Brew installing x86_64 (64-bit) versions on MAC OS X Mavericks - x86-64

Question

First of all, I know there are similar questions but I'm having no luck, so decided to ask a new one myself.
I'm trying to brew install the 64-bit version pjsip, but I always end up with the i386 version.
I've seen people whose brew --env yields CFLAGS and CXXFLAGS, but for some reason, mine doesn't, so I have no clue where to set the correct architecture.
$ brew --env
HOMEBREW_CC: clang
HOMEBREW_CXX: clang++
MAKEFLAGS: -j2
CMAKE_PREFIX_PATH: /usr/local
CMAKE_INCLUDE_PATH: /usr/include/libxml2:/System/Library/Frameworks/OpenGL.framework/Versions/Current/Headers
CMAKE_LIBRARY_PATH: /System/Library/Frameworks/OpenGL.framework/Versions/Current/Libraries
PKG_CONFIG_LIBDIR: /usr/lib/pkgconfig:/usr/local/Library/ENV/pkgconfig/10.9
ACLOCAL_PATH: /usr/local/share/aclocal
PATH: /usr/local/Library/ENV/4.3:/usr/bin:/bin:/usr/sbin:/sbin
$ brew --config
HOMEBREW_VERSION: 0.9.5
ORIGIN: https://github.com/mxcl/homebrew
HEAD: 8c19edbdd364200fb2cc9276b0bc49ec4cb98aae
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
CPU: dual-core 64-bit penryn
OS X: 10.9-x86_64
Xcode: 5.0.1
CLT: 5.0.1.0.1.1382131676
GCC-4.0: build 5494
Clang: 5.0 build 500
X11: 2.7.4 => /opt/X11
System Ruby: 1.8.7-358
Perl: /usr/bin/perl
Python: /Library/Frameworks/Python.framework/Versions/2.7/bin/python => /Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7
Ruby: /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
I've seen people referring to the version of ruby and I'm not sure it matters, but mine is a Universal build:
$ file /usr/bin/ruby
/usr/bin/ruby: Mach-O universal binary with 2 architectures
/usr/bin/ruby (for architecture x86_64): Mach-O 64-bit executable x86_64
/usr/bin/ruby (for architecture i386): Mach-O executable i386

Answer 1

brew install -v pjsip shows:
==> ./configure --prefix=/usr/local/Cellar/pjsip/2.1
checking build system type... i386-apple-darwin13.0.0
checking host system type... i386-apple-darwin13.0.0
checking target system type... i386-apple-darwin13.0.0
Somehow it thinks that we're on a 64bit system, which is odd, as I'm definitely running a 64bit OS. Checking through the arch-host-OS detection code shows that is uses arch to determine the architecture. For some odd reason, this is reporting that we're a 32bit system:
$ arch
i386
While under linux:
$ arch
x86_64
The quick solution is to do a brew edit pjsip, and change line 22 to read:
system "./configure", "--prefix=#{prefix}", "--host=x86_64-apple-darwin13.0.0", "--target=x86_64-apple-darwin13.0.0", "--host=x86_64-apple-darwin13.0.0"
then perform a brew install pjsip, and it looks like you have 64bit pjsip.
Probably fixable with an edit of the recipe to get the proper arch, rather than just passing in the --build, --host and --target options.