I HAVE ERRORS WITH whit base...

1>------ Build started: Project: Whits Base, Configuration: Release Win32 ------
1>Base.obj : error LNK2001: symbole externe non résolu _D3DXCreateTextureFromFileInMemory@16
1>Base.obj : error LNK2001: symbole externe non résolu _D3DXCreateSprite@8
1>Base.obj : error LNK2001: symbole externe non résolu _D3DXCreateFontA@48
1>C:\Users\Francis\Desktop\Whit's Base\Release\Whits Base.dll : fatal error LNK1120: 3 externes non résolus
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

what can i do?... please help me