rb-mysql fails to build

[mrgibson@…]

---> Building rb-mysql with target all Error: Target com.apple.build returned: shell command "cd "/opt/local/var/db/dports/build/_opt_local_var_db_dports_sources_rsync.rsync.darwinports.org_dpupdate_dports_ruby_rb-mysql/work/mysql-ruby-2.7.1" && make all RUBY="/opt/local/bin/ruby -rvendor-specific"" returned error 2 Command output: gcc -I. -I. -I/opt/local/lib/ruby/1.8/powerpc-darwin8.7.0 -I. -DHAVE_MYSQL_SSL_SET -DHAVE_MYSQL_MYSQL_H -I/opt/local/include/mysql5 -I/usr/local/include -O -pipe -I/opt/local/include -fno-common -O -pipe -I/opt/local/include -fno-common -pipe -fno-common -c mysql.c mysql.c: In function `Init_mysql': mysql.c:2015: error: `ulong' undeclared (first use in this function) mysql.c:2015: error: (Each undeclared identifier is reported only once mysql.c:2015: error: for each function it appears in.) mysql.c:2015: error: parse error before numeric constant mysql.c:2018: error: parse error before numeric constant make: * [mysql.o] Error 1

Error: Status 1 encountered during processing.