Apparently there is a missing link from libcsnd.so to the tcl libraries. After installation, trying to "import csnd" from python fails with the following error (under python2.4): Traceback (most recent call last): File "", line 1, in ? File "/usr/lib/python2.4/site-packages/csnd.py", line 7, in ? import _csnd ImportError: /usr/lib/libcsnd.so: undefined symbol: Tcl_GetStringFromObj Modifying SConstruct to link the csound interfaces against tcl seems to do the trick. Anybody else experiencing this? In case it is useful, I'm building with these flags: BUILDFLAGS=useDouble=1 usePortAudio=1 usePortMIDI=1 useALSA=1 \ useJack=1 useFLTK=1 buildCsound5GUI=1 buildWinsound=1 \ generatePdf=0 useOSC=1 buildPythonOpcodes=1 \ dynamicCsoundLibrary=1 buildPDClass=1 \ buildDSSI=1 buildUtilities=1 buildTclcsound=1 \ buildVirtual=1 buildInterfaces=1 buildJavaWrapper=1 \ buildCSEditor=1 buildNewParser=0 prefix=/usr -- Felipe Sateler