c++ - SOIL OpenGL LNK2019 error -

working opengl using soil texture binding library. whenever try , load texture, these errors:

1>libsoil.a(stb_image_aug.o) : error lnk2019: unresolved external symbol ___chkstk_ms referenced in function _stbi_jpeg_load_from_file 1>libsoil.a(image_helper.o) : error lnk2019: unresolved external symbol _sqrtf referenced in function _rgbe_to_rgbdiva2 1>c:\users\student\dropbox\work\year 2\graphics 1\coursework\graphicscoursework\debug\graphicscoursework.exe : fatal error lnk1120: 2 unresolved externals 

the code use load these textures such:

int platform::loadtexture(){ gluint tex_plat = soil_load_ogl_texture(             "platform.png",             soil_load_auto,             soil_create_new_id,             soil_flag_mipmaps | soil_flag_invert_y | soil_flag_ntsc_safe_rgb | soil_flag_compress_to_dxt             );      if( tex_plat > 0 )     {         glenable( gl_texture_2d );         glbindtexture( gl_texture_2d, tex_plat );         return tex_plat;     }     else{         return 0;     } } 

any idea these errors mean?