fatal error: libavutil/mem.h: No such file or directory--minor compile issue

[ThePowerTool]

Making all in src
make[2]: Entering directory '/home/guest/git/spek/src'
CXX spek-spek-artwork.o
CXX spek-spek-events.o
CXX spek-spek-platform.o
CXX spek-spek-preferences-dialog.o
CXX spek-spek-preferences.o
CXX spek-spek-ruler.o
CXX spek-spek-spectrogram.o
In file included from spek-spectrogram.cc:7:
spek-fft.h:7:10: fatal error: libavutil/mem.h: No such file or directory
7 | #include <libavutil/mem.h>
| ^~~~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [Makefile:753: spek-spek-spectrogram.o] Error 1
make[2]: Leaving directory '/home/guest/git/spek/src'
make[1]: *** [Makefile:482: all-recursive] Error 1
make[1]: Leaving directory '/home/guest/git/spek'
make: *** [Makefile:408: all] Error 2

Resolution:
change configure.ac from:
CXXFLAGS="$CXXFLAGS -std=gnu++11 -Wall -Wextra"

to:
CXXFLAGS="$CXXFLAGS -std=gnu++11 -Wall -Wextra -I/usr/include/ffmpeg"

I'm on Fedora 42.

Ref: #149

As the (above) resolution works, I'm just posting this as FYI.

I love this tool!