Errors with make systemshock

Hello.

I ran build_deps.sh and went well, then cmake . with no problem, but with make systemshock

I got the following and don't know how to solve.

Thank you.

make systemshock
[ 1%] Built target VOX_LIB
[ 5%] Built target ADLMIDI_LIB
[ 9%] Built target EDMS_LIB
[ 10%] Built target LG_LIB
[ 48%] Built target 2D_LIB
[ 79%] Built target GAME_LIB
[ 80%] Built target PALETTE_LIB
[ 82%] Built target UI_LIB
[ 83%] Built target DSTRUCT_LIB
[ 85%] Built target FIX_LIB
[ 86%] Built target INPUT_LIB
[ 90%] Built target 3D_LIB
[ 93%] Built target RES_LIB
[ 95%] Built target AFILE_LIB
[ 96%] Built target RND_LIB
[ 96%] Built target FIXPP_LIB
[ 97%] Built target GR_LIB
[ 98%] Linking CXX executable systemshock
/usr/bin/ld: warning: libfluidsynth.so.2, needed by /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libSDL2_mixer.so, may conflict with libfluidsynth.so.1
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libSDL2_mixer.so: undefined reference to `SDL_RWclose'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libSDL2_mixer.so: undefined reference to `SDL_RWread'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libSDL2_mixer.so: undefined reference to `SDL_RWseek'
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libSDL2_mixer.so: undefined reference to `SDL_RWtell'
collect2: error: ld returned 1 exit status
make[3]: *** [CMakeFiles/systemshock.dir/build.make:264: systemshock] Error 1
make[2]: *** [CMakeFiles/Makefile2:190: CMakeFiles/systemshock.dir/all] Error 2
make[1]: *** [CMakeFiles/Makefile2:197: CMakeFiles/systemshock.dir/rule] Error 2
make: *** [Makefile:150: systemshock] Error 2