LibreELEC:/usr/lib/libretro # retroarch  -v -L /tmp/cores/mednafen_psx_libretro.so /storage/roms/psx/Spider-Man.bin
[WARN] --libretro argument "/tmp/cores/mednafen_psx_libretro.so" is neither a file nor directory. Ignoring.
[INFO] RetroArch 1.7.3 (Git 665628e)
[INFO] Redirecting save file to "/storage/roms/psx/Spider-Man.srm".
[INFO] Redirecting savestate to "/storage/roms/psx/Spider-Man.state".
[INFO] === Build =======================================
Capabilities: MMX MMXEXT SSE1 SSE2 SSE3 SSSE3 SSE4 SSE4.2 AVX
Built: Aug 16 2018
[INFO] Version: 1.7.3
[INFO] Git: 665628e
[INFO] =================================================
[ERROR] RetroArch is built for dynamic libretro cores, but libretro_path is not set. Cannot continue.
[ERROR] Fatal error received in: "init_libretro_sym()"
[ERROR] This core requires a content file, could not load content.