trying to install git on lion...

gistfile1.txt

==> make prefix=/usr/local/Cellar/git/1.7.9.1 CC=/Applications/Xcode.app/Content
GIT_VERSION = 1.7.9.1
    * new build flags or prefix
    * new link flags
./generate-cmdlist.sh > common-cmds.h+ && mv common-cmds.h+ common-cmds.h
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -o hex.o -c -MF ./.depend/hex.o.d -MMD -MP  -Os -w -pipe -march=native -I. -DUSE_ST_TIMESPEC -DNO_GETTEXT  -DHAVE_DEV_TTY -DSHA1_HEADER='<openssl/sha.h>'  -DNO_MEMMEM  hex.c
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -o ident.o -c -MF ./.depend/ident.o.d -MMD -MP  -Os -w -pipe -march=native -I. -DUSE_ST_TIMESPEC -DNO_GETTEXT  -DHAVE_DEV_TTY -DSHA1_HEADER='<openssl/sha.h>'  -DNO_MEMMEM  ident.c
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -o kwset.o -c -MF ./.depend/kwset.o.d -MMD -MP  -Os -w -pipe -march=native -I. -DUSE_ST_TIMESPEC -DNO_GETTEXT  -DHAVE_DEV_TTY -DSHA1_HEADER='<openssl/sha.h>'  -DNO_MEMMEM  kwset.c
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -o levenshtein.o -c -MF ./.depend/levenshtein.o.d -MMD -MP  -Os -w -pipe -march=native -I. -DUSE_ST_TIMESPEC -DNO_GETTEXT  -DHAVE_DEV_TTY -DSHA1_HEADER='<openssl/sha.h>'  -DNO_MEMMEM  levenshtein.c
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -o list-objects.o -c -MF ./.depend/list-objects.o.d -MMD -MP  -Os -w -pipe -march=native -I. -DUSE_ST_TIMESPEC -DNO_GETTEXT  -DHAVE_DEV_TTY -DSHA1_HEADER='<openssl/sha.h>'  -DNO_MEMMEM  list-objects.c
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -o ll-merge.o -c -MF ./.depend/ll-merge.o.d -MMD -MP  -Os -w -pipe -march=native -I. -DUSE_ST_TIMESPEC -DNO_GETTEXT  -DHAVE_DEV_TTY -DSHA1_HEADER='<openssl/sha.h>'  -DNO_MEMMEM  ll-merge.c
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -o lockfile.o -c -MF ./.depend/lockfile.o.d -MMD -MP  -Os -w -pipe -march=native -I. -DUSE_ST_TIMESPEC -DNO_GETTEXT  -DHAVE_DEV_TTY -DSHA1_HEADER='<openssl/sha.h>'  -DNO_MEMMEM  lockfile.c
In file included from levenshtein.c:1:
In file included from ./cache.h:4:
./git-compat-util.h:93In file included from In file included from ident.c:8In file included from In file included from :
In file included from ll-merge.clist-objects.cIn file included from lockfile.c:In file included from :./cache.h::4kwset.c::71:
10:
: fatal error: hex.c:41./git-compat-util.h:
In file included from ./cache.h::
:
4'unistd.h' file not foundIn file included from In file included from ./cache.h:
4./cache.h::934:
./git-compat-util.hIn file included from :
:
./git-compat-util.h:./cache.h::93:10: ./git-compat-util.h4fatal error: ::
9310:'unistd.h' file not found: :fatal error: 10: fatal error: 'unistd.h' file not found
'unistd.h' file not found./git-compat-util.h
:93:1093:37
 fatal error: :'unistd.h' file not found:
10
In file included from ./cache.h:: 4fatal error: 'unistd.h' file not found
:
./git-compat-util.h:93:10: fatal error: 'unistd.h' file not found
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -o log-tree.o -c -MF ./.depend/log-tree.o.d -MMD -MP  -Os -w -pipe -march=native -I. -DUSE_ST_TIMESPEC -DNO_GETTEXT  -DHAVE_DEV_TTY -DSHA1_HEADER='<openssl/sha.h>'  -DNO_MEMMEM  log-tree.c
#include <unistd.h>#include <unistd.h>
         ^
#include <unistd.h>
         ^
#include <unistd.h>
         ^

#include <unistd.h>         ^

         ^
#include <unistd.h>
#include <unistd.h>
         ^
         ^
In file included from log-tree.c:1:
In file included from ./cache.h:4:
./git-compat-util.h:93:10: fatal error: 'unistd.h' file not found
#include <unistd.h>
         ^
1 error generated.
make: *** [hex.o] Error 1
make: *** Waiting for unfinished jobs....
1 error generated.
1make: *** [levenshtein.o] Error 1 error generated.

make: *** [lockfile.o] Error 1
1 error generated.
make: *** [ident.o] Error 1
1 error generated.
make: *** [ll-merge.o] Error 1
1 error generated.
1 error generated.
make: *** [list-objects.o] Error 1
make: *** [kwset.o] Error 1
1 error generated.
make: *** [log-tree.o] Error 1
==> Exit Status: 2
http://github.com/mxcl/homebrew/blob/master/Library/Formula/git.rb#L47
==> Environment
HOMEBREW_VERSION: 0.8.1
HEAD: (none)
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
Hardware: 8-core 64-bit sandybridge
OS X: 10.7.3
Kernel