Unless you have installed the Cepstral SDK you can't compile mod_cepstral. Please visit www.cepstral.com to purchase voices and the SDK is included. /b On Aug 29, 2009, at 5:01 PM, Erwin Huang wrote: > mkdir .libs > Compiling mod_cepstral.c ... > mod_cepstral.c:41:19: error: swift.h: No such file or directory