They are not available in some compilers.
Signed-off-by: James Almer <jamr...@gmail.com>
---
configure | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/configure b/configure
index c2a9564..d4d7ae0 100755
--- a/configure
+++ b/configure
@@ -1730,7 +1730,9 @@ MATH_FUNCS="
atan2f
cbrt
cbrtf
+ copysign
cosf
+ erf
exp2
exp2f
expf
@@ -2718,6 +2720,7 @@ cropdetect_filter_deps="gpl"
delogo_filter_deps="gpl"
deshake_filter_select="pixelutils"
drawtext_filter_deps="libfreetype"
+dynaudnorm_filter_deps="copysign erf"
ebur128_filter_deps="gpl"
eq_filter_deps="gpl"
fftfilt_filter_deps="avcodec"
@@ -5130,6 +5133,7 @@ check_lib math.h sin -lm && LIBM="-lm"
disabled crystalhd || check_lib libcrystalhd/libcrystalhd_if.h
DtsCrystalHDVersion -lcrystalhd || disable crystalhd
atan2f_args=2
+copysign_args=2
ldexpf_args=2
powf_args=2
--
2.4.5
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