won't build opus_encoder

here's what is happening-
opus$ make
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o src/analysis.o src/analysis.c
In file included from src/analysis.c:45:
celt/float_cast.h:129:10: warning: #warning "Don't have the functions lrint() and lrintf ()." [-Wcpp]
129 | #warning "Don't have the functions lrint() and lrintf ()."
| ^~~~~~~
celt/float_cast.h:130:10: warning: #warning "Replacing these functions with a standard C cast." [-Wcpp]
130 | #warning "Replacing these functions with a standard C cast."
| ^~~~~~~
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o src/mlp.o src/mlp.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o src/mlp_data.o src/mlp_data.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o src/opus.o src/opus.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o src/opus_encoder.o src/opus_encoder.c
In file included from src/opus_encoder.c:38:
celt/float_cast.h:129:10: warning: #warning "Don't have the functions lrint() and lrintf ()." [-Wcpp]
129 | #warning "Don't have the functions lrint() and lrintf ()."
| ^~~~~~~
celt/float_cast.h:130:10: warning: #warning "Replacing these functions with a standard C cast." [-Wcpp]
130 | #warning "Replacing these functions with a standard C cast."
| ^~~~~~~
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o src/opus_decoder.o src/opus_decoder.c
In file included from src/opus_decoder.c:47:
celt/float_cast.h:129:10: warning: #warning "Don't have the functions lrint() and lrintf ()." [-Wcpp]
129 | #warning "Don't have the functions lrint() and lrintf ()."
| ^~~~~~~
celt/float_cast.h:130:10: warning: #warning "Replacing these functions with a standard C cast." [-Wcpp]
130 | #warning "Replacing these functions with a standard C cast."
| ^~~~~~~
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o src/opus_multistream.o src/opus_multistream.c
In file included from src/opus_multistream.c:37:
celt/float_cast.h:129:10: warning: #warning "Don't have the functions lrint() and lrintf ()." [-Wcpp]
129 | #warning "Don't have the functions lrint() and lrintf ()."
| ^~~~~~~
celt/float_cast.h:130:10: warning: #warning "Replacing these functions with a standard C cast." [-Wcpp]
130 | #warning "Replacing these functions with a standard C cast."
| ^~~~~~~
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o src/opus_multistream_encoder.o src/opus_multistream_encoder.c
In file included from src/opus_multistream_encoder.c:37:
celt/float_cast.h:129:10: warning: #warning "Don't have the functions lrint() and lrintf ()." [-Wcpp]
129 | #warning "Don't have the functions lrint() and lrintf ()."
| ^~~~~~~
celt/float_cast.h:130:10: warning: #warning "Replacing these functions with a standard C cast." [-Wcpp]
130 | #warning "Replacing these functions with a standard C cast."
| ^~~~~~~
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o src/opus_multistream_decoder.o src/opus_multistream_decoder.c
In file included from src/opus_multistream_decoder.c:37:
celt/float_cast.h:129:10: warning: #warning "Don't have the functions lrint() and lrintf ()." [-Wcpp]
129 | #warning "Don't have the functions lrint() and lrintf ()."
| ^~~~~~~
celt/float_cast.h:130:10: warning: #warning "Replacing these functions with a standard C cast." [-Wcpp]
130 | #warning "Replacing these functions with a standard C cast."
| ^~~~~~~
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o src/repacketizer.o src/repacketizer.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/bands.o celt/bands.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/celt.o celt/celt.c
In file included from celt/celt.c:48:
celt/float_cast.h:129:10: warning: #warning "Don't have the functions lrint() and lrintf ()." [-Wcpp]
129 | #warning "Don't have the functions lrint() and lrintf ()."
| ^~~~~~~
celt/float_cast.h:130:10: warning: #warning "Replacing these functions with a standard C cast." [-Wcpp]
130 | #warning "Replacing these functions with a standard C cast."
| ^~~~~~~
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/celt_decoder.o celt/celt_decoder.c
In file included from celt/celt_decoder.c:49:
celt/float_cast.h:129:10: warning: #warning "Don't have the functions lrint() and lrintf ()." [-Wcpp]
129 | #warning "Don't have the functions lrint() and lrintf ()."
| ^~~~~~~
celt/float_cast.h:130:10: warning: #warning "Replacing these functions with a standard C cast." [-Wcpp]
130 | #warning "Replacing these functions with a standard C cast."
| ^~~~~~~
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/celt_encoder.o celt/celt_encoder.c
In file included from celt/celt_encoder.c:49:
celt/float_cast.h:129:10: warning: #warning "Don't have the functions lrint() and lrintf ()." [-Wcpp]
129 | #warning "Don't have the functions lrint() and lrintf ()."
| ^~~~~~~
celt/float_cast.h:130:10: warning: #warning "Replacing these functions with a standard C cast." [-Wcpp]
130 | #warning "Replacing these functions with a standard C cast."
| ^~~~~~~
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/celt_lpc.o celt/celt_lpc.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/cwrs.o celt/cwrs.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/entcode.o celt/entcode.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/entdec.o celt/entdec.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/entenc.o celt/entenc.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/kiss_fft.o celt/kiss_fft.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/laplace.o celt/laplace.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/mathops.o celt/mathops.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/mdct.o celt/mdct.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/modes.o celt/modes.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/opus_custom_demo.o celt/opus_custom_demo.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/pitch.o celt/pitch.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/quant_bands.o celt/quant_bands.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/rate.o celt/rate.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o celt/vq.o celt/vq.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o silk/A2NLSF.o silk/A2NLSF.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o silk/CNG.o silk/CNG.c
xtensa-esp32s3-elf-gcc -Os -g0 -ffast-math -fno-common -mlongcalls -DOPUS_BUILD -DOPUS_HAVE_FLOAT -DFIXED_POINT -DFLOAT_APPROX -DNONTHREADSAFE_PSEUDOSTACK -Iinclude -Isrc -Icelt -Isilk -c -o silk/HP_variable_cutoff.o silk/HP_variable_cutoff.c
silk/HP_variable_cutoff.c:32:10: fatal error: main_FIX.h: No such file or directory
32 | #include "main_FIX.h"
| ^~~~~~~~~~~~
compilation terminated.
make: *** [: silk/HP_variable_cutoff.o] Error 1

This from Copilot-
Why your build is failing
Your current “Opus” directory is a hybrid, likely from a vendor like:

Seeed / ReSpeaker

XMOS

Espressif demo repos

Random forks on GitHub

These hybrid trees often contain:

CELT from Opus

A partial copy of the old SILK codec

Missing SILK-only headers

Removed float files

Removed fixed files

A Makefile that assumes a complete SILK-only tree

This hybrid cannot build a valid Opus encoder.

It’s not Opus.
It’s not SILK.
It’s a broken mix of both.

That’s why you keep hitting:

missing main_FLP.h

missing main_FIX.h

missing structs_FIX.h

missing float SILK files

missing fixed SILK files

Because your tree is not Opus.

⭐ The only correct path forward
If your goal is:

✔ A working Opus encoder on ESP32‑S3
then you must use:

The real Opus source tree
and only the real Opus source tree.

And that tree does not contain the files you’re looking for —
because Opus doesn’t use them.

Start with the reported make command and the failure in silk/HP_variable_cutoff.c, where main_FIX.h is missing; compare the build inputs with the available SILK sources. Review celt/float_cast.h warnings as context, then confirm that the intended Opus build completes without the missing-header error.