I am making a Cin_20240630 build by myself for the OS UbuntuStudio_16.04_LTS_64bit.
I read in the MailingLists thanks to Phyllis and Andrew_R, I need to use specific instruction.

My usual steps were:
1) cd to "cinelerra-5.1" directory
2) make clean
3) ./autogen.sh
4) ./configure --with-single-user --without-shuttle-usb \
               --without-vaapi --without-vdpau \
               --disable-dav1d \
5) make 2>&1 | tee log
6) grep "\*\*\*.*error" -ai log
   ( Check for obvious build errors )
7) make install


From What I understand, with Cin_20240630 the steps are:
1) cd to "cinelerra-5.1" directory
2) make clean
3) export FFMPEG_EXTRA_CFG="--disable-decoder=vvc"
     ( before running autogen.sh / configure / make )
4) patch -p1 < alt_shortcuts.patch
     ( to use standard shortcuts )
5) ./autogen.sh
6) ./configure --with-single-user --without-shuttle-usb \
               --without-vaapi --without-vdpau \
               --disable-dav1d \
               --enable-libaom=no
     ( "--enable-libaom=no" added, without double quote )
7) make 2>&1 | tee log
8) grep "\*\*\*.*error" -ai log
   ( Check for obvious build errors )
9) make install


I am ignorant in Linux, so I would like to understand if the instruction
  export FFMPEG_EXTRA_CFG="--disable-decoder=vvc"
write something in somewhere or not.

Because my Operating System is UbuntuStudio_16.04, is there a way to build Cinelerra-GG using an old FFMPEG and/or libaom?
Could you drive me to make that, if possible (and it has sense) and easy for a simply User like me, please? Thanks!

IgorBeg