Defines the current path to be searched before or after the system LIBPATH when locating DLLs.

#define INCL_DOSMISC
#include <os2.h>

PSZ       pszExtLIBPATH;  /*  Extended LIBPATH string. */
ULONG     flags;          /*  Flag indicating when the new path is searched. */
APIRET    ulrc;           /*  Return Code. */

ulrc = DosSetExtLIBPATH(pszExtLIBPATH, flags);