The 14.1 SlackBuild for Postfix 2.11.1 has single quotes enclosing ${LIBDIRSUFFIX} in two places. The single quotes should be double quotes. Here are the two lines: SASLLIBS='-L/usr/lib${LIBDIRSUFFIX}/sasl2 -lsasl2' ;; DBLIBS='-L/usr/lib${LIBDIRSUFFIX}/mysql -lmysqlclient -lz -lm' ;; Thanks, Duane