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