Ceacy :

OgreCEGUITexture isn't exported (declared as _OgrePrivate), so the code won't compile under Windows : setOgreTexture() is, from the dll's point of vue, unknown :

 error LNK2001: unresolved external symbol "public: void __thiscall CEGUI::OgreCEGUITexture::setOgreTexture(class Ogre::TexturePtr &)"

A fix could be replacing :

 CEGUI::OgreCEGUITexture* ceguiTex = dynamic_cast<CEGUI::OgreCEGUITexture*>( mGUIRenderer->createTexture() );
 ceguiTex->setOgreTexture( ogreTex );

By :

CEGUI::OgreCEGUITexture* ceguiTex = dynamic_cast<CEGUI::OgreCEGUITexture*>( mGUIRenderer->createTexture( ogreTex ) );