I'm trying to install PopSearch , but make is dying with the following error message : DirectoryParserUtilities.cc: In member function `std::string DirectoryParserUtilities::addEmail(const std::string&, const std::string&, const std::string&)': DirectoryParserUtilities.cc:188: `sleep' undeclared (first use this function) DirectoryParserUtilities.cc:188: (Each undeclared identifier is reported only once for each function it appears in.) make[2]: *** [DirectoryParserUtilities.lo] Error 1 make[2]: Leaving directory `/home/maven/popsearch/popsearch-0.3.0/src/build' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/maven/popsearch/popsearch-0.3.0/src' make: *** [all-recursive] Error 1 What am I missing? jeff mutonho