Hi all, I have been trying to get a bit of code running using the SeqAn lib but keep hitting an issue when I have find in my code. To check if it was an issue with my code or something else I attempted to build test_index.cpp from svn_repo .../projects/tests/index/. My setup: gcc version 4.1.2 Seqan_Release_1.2 from the website g++ -c -I. test_index.cpp //No issues g++ test_index.o -o test_index //This blows up with the same issues that I get in my code: see errors below errors: test_index.o: In function `main': test_index.cpp:(.text+0xe0e2): undefined reference to `testQGramIndex()' test_index.cpp:(.text+0xe11f): undefined reference to `testShapes()' test_index.cpp:(.text+0xe18c): undefined reference to `testBWTWalk(char const*)' test_index.cpp:(.text+0xe1f4): undefined reference to `testIndexCreation()' test_index.o: In function `bool seqan::awriteAt<void, seqan::Pair<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned char, 7u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Pair<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned char, 7u, void>, seqan::Tag<seqan::_Compressed> > const*, unsigned long, long, aiocb&)': test_index.cpp:(.text._ZN5seqan8awriteAtIvNS_4PairINS1_ImmNS_3TagINS_11_CompressedEEEEENS_5TupleIhLj7EvEES4_EEmlEEbRNS_4FileINS_5AsyncIT_EEEEPKT0_T1_T2_R5aiocb[bool seqan::awriteAt<void, seqan::Pair<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned char, 7u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Pair<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned char, 7u, void>, seqan::Tag<seqan::_Compressed> > const*, unsigned long, long, aiocb&)]+0xb8): undefined reference to `aio_write64' test_index.o: In function `bool seqan::awriteAt<void, seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> > const*, unsigned long, long, aiocb&)': test_index.cpp:(.text._ZN5seqan8awriteAtIvNS_4PairImmNS_3TagINS_11_CompressedEEEEEmlEEbRNS_4FileINS_5AsyncIT_EEEEPKT0_T1_T2_R5aiocb[bool seqan::awriteAt<void, seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> > const*, unsigned long, long, aiocb&)]+0x9a): undefined reference to `aio_write64' test_index.o: In function `bool seqan::awriteAt<void, seqan::Pair<unsigned long, seqan::Tuple<unsigned long, 7u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Pair<unsigned long, seqan::Tuple<unsigned long, 7u, void>, seqan::Tag<seqan::_Compressed> > const*, unsigned long, long, aiocb&)': test_index.cpp:(.text._ZN5seqan8awriteAtIvNS_4PairImNS_5TupleImLj7EvEENS_3TagINS_11_CompressedEEEEEmlEEbRNS_4FileINS_5AsyncIT_EEEEPKT0_T1_T2_R5aiocb[bool seqan::awriteAt<void, seqan::Pair<unsigned long, seqan::Tuple<unsigned long, 7u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Pair<unsigned long, seqan::Tuple<unsigned long, 7u, void>, seqan::Tag<seqan::_Compressed> > const*, unsigned long, long, aiocb&)]+0x9a): undefined reference to `aio_write64' test_index.o: In function `bool seqan::awriteAt<void, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 6u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 6u, void>, seqan::Tag<seqan::_Compressed> > const*, unsigned long, long, aiocb&)': test_index.cpp:(.text._ZN5seqan8awriteAtIvNS_6TripleImNS_5TupleImLj3EvEENS2_ImLj6EvEENS_3TagINS_11_CompressedEEEEEmlEEbRNS_4FileINS_5AsyncIT_EEEEPKT0_T1_T2_R5aiocb[bool seqan::awriteAt<void, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 6u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 6u, void>, seqan::Tag<seqan::_Compressed> > const*, unsigned long, long, aiocb&)]+0xb1): undefined reference to `aio_write64' test_index.o: In function `bool seqan::awriteAt<void, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 4u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 4u, void>, seqan::Tag<seqan::_Compressed> > const*, unsigned long, long, aiocb&)': test_index.cpp:(.text._ZN5seqan8awriteAtIvNS_6TripleImNS_5TupleImLj3EvEENS2_ImLj4EvEENS_3TagINS_11_CompressedEEEEEmlEEbRNS_4FileINS_5AsyncIT_EEEEPKT0_T1_T2_R5aiocb[bool seqan::awriteAt<void, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 4u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 4u, void>, seqan::Tag<seqan::_Compressed> > const*, unsigned long, long, aiocb&)]+0x9a): undefined reference to `aio_write64' test_index.o:test_index.cpp:(.text._ZN5seqan8awriteAtIvNS_6TripleImNS_5TupleImLj3EvEENS2_ImLj5EvEENS_3TagINS_11_CompressedEEEEEmlEEbRNS_4FileINS_5AsyncIT_EEEEPKT0_T1_T2_R5aiocb[bool seqan::awriteAt<void, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 5u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 5u, void>, seqan::Tag<seqan::_Compressed> > const*, unsigned long, long, aiocb&)]+0xb1): more undefined references to `aio_write64' follow test_index.o: In function `seqan::waitFor(aiocb&)': test_index.cpp:(.text._ZN5seqan7waitForER5aiocb[seqan::waitFor(aiocb&)]+0x23): undefined reference to `aio_suspend64' test_index.o: In function `seqan::waitFor(aiocb&, long)': test_index.cpp:(.text._ZN5seqan7waitForER5aiocbl[seqan::waitFor(aiocb&, long)]+0x1d): undefined