@MatN I more or less did your initial steps, but did not create the appimage. I didn't even know you could do a valgrind with an appimage. I did everything from root with "su" and didn't put "sudo". 10) bld_prepare.sh debian works fine except for libgl not being installed. I finally found that "apt install libgl-dev" works. Other packages I had to install externally to bld_prepare.sh are: gawk; make; libgtk2.0-dev (only gtk2 won't do); and of course: git; gdb and valgrind. As I told Andrew, CinGG works just fine in my 32-bit debian 11; it's only with valgrind that so many problems come up (which never occurred in my Arch). I guess the valgrind + vm combination is fatal. PS: the instructions to use valgrind were given to me by GG (all from root): 1- git clone ... cinelerra5 2- copy cinelerra-5.1 folder in /tmp 3- cd /tmp/cinelerra-5.1 4- ./bld.sh 5- CFLAGS=-ggdb make -j16 rebuild_all 6- valgrind -v --log-file=/tmp/val.log --leak-check=full --num-callers=32 /tmp/cinelerra-5.1/bin/./cin 7- in val.log look for "error" and "illegal" words. With the same procedure you can start gdb instead of valgrind. PPS: thanks for the procedure to create the appimage; I saved it and will try to do it sometime.