Cannot compile Connect SE - connect/ioapi.h:135:51: error: expected initializer before ‘OF’

[ 11%] Building CXX object storage/connect/CMakeFiles/connect.dir/mycat.cc.o

In file included from /var/tmp/portage/dev-db/mariadb-10.0.29/work/mysql/storage/connect/unzip.h:55:0,

                 from /var/tmp/portage/dev-db/mariadb-10.0.29/work/mysql/storage/connect/tabzip.h:12,

                 from /var/tmp/portage/dev-db/mariadb-10.0.29/work/mysql/storage/connect/mycat.cc:99:

/var/tmp/portage/dev-db/mariadb-10.0.29/work/mysql/storage/connect/ioapi.h:135:51: error: expected initializer before ‘OF’

 typedef voidpf   (ZCALLBACK *open_file_func)      OF((voidpf opaque, const char* filename, int mode));