reference to `aio_error64' test_index.cpp:(.text._ZN5seqan7waitForER5aiocbl[seqan::waitFor(aiocb&, long)]+0xbc): undefined reference to `aio_suspend64' test_index.o: In function `bool seqan::cancel<void>(seqan::File<seqan::Async<void> >&, aiocb&)': test_index.cpp:(.text._ZN5seqan6cancelIvEEbRNS_4FileINS_5AsyncIT_EEEER5aiocb[bool seqan::cancel<void>(seqan::File<seqan::Async<void> >&, aiocb&)]+0x1c): undefined reference to `aio_cancel64' test_index.o: In function `bool seqan::areadAt<void, seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >*, unsigned long, long, aiocb&)': test_index.cpp:(.text._ZN5seqan7areadAtIvNS_4PairImmNS_3TagINS_11_CompressedEEEEEmlEEbRNS_4FileINS_5AsyncIT_EEEEPT0_T1_T2_R5aiocb[bool seqan::areadAt<void, seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >*, unsigned long, long, aiocb&)]+0x9a): undefined reference to `aio_read64' test_index.o: In function `bool seqan::areadAt<void, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 6u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 6u, void>, seqan::Tag<seqan::_Compressed> >*, unsigned long, long, aiocb&)': test_index.cpp:(.text._ZN5seqan7areadAtIvNS_6TripleImNS_5TupleImLj3EvEENS2_ImLj6EvEENS_3TagINS_11_CompressedEEEEEmlEEbRNS_4FileINS_5AsyncIT_EEEEPT0_T1_T2_R5aiocb[bool seqan::areadAt<void, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 6u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<unsigned long, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned long, 6u, void>, seqan::Tag<seqan::_Compressed> >*, unsigned long, long, aiocb&)]+0xb1): undefined reference to `aio_read64' test_index.o: In function `bool seqan::areadAt<void, seqan::Triple<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned char, 6u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned char, 6u, void>, seqan::Tag<seqan::_Compressed> >*, unsigned long, long, aiocb&)': test_index.cpp:(.text._ZN5seqan7areadAtIvNS_6TripleINS_4PairImmNS_3TagINS_11_CompressedEEEEENS_5TupleImLj3EvEENS7_IhLj6EvEES5_EEmlEEbRNS_4FileINS_5AsyncIT_EEEEPT0_T1_T2_R5aiocb[bool seqan::areadAt<void, seqan::Triple<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned char, 6u, void>, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<unsigned char, 6u, void>, seqan::Tag<seqan::_Compressed> >*, unsigned long, long, aiocb&)]+0x97): undefined reference to `aio_read64' test_index.o: In function `bool seqan::areadAt<void, seqan::Triple<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<seqan::SimpleType<unsigned char, seqan::_Dna>, 6u, seqan::Tag<seqan::_Compressed> >, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<seqan::SimpleType<unsigned char, seqan::_Dna>, 6u, seqan::Tag<seqan::_Compressed> >, seqan::Tag<seqan::_Compressed> >*, unsigned long, long, aiocb&)': test_index.cpp:(.text._ZN5seqan7areadAtIvNS_6TripleINS_4PairImmNS_3TagINS_11_CompressedEEEEENS_5TupleImLj3EvEENS7_INS_10SimpleTypeIhNS_4_DnaEEELj6ES5_EES5_EEmlEEbRNS_4FileINS_5AsyncIT_EEEEPT0_T1_T2_R5aiocb[bool seqan::areadAt<void, seqan::Triple<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<seqan::SimpleType<unsigned char, seqan::_Dna>, 6u, seqan::Tag<seqan::_Compressed> >, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<seqan::SimpleType<unsigned char, seqan::_Dna>, 6u, seqan::Tag<seqan::_Compressed> >, seqan::Tag<seqan::_Compressed> >*, unsigned long, long, aiocb&)]+0xbd): undefined reference to `aio_read64' test_index.o: In function `bool seqan::areadAt<void, seqan::Triple<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<seqan::SimpleType<unsigned char, seqan::_Dna5>, 6u, seqan::Tag<seqan::_Compressed> >, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<seqan::SimpleType<unsigned char, seqan::_Dna5>, 6u, seqan::Tag<seqan::_Compressed> >, seqan::Tag<seqan::_Compressed> >*, unsigned long, long, aiocb&)': test_index.cpp:(.text._ZN5seqan7areadAtIvNS_6TripleINS_4PairImmNS_3TagINS_11_CompressedEEEEENS_5TupleImLj3EvEENS7_INS_10SimpleTypeIhNS_5_Dna5EEELj6ES5_EES5_EEmlEEbRNS_4FileINS_5AsyncIT_EEEEPT0_T1_T2_R5aiocb[bool seqan::areadAt<void, seqan::Triple<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<seqan::SimpleType<unsigned char, seqan::_Dna5>, 6u, seqan::Tag<seqan::_Compressed> >, seqan::Tag<seqan::_Compressed> >, unsigned long, long>(seqan::File<seqan::Async<void> >&, seqan::Triple<seqan::Pair<unsigned long, unsigned long, seqan::Tag<seqan::_Compressed> >, seqan::Tuple<unsigned long, 3u, void>, seqan::Tuple<seqan::SimpleType<unsigned char, seqan::_Dna5>, 6u, seqan::Tag<seqan::_Compressed> >, seqan::Tag<seqan::_Compressed> >*, unsigned long, long, aiocb&)]+0xbd): undefined reference to `aio_read64' test_index.o:test_index.cpp:(.text._ZN5seqan7areadAtIvcmlEEbRNS_4FileINS_5AsyncIT_EEEEPT0_T1_T2_R5aiocb[bool seqan::areadAt<void, char, unsigned long, long>(seqan::File<seqan::Async<void> >&, char*, unsigned long, long, aiocb&)]+0x8c): more undefined references to `aio_read64' follow collect2: ld returned 1 exit status Any ideas? Cheers, Jared Wilkening