@@ -2836,7 +2836,6 @@ unix_protocol_deps="sys_un_h"

 unix_protocol_select="network"

 # filters

-aemphasis_filter_deps="cabs cexp"

 amovie_filter_deps="avcodec avformat"

 aresample_filter_deps="swresample"

 ass_filter_deps="libass"

@@ -18,8 +18,6 @@

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

-#include <complex.h>

-

 #include "libavutil/opt.h"

 #include "avfilter.h"

 #include "internal.h"

@@ -189,14 +187,15 @@ static inline void set_lp_rbj(BiquadD2 *bq, double fc, double q, double sr, doub

 static double freq_gain(BiquadCoeffs *c, double freq, double sr)

 {

-    double complex z, w;

+    double zr, zi;

     freq *= 2.0 * M_PI / sr;

-    w = 0 + I * freq;

-    z = 1.0 / cexp(w);

+    zr = cos(freq);

+    zi = -sin(freq);

-    return cabs(((double complex)c->a0 + c->a1 * z + c->a2 * z*z) /

-                ((double complex)1.0 + c->b1 * z + c->b2 * z*z));

+    /* |(a0 + a1*z + a2*z^2)/(1 + b1*z + b2*z^2)| */

+    return hypot(c->a0 + c->a1*zr + c->a2*(zr*zr-zi*zi), c->a1*zi + 2*c->a2*zr*zi) /

+           hypot(1 + c->b1*zr + c->b2*(zr*zr-zi*zi), c->b1*zi + 2*c->b2*zr*zi);

 }

 static int config_input(AVFilterLink *inlink)