OSSP UUID present but cannot be compiled

While building 9.2.3 on OS X 10.8.2 today:

checking ossp/uuid.h usability... no
checking ossp/uuid.h presence... yes
configure: WARNING: ossp/uuid.h: present but cannot be compiled
configure: WARNING: ossp/uuid.h: check for missing prerequisite headers?
configure: WARNING: ossp/uuid.h: see the Autoconf documentation
configure: WARNING: ossp/uuid.h: section "Present But Cannot Be Compiled"
configure: WARNING: ossp/uuid.h: proceeding with the preprocessor's result
configure: WARNING: ossp/uuid.h: in the future, the compiler will take precedence
configure: WARNING: ## ---------------------------------------- ##
configure: WARNING: ## Report this to pgsql-bugs(at)postgresql(dot)org ##
configure: WARNING: ## ---------------------------------------- ##
checking for ossp/uuid.h... yes

So you asked for it. Here's how I configured Postgres:

./configure --with-bonjour --with-perl PERL=$PERL \
--with-openssl --with-pam --with-krb5 --with-libxml \
--with-ossp-uuid --with-includes=/usr/local/include \
--enable-integer-datetimes --with-zlib \
--with-libs=/usr/local/lib

And here's how I configured OSSP UUID:

./configure --prefix=/usr/local --with-perl=/usr/local/bin/perl \
--includedir=/usr/local/include/ossp

I think I have reported this before. Maybe it's not worth worrying about? I seem to be able to install the uuid-ossp extension and it works. So Ignore?

Thanks,

David