groonga: It looks like upstream fixed the build with clang in a version since it was blacklisted, removed blacklisting.
--- trunk/dports/databases/groonga/Portfile 2013-08-30 20:30:43 UTC (rev 110392)
+++ trunk/dports/databases/groonga/Portfile 2013-08-30 20:33:58 UTC (rev 110393)
@@ -34,8 +34,6 @@
port:pcre \
port:kytea
-compiler.blacklist clang
-
livecheck.type regex
livecheck.url [lindex ${master_sites} 0]
livecheck.regex {groonga-([0-9.-]+)\.tar}