[Haskell] GHC6.8.1 can not compile the simple example

Link error is: [davidyu@linuxpower test]$ ghc c.hs c.o: In function `rM7_info': (.text+0xaa): undefined reference to `containerszm0zi1zi0zi0_DataziMap_lookup_closure' c.o: In function `rMd_info': (.text+0x1fa): undefined reference to `containerszm0zi1zi0zi0_DataziMap_fromList_closure' c.o: In function `sVJ_info': (.text+0xa3b): undefined reference to `__stginit_containerszm0zi1zi0zi0_DataziMap_' c.o: In function `rM7_srt': (.data+0x18): undefined reference to `containerszm0zi1zi0zi0_DataziMap_lookup_closure' c.o: In function `rMd_srt': (.data+0x60): undefined reference to `containerszm0zi1zi0zi0_DataziMap_fromList_closure' collect2: ld returned 1 exit status