postgresql 9.0.4 source compilation issue on OSX

I am installing postgresql using homebrew on OSX. I am getting strange
compilation errors. Googling did not help me in getting any lead to the
resolution. When I compile it on a standalone basis (without using brew) I
still get the same error. Compiling 9.1beta1 source package also gave me the
same set of errors.

Any lead/help will be highly appreciated.

- Bhavin

Here's the brief gist of errors along with environment details and here's
the full error log <https://gist.github.com/1014987>.

make -C ../../../src/port all
/usr/bin/cc -O3 -march=core2 -msse4.1 -w -pipe -I/usr/include/libxml2
-I/usr/local/Cellar/ossp-uuid/1.6.2/include -Wall -Wmissing-prototypes
-Wpointer-arith -Wdeclaration-after-statement -Wendif-labels
-fno-strict-aliasing -fwrapv -arch x86_64 -I../../../src/include
-I/usr/local/Cellar/readline/6.2.1/include -I/usr/include/libxml2
-I../../../src/port '-DHOST_TUPLE="x86_64-apple-darwin10.7.0"'
'-DMAKEPROG="make"' '-DSHELLPROG="/bin/sh"' '-DDLSUFFIX=".so"' -c -o
pg_regress.o pg_regress.c
make[3]: Nothing to be done for `all'.
/usr/bin/cc -O3 -march=core2 -msse4.1 -w -pipe -I/usr/include/libxml2
-I/usr/local/Cellar/ossp-uuid/1.6.2/include -Wall -Wmissing-prototypes
-Wpointer-arith -Wdeclaration-after-statement -Wendif-labels
-fno-strict-aliasing -fwrapv -arch x86_64 -I../../../src/include
-I/usr/local/Cellar/readline/6.2.1/include -I/usr/include/libxml2 -c
-o pg_regress_main.o pg_regress_main.c
/usr/bin/cc -O3 -march=core2 -msse4.1 -w -pipe -I/usr/include/libxml2
-I/usr/local/Cellar/ossp-uuid/1.6.2/include -Wall -Wmissing-prototypes
-Wpointer-arith -Wdeclaration-after-statement -Wendif-labels
-fno-strict-aliasing -fwrapv -arch x86_64 -I../../../src/include
-I/usr/local/Cellar/readline/6.2.1/include -I/usr/include/libxml2 -c
-o regress.o regress.c
make -C ../../../contrib/spi refint.so
make[3]: pg_config: Command not found
make[3]: *** No rule to make target `refint.so'. Stop.
make[2]: *** [../../../contrib/spi/refint.so] Error 2
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [install] Error 2
make: *** [install] Error 2
==> Exit Status: 2
http://github.com/mxcl/homebrew/blob/master/Library/Formula/postgresql.rb#L55
==> Environment
HOMEBREW_VERSION: 0.8
HEAD: 3c7142478ab167c79e0d30a5d1a580ce6bce596f
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
HOMEBREW_REPOSITORY: /usr/local
HOMEBREW_LIBRARY_PATH: /usr/local/Library/Homebrew
Hardware: dual-core 64-bit penryn
OS X: 10.6.7
Kernel Architecture: x86_64
Ruby: 1.8.7-174
/usr/bin/ruby =>
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
Xcode: 3.2.6
GCC-4.0: build 5494
GCC-4.2: build 5666
LLVM: build 2335
MacPorts or Fink? false
X11 installed? true
==> Build Flags
CC: /usr/bin/cc => /usr/bin/gcc-4.2
CXX: /usr/bin/c++ => /usr/bin/c++-4.2
LD: /usr/bin/cc => /usr/bin/gcc-4.2
CFLAGS: -O3 -march=core2 -msse4.1 -w -pipe -I/usr/include/libxml2
-I/usr/local/Cellar/ossp-uuid/1.6.2/include
CXXFLAGS: -O3 -march=core2 -msse4.1 -w -pipe -I/usr/include/libxml2
CPPFLAGS: -I/usr/local/Cellar/readline/6.2.1/include
LDFLAGS: -L/usr/local/Cellar/readline/6.2.1/lib
-L/usr/local/Cellar/ossp-uuid/1.6.2/lib
MAKEFLAGS: -j2
PKG_CONFIG_PATH: /usr/local/Cellar/readline/6.2.1/lib/pkgconfig