freetype+SDL+SDL_ttf的安装问题

在3519A上绘制字符打算用freetype+SDL+SDL_ttf的方案，但安装后测试程序编译不过。整个流程参考https://blog.csdn.net/simonforfuture/article/details/78629905  

编译测试程序：
arm-himix200-linux-gcc test.c `sdl-config --cflags --libs` -I/opt/sdl_lib/include -I/opt/sdl_lib/include/SDL -L/opt/sdl_lib/lib -lSDL -lSDL_ttf -Wl,-rpath -o test.o

报错：
/opt/hisi-linux/x86-arm/arm-himix200-linux/host_bin/../lib/gcc/arm-linux-gnueabi/6.3.0/../../../../arm-linux-gnueabi/bin/ld: warning: libfreetype.so.6, needed by /usr/local/lib/libSDL_ttf.so, not found (try using -rpath or -rpath-link)
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Outline_Transform'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Load_Glyph'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Get_Kerning'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Set_Pixel_Sizes'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Stroker_Done'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Open_Face'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Done_Face'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Done_FreeType'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Init_FreeType'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Set_Charmap'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Stroker_Set'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Done_Glyph'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Glyph_To_Bitmap'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Stroker_New'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Get_Glyph'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Get_Char_Index'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Render_Glyph'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Set_Char_Size'
/usr/local/lib/libSDL_ttf.so: undefined reference to `FT_Glyph_Stroke'
collect2: error: ld returned 1 exit status

但freetype，SDL和SDL_ttf已经在/usr/local/lib/路径下装好了啊，是不是我还需要安装什么库？
系统是ubuntu16.04 64位.