How to get working 'blend' filter

[endryha]

I am trying to implement feature that blends 2 videos together but it seems that prebuilt ffmpeg binaries missing this filter. So is there a way to built in this filter?

Running ffmpeg -filters produces following output:

Filters:
T.. = Timeline support
.S. = Slice threading
..C = Commmand support A = Audio input/output V = Video input/output N = Dynamic number and/or type of input/output | = Source or sink filter
T.. adelay A->A Delay one or more audio channels.
... aecho A->A Add echoing to the audio.
... aeval A->A Filter audio signal according to a specified expression.
T.. afade A->A Fade in/out input audio.
... aformat A->A Convert the input audio to one of the specified formats.
... ainterleave N->A Temporally interleave audio inputs.
... allpass A->A Apply a two-pole all-pass filter.
... amerge N->A Merge two or more audio streams into a single multi-channel stream.
... amix N->A Audio mixing.
... anull A->A Pass the source unchanged to the output.
T.. apad A->A Pad audio with silence.
... aperms A->A Set permissions for the output audio frame.
... aphaser A->A Add a phasing effect to the audio.
... aresample A->A Resample audio data.
... aselect A->N Select audio frames to pass in output.
... asendcmd A->A Send commands to filters.
... asetnsamples A->A Set the number of samples for each output audio frames.
... asetpts A->A Set PTS for the output audio frame.
... asetrate A->A Change the sample rate without altering the data.
... asettb A->A Set timebase for the audio output link.
... ashowinfo A->A Show textual information for each audio frame.
... asplit A->N Pass on the audio input to N audio outputs.
... astats A->A Show time domain statistics about audio frames.
... astreamsync AA->AA Copy two streams of audio data in a configurable order.
..C atempo A->A Adjust audio tempo.
... atrim A->A Pick one continuous section from the input, drop the rest.
... bandpass A->A Apply a two-pole Butterworth band-pass filter.
... bandreject A->A Apply a two-pole Butterworth band-reject filter.
... bass A->A Boost or cut lower frequencies.
... biquad A->A Apply a biquad IIR filter with the given coefficients. ... channelmap