Installing Homebrew, libjpeg, and optipng for HTML5 Boilerplate build tool use - optimization

Question

Dipping my toe into command prompts.. totally lost.
I've installed Homebrew, and attempted to install libjpeg and optipng via brew install libjpeg optipngand have run into errors. I'm not sure how exactly to describe them.. so here's the code! I'm in Terminal on a Mac running OSX 10.6.7
Thank you SO much for the help.
1961:~ Daniel$ brew install libjpeg optipng
==> Downloading http://www.ijg.org/files/jpegsrc.v8c.tar.gz
File already downloaded and cached to /Users/Daniel/Library/Caches/Homebrew
==> ./configure --prefix=/usr/local/Cellar/jpeg/8c --disable-dependency-tracking
checking build system type... i386-apple-darwin10.7.3
checking host system type... i386-apple-darwin10.7.3
checking target system type... i386-apple-darwin10.7.3
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... ./install-sh -c -d
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... no
checking for style of include used by make... none
checking for gcc... /usr/bin/cc
checking whether the C compiler works... no
configure: error: in `/private/tmp/homebrew-jpeg-8c-42or/jpeg-8c':
configure: error: C compiler cannot create executables
See `config.log' for more details
==> Exit Status: 77
http://github.com/mxcl/homebrew/blob/master/Library/Formula/jpeg.rb#L11
==> Environment
HOMEBREW_VERSION: 0.8
HEAD: (none)
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
HOMEBREW_REPOSITORY: /usr/local
HOMEBREW_LIBRARY_PATH: /usr/local/Library/Homebrew
Hardware: 8-core 64-bit dunno
OS X: 10.6.7
Kernel Architecture: x86_64
Ruby: 1.8.7-174
/usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
Xcode:
GCC-4.0: N/A
GCC-4.2: N/A
LLVM: build 2335
MacPorts or Fink? false
X11 installed? true
==> Build Flags
CC: /usr/bin/cc
CXX: /usr/bin/c++
LD: /usr/bin/cc
CFLAGS: -O3 -w -pipe -arch i386 -arch x86_64
CXXFLAGS: -O3 -w -pipe -arch i386 -arch x86_64
LDFLAGS: -arch i386 -arch x86_64
MAKEFLAGS: -j8
Error: Failed executing: ./configure --prefix=/usr/local/Cellar/jpeg/8c --disable-dependency-tracking
Please report this bug: https://github.com/mxcl/homebrew/wiki/new-issue
These existing issues may help you:
https://github.com/mxcl/homebrew/issues/#issue/4442
It looks like an autotools configure failed.
Consider re-running the install with '-vd' to keep 'config.log' around:
brew install -vd jpeg
Gist 'config.log' and any error output when reporting an issue.
Remember to include your config information: brew --config
Also try:
`brew doctor` to check your setup for common problems.
`brew missing` to check installed packages for missing deps.
1961:~ Daniel$ brew doctor
We couldn't detect gcc 4.2.x. Some formulae require this compiler.
We couldn't detect gcc 4.0.x. Some formulae require this compiler.
/usr/bin is in your PATH before Homebrew's bin. This means that system-
provided programs will be used before Homebrew-provided ones. This is an
issue if you install, for instance, Python.
Consider editing your .bashrc to put:
/usr/local/bin
ahead of /usr/bin in your $PATH.
Some brews install binaries to sbin instead of bin, but Homebrew's
sbin was not found in your path.
Consider editing your .bashrc to add:
/usr/local/sbin
to $PATH.
"Git" was not found in your path.
Homebrew uses Git for several internal functions, and some formulae
use Git checkouts instead of stable tarballs.
You may want to do:
brew install git
You have an "autoconf" in your path blocking the system version at:
Custom autoconf in general and autoconf 2.66 in particular has issues
and will cause some Homebrew formulae to fail.
1961:~ Daniel$ brew install git
==> Downloading http://kernel.org/pub/software/scm/git/git-1.7.5.tar.bz2
######################################################################## 100.0%
==> make prefix=/usr/local/Cellar/git/1.7.5 install
==> Exit Status: 1
http://github.com/mxcl/homebrew/blob/master/Library/Formula/git.rb#L31
==> Environment
HOMEBREW_VERSION: 0.8
HEAD: (none)
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
HOMEBREW_REPOSITORY: /usr/local
HOMEBREW_LIBRARY_PATH: /usr/local/Library/Homebrew
Hardware: 8-core 64-bit dunno
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:
GCC-4.0: N/A
GCC-4.2: N/A
LLVM: build 2335
MacPorts or Fink? false
X11 installed? true
==> Build Flags
CC: /usr/bin/cc
CXX: /usr/bin/c++
LD: /usr/bin/cc
CFLAGS: -O3 -w -pipe
CXXFLAGS: -O3 -w -pipe
MAKEFLAGS: -j8
Error: Failed executing: make prefix=/usr/local/Cellar/git/1.7.5 install
Please report this bug: https://github.com/mxcl/homebrew/wiki/new-issue
Also try:
`brew doctor` to check your setup for common problems.
`brew missing` to check installed packages for missing deps.
1961:~ Daniel$ brew missing
1961:~ Daniel$ brew doctor
We couldn't detect gcc 4.2.x. Some formulae require this compiler.
We couldn't detect gcc 4.0.x. Some formulae require this compiler.
/usr/bin is in your PATH before Homebrew's bin. This means that system-
provided programs will be used before Homebrew-provided ones. This is an
issue if you install, for instance, Python.
Consider editing your .bashrc to put:
/usr/local/bin
ahead of /usr/bin in your $PATH.
Some brews install binaries to sbin instead of bin, but Homebrew's
sbin was not found in your path.
Consider editing your .bashrc to add:
/usr/local/sbin
to $PATH.
"Git" was not found in your path.
Homebrew uses Git for several internal functions, and some formulae
use Git checkouts instead of stable tarballs.
You may want to do:
brew install git
You have an "autoconf" in your path blocking the system version at:
Custom autoconf in general and autoconf 2.66 in particular has issues
and will cause some Homebrew formulae to fail.

Answer 1

Try downloading and installing the Xcode development suite: http://developer.apple.com/xcode/
That will provide gcc (complier) to build the software