reporting weirdness in configure output

I was building postgresql via Macports (with the debug flag on) and I saw this output -- including a notice to report this to pgsql-bugs(at)postgresql(dot)org(dot) So I'm doing so!

---> Configuring postgresql91
DEBUG: Using compiler 'Mac OS X llvm-gcc 4.2'
DEBUG: Executing org.macports.configure (postgresql91)
DEBUG: Environment: CPATH='/opt/local/include' CFLAGS='-pipe -O2 -arch x86_64' CPPFLAGS='-I/opt/local/include -I/opt/local/include/ossp' CXXFLAGS='-pipe -O2 -arch x86_64' LIBRARY_PATH='/opt/local/lib' MACOSX_DEPLOYMENT_TARGET='10.7' CXX='/Developer/usr/bin/llvm-g++-4.2' CC_PRINT_OPTIONS_FILE='/opt/local/var/macports/build/_Users_singingwolfboy_Dropbox_ports_databases_postgresql91/postgresql91/work/.CC_PRINT_OPTIONS' F90FLAGS='-pipe -O2 -m64' LDFLAGS='-L/opt/local/lib -arch x86_64' FCFLAGS='-pipe -O2 -m64' OBJC='/Developer/usr/bin/llvm-gcc-4.2' INSTALL='/usr/bin/install -c' PYTHON='/opt/local/bin/python2.7' OBJCFLAGS='-pipe -O2 -arch x86_64' FFLAGS='-pipe -O2 -m64' CC_PRINT_OPTIONS='YES' CC='/Developer/usr/bin/llvm-gcc-4.2'
DEBUG: Assembled command: 'cd "/opt/local/var/macports/build/_Users_singingwolfboy_Dropbox_ports_databases_postgresql91/postgresql91/work/postgresql-9.1.1" && ./configure --prefix=/opt/local --sysconfdir=/opt/local/etc/postgresql91 --bindir=/opt/local/lib/postgresql91/bin --libdir=/opt/local/lib/postgresql91 --includedir=/opt/local/include/postgresql91 --datadir=/opt/local/share/postgresql91 --mandir=/opt/local/share/man --with-includes=/opt/local/include --with-libraries=/opt/local/lib --with-openssl --with-bonjour --with-readline --with-zlib --with-libxml --with-libxslt --enable-thread-safety --enable-integer-datetimes --with-ossp-uuid --with-python'
DEBUG: Executing command line: cd "/opt/local/var/macports/build/_Users_singingwolfboy_Dropbox_ports_databases_postgresql91/postgresql91/work/postgresql-9.1.1" && ./configure --prefix=/opt/local --sysconfdir=/opt/local/etc/postgresql91 --bindir=/opt/local/lib/postgresql91/bin --libdir=/opt/local/lib/postgresql91 --includedir=/opt/local/include/postgresql91 --datadir=/opt/local/share/postgresql91 --mandir=/opt/local/share/man --with-includes=/opt/local/include --with-libraries=/opt/local/lib --with-openssl --with-bonjour --with-readline --with-zlib --with-libxml --with-libxslt --enable-thread-safety --enable-integer-datetimes --with-ossp-uuid --with-python
checking build system type... x86_64-apple-darwin11.1.0
checking host system type... x86_64-apple-darwin11.1.0
checking which template to use... darwin
checking whether to build with 64-bit integer date/time support... yes
checking whether NLS is wanted... no
checking for default port number... 5432
checking for block size... 8kB
checking for segment size... 1GB
checking for WAL block size... 8kB
checking for WAL segment size... 16MB
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether /Developer/usr/bin/llvm-gcc-4.2 accepts -g... yes
checking for /Developer/usr/bin/llvm-gcc-4.2 option to accept ISO C89... none needed
checking whether /Developer/usr/bin/llvm-gcc-4.2 supports -Wdeclaration-after-statement... yes
checking whether /Developer/usr/bin/llvm-gcc-4.2 supports -Wendif-labels... yes
checking whether /Developer/usr/bin/llvm-gcc-4.2 supports -Wformat-security... yes
checking whether /Developer/usr/bin/llvm-gcc-4.2 supports -fno-strict-aliasing... yes
checking whether /Developer/usr/bin/llvm-gcc-4.2 supports -fwrapv... yes
checking whether the C compiler still works... yes
checking how to run the C preprocessor... /Developer/usr/bin/llvm-gcc-4.2 -E
checking allow thread-safe client libraries... yes
checking whether to build with Tcl... no
checking whether to build Perl modules... no
checking whether to build Python modules... yes
checking whether to build with GSSAPI support... no
checking whether to build with Kerberos 5 support... no
checking whether to build with PAM support... no
checking whether to build with LDAP support... no
checking whether to build with Bonjour support... yes
checking whether to build with OpenSSL support... yes
checking whether to build with SELinux support... no
checking for xml2-config... xml2-config
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for ld used by GCC... /Developer/usr/llvm-gcc-4.2/libexec/gcc/i686-apple-darwin11/4.2.1/ld
checking if the linker (/Developer/usr/llvm-gcc-4.2/libexec/gcc/i686-apple-darwin11/4.2.1/ld) is GNU ld... no
checking for ranlib... ranlib
checking for strip... strip
checking whether it is possible to strip libraries... no
checking for ar... ar
checking for tar... /usr/bin/tar
checking whether ln -s works... yes
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking for a thread-safe mkdir -p... config/install-sh -c -d
checking for bison... /opt/local/bin/bison
configure: using bison (GNU Bison) 2.5
checking for flex... /usr/bin/flex
configure: using flex 2.5.35
checking for perl... /opt/local/bin/perl
configure: using perl 5.12.3
checking for python... /opt/local/bin/python2.7
checking for Python distutils module... yes
checking Python configuration directory... /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config
checking how to link an embedded Python application... -L/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config -lpython2.7 -ldl -framework CoreFoundation
checking whether Python is compiled with thread support... yes
checking for main in -lm... yes
checking for library containing setproctitle... no
