/usr/ is in libsdl2-ttf-dev 2.0.14+dfsg1-1.
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..
/usr/share/doc/libsdl2-ttf-dev/examples/showfont.c
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/SDL2_ttf.pc
/usr/lib/x86_64-linux-gnu/libSDL2_ttf.a
/usr/include/
/usr/include/SDL2/
/usr/include/SDL2/SDL_ttf.h
/usr/share/
/usr/share/doc/
/usr/share/doc/libsdl2-ttf-dev/
/usr/share/doc/libsdl2-ttf-dev/examples/
/usr/share/doc/libsdl2-ttf-dev/examples/glfont.c
/usr/share/doc/libsdl2-ttf-dev/copyright
/usr/lib/x86_64-linux-gnu/libSDL2_ttf-2.0.so
/usr/lib/x86_64-linux-gnu/libSDL2_ttf.so
/usr/share/doc/libsdl2-ttf-dev/README.txt
/usr/share/doc/libsdl2-ttf-dev/changelog.Debian.gz