라이브러리 파일을 등록안하고 컴파일 했을 때 이 에러가 뜰 수 있습니다.
외부 라이브러리를 쓰신것 같은데 .lib 파일을 등록해 보세요..

사악왕 님이 쓰신 글 :
: [ILINK32 Error] Error: Unresolved external '_OCIHandleFree' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIErrorGet' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIBindByName' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIDefineByPos' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIStmtExecute' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCITransCommit' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIAttrGet' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCILobWrite' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIAttrSet' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIDescriptorFree' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIHandleAlloc' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIDescriptorAlloc' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIStmtPrepare' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIParamGet' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIStmtFetch' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCILobLocatorIsInit' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCILobRead' referenced from
: [ILINK32 Error] Error: Unresolved external 'TObj::Add()' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCISessionEnd' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIServerDetach' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIInitialize' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIEnvInit' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCIServerAttach' referenced from
: [ILINK32 Error] Error: Unresolved external '_OCISessionBegin' referenced from
: [ILINK32 Warning] Warning: Public symbol '_g_MapOpr' defined in both module
: [ILINK32 Warning] Warning: Public symbol '_g_pForm' defined in both module
: [ILINK32 Error] Error: Unable to perform link
:
: 이러한 에러가 뜨는 이유가 있으면 알고 싶어서요 [ILINK32 Error]-> 이에러 너무 싫어요 ㅠ.ㅠ
: 참 신기한 에러에요 ㅠ.ㅠ