checking for library containing dlopen... none required
checking for library containing socket... none required
checking for library containing shl_load... no
checking for library containing getopt_long... none required
checking for library containing crypt... none required
checking for library containing fdatasync... none required
checking for library containing gethostbyname_r... no
checking for library containing shmget... none required
checking for library containing readline... -lreadline
checking for inflate in -lz... yes
checking for CRYPTO_new_ex_data in -lcrypto... yes
checking for SSL_library_init in -lssl... yes
checking for xmlSaveToBuffer in -lxml2... yes
checking for xsltCleanupGlobals in -lxslt... yes
checking for uuid_export in -lossp-uuid... no
checking for uuid_export in -luuid... yes
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking crypt.h usability... no
checking crypt.h presence... no
checking for crypt.h... no
checking dld.h usability... no
checking dld.h presence... no
checking for dld.h... no
checking fp_class.h usability... no
checking fp_class.h presence... no
checking for fp_class.h... no
checking getopt.h usability... yes
checking getopt.h presence... yes
checking for getopt.h... yes
checking ieeefp.h usability... no
checking ieeefp.h presence... no
checking for ieeefp.h... no
checking ifaddrs.h usability... yes
checking ifaddrs.h presence... yes
checking for ifaddrs.h... yes
checking langinfo.h usability... yes
checking langinfo.h presence... yes
checking for langinfo.h... yes
checking poll.h usability... yes
checking poll.h presence... yes
checking for poll.h... yes
checking pwd.h usability... yes
checking pwd.h presence... yes
checking for pwd.h... yes
checking sys/ioctl.h usability... yes
checking sys/ioctl.h presence... yes
checking for sys/ioctl.h... yes
checking sys/ipc.h usability... yes
checking sys/ipc.h presence... yes
checking for sys/ipc.h... yes
checking sys/poll.h usability... yes
checking sys/poll.h presence... yes
checking for sys/poll.h... yes
checking sys/pstat.h usability... no
checking sys/pstat.h presence... no
checking for sys/pstat.h... no
checking sys/resource.h usability... yes
checking sys/resource.h presence... yes
checking for sys/resource.h... yes
checking sys/select.h usability... yes
checking sys/select.h presence... yes
checking for sys/select.h... yes
checking sys/sem.h usability... yes
checking sys/sem.h presence... yes
checking for sys/sem.h... yes
checking sys/shm.h usability... yes
checking sys/shm.h presence... yes
checking for sys/shm.h... yes
checking sys/socket.h usability... yes
checking sys/socket.h presence... yes
checking for sys/socket.h... yes
checking sys/sockio.h usability... yes
checking sys/sockio.h presence... yes
checking for sys/sockio.h... yes
checking sys/tas.h usability... no
checking sys/tas.h presence... no
checking for sys/tas.h... no
checking sys/time.h usability... yes
checking sys/time.h presence... yes
checking for sys/time.h... yes
checking sys/ucred.h usability... yes
checking sys/ucred.h presence... yes
checking for sys/ucred.h... yes
checking sys/un.h usability... yes
checking sys/un.h presence... yes
checking for sys/un.h... yes
checking termios.h usability... yes
checking termios.h presence... yes
checking for termios.h... yes
checking ucred.h usability... no
checking ucred.h presence... no
checking for ucred.h... no
checking utime.h usability... yes
checking utime.h presence... yes
checking for utime.h... yes
checking wchar.h usability... yes
checking wchar.h presence... yes
checking for wchar.h... yes
checking wctype.h usability... yes
checking wctype.h presence... yes
checking for wctype.h... yes
checking kernel/OS.h usability... no
checking kernel/OS.h presence... no
checking for kernel/OS.h... no
checking kernel/image.h usability... no
checking kernel/image.h presence... no
checking for kernel/image.h... no
checking SupportDefs.h usability... no
checking SupportDefs.h presence... no
checking for SupportDefs.h... no
checking for net/if.h... yes
checking netinet/in.h usability... yes
checking netinet/in.h presence... yes
checking for netinet/in.h... yes
checking for netinet/tcp.h... yes
checking readline/readline.h usability... yes
checking readline/readline.h presence... yes
checking for readline/readline.h... yes
checking readline/history.h usability... yes
checking readline/history.h presence... yes
checking for readline/history.h... yes
checking zlib.h usability... yes
checking zlib.h presence... yes
checking for zlib.h... yes
checking openssl/ssl.h usability... yes
checking openssl/ssl.h presence... yes
checking for openssl/ssl.h... yes
checking openssl/err.h usability... yes
checking openssl/err.h presence... yes
checking for openssl/err.h... yes
checking for ERR_set_mark... yes
checking libxml/parser.h usability... yes
checking libxml/parser.h presence... yes
checking for libxml/parser.h... yes
checking libxslt/xslt.h usability... yes
checking libxslt/xslt.h presence... yes
checking for libxslt/xslt.h... yes
checking dns_sd.h usability... yes
checking dns_sd.h presence... yes
checking for dns_sd.h... yes
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
checking whether byte ordering is bigendian... universal
<snip>

The compilation finished successfully, in spite of this warning. This is on an early 2008 Macbook Pro, 2.4GHz Intel Core 2 Duo processor, running Mac OS X Lion 10.7.1. Please let me know if you need any more information.
-David Baumgold