This is the bytestring builder that is debuting in bytestring-0.10.4.0, which should be shipping with GHC 7.8, probably in late 2013. This builder has several nice simplifications and improvements, and more out-of-box functionality than the older blaze-builder.
Binary packages can be installed with the high-level tool pkgin (which can be installed with pkg_add) or pkg_add(1) (installed by default). The NetBSD packages collection is also designed to permit easy installation from source.
The pkg_admin audit command locates any installed package which has been mentioned in security advisories as having vulnerabilities.
Please note the vulnerabilities database might not be fully accurate, and not every bug is exploitable with every configuration.
Problem reports, updates or suggestions for this package should be reported with send-pr.