compilation fails on OpenBSD: `NS_DEFAULTPORT' undeclared

Agent does not compile on OpenBSD 3.9:

$ make install
...
net.c: In function `dns_query':
net.c:430: error: `NS_DEFAULTPORT' undeclared (first use in this function)
net.c:430: error: (Each undeclared identifier is reported only once
net.c:430: error: for each function it appears in.)

Running bootstrap.sh also has complains of its own:

$ ./bootstrap.sh
...
src/Makefile.am:41: directory should not contain `/'
src/Makefile.am:41: directory should not contain `/'

The compilation problem seems to be present in trunk only.