Nothing entered.
OS Guix, Linux Libre 5.4.30, Synfig 1.2.2 from Guix repository
guix describe
Generation 10 Apr 19 2020 21:25:42 (current)
guix 58d5b8b
repository URL: https://git.savannah.gnu.org/git/guix.git
branch: master
commit: 58d5b8b44b37b1f9df279ed02a3c11f580caa634
$ uname -a
Linux antelope 5.4.30-gnu #1 SMP 1 x86_64 GNU/Linux
$ synfig --version
No LADSPA plugins were found!
Check your LADSPA_PATH environment variable.
synfig(20233)
PM info: rendering threads 6
synfig(20233)
PM warning: Cannot open ./synfig_modules.cfg
synfig(20233)
PM warning: Cannot open /home/me/.local/share/synfig/synfig_modules.cfg
synfig(20233)
PM info: Loading modules from /gnu/store/pvv7nqy4w8kwnrxnna5ql3v47791dnfv-synfig-1.2.2/etc/synfig_modules.cfg
synfig(20233)
PM info: Loading lyr_std..
synfig(20233)
PM info: Loading lyr_freetype..
synfig(20233)
PM info: Loading mod_geometry..
synfig(20233)
PM info: Loading mod_gradient..
synfig(20233)
PM info: Loading mod_particle..
synfig(20233)
PM info: Loading mod_example..
synfig(20233)
PM info: Loading mod_gif..
synfig(20233)
PM info: Loading mod_imagemagick..
synfig(20233)
PM info: Loading mod_magickpp..
synfig(20233)
PM info: Loading mod_mng..
synfig(20233)
PM info: Loading mod_noise..
synfig(20233)
PM info: Loading mod_filter..
synfig(20233)
PM info: Loading mod_ffmpeg..
synfig(20233)
PM info: Loading mod_bmp..
synfig(20233)
PM info: Loading mod_dv..
synfig(20233)
PM info: Loading mod_png..
synfig(20233)
PM info: Loading mod_ppm..
synfig(20233)
PM info: Loading mod_openexr..
synfig(20233)
PM info: Loading mod_jpeg..
synfig(20233)
PM info: Loading mod_libavcodec..
/gnu/store/pvv7nqy4w8kwnrxnna5ql3v47791dnfv-synfig-1.2.2/bin/synfig: warning: Unable to find module "mod_libavcodec" (file not found)
synfig(20233)
PM info: Loading mod_yuv420p..
synfig(20233)
PM info: Loading mod_svg..
synfig 1.2.2
PS: Also I see this messages, think the package port into guix may have mistakes.