Concatenating two parts of a video into a gif

Makefile

FRAMERATE:=12

shoyo-spike.gif: clip-a.gif clip-b.gif
	ffmpeg -i clip-a.gif -i clip-b.gif     \
		-filter_complex 'concat=n=2:v=1:a=0,scale=480:-1' \
		-r ${FRAMERATE} -y $@

clip-a.gif:
	ffmpeg -ss 06:08 -to 06:21.5 -i source-clip.mp4 -r ${FRAMERATE} -y $@

clip-b.gif:
	ffmpeg -ss 06:36.0 -to 06:39 -i source-clip.mp4 -r ${FRAMERATE} -y $@


## Example doing it all in a single command.
single.gif:
	ffmpeg \
		-ss 06:08 -to 06:21.5 -i source-clip.mp4 \
		-ss 06:36 -to 06:39   -i source-clip.mp4 \
		-filter_complex 'concat=n=2:v=1:a=0,scale=480:-1' \
		-r ${FRAMERATE} -y $@

make final.gif

I tried making the gif as a single command and it worked! ffmpeg is also able to make a smaller final file so I bumped the default framerate back up to 12.