (delta_t / fabs (delta_t ));
341341
342342 timeval_add_double (& t , delta_t );
343343 sgdp4_prediction_update (self , & t );
@@ -354,8 +354,8 @@ sgdp4_prediction_find_los(
354354 * SU_RAD2DEG (self -> pos_azel .elevation )
355355 * sqrt (self -> alt );
356356
357- if (SU_ABS (delta_t ) > max_delta_t )
358- delta_t = max_delta_t * (delta_t / SU_ABS (delta_t ));
357+ if (fabs (delta_t ) > max_delta_t )
358+ delta_t = max_delta_t * (delta_t / fabs (delta_t ));
359359
360360 if (iters > 0 ) {
361361 /* Flipping signs? Overshoot detected. */
@@ -367,7 +367,7 @@ sgdp4_prediction_find_los(
367367 sgdp4_prediction_update (self , & t );
368368
369369 /* delta_t below 1 µs cannot be rendered with struct timeval */
370- if (sufeq (self -> pos_azel .elevation , 0 , 8.7e-5 ) || SU_ABS (delta_t ) < 1 ) {
370+ if (sufeq (self -> pos_azel .elevation , 0 , 8.7e-5 ) || fabs (delta_t ) < 1 ) {
371371 * los = t ;
372372 return SU_TRUE ;
373373 }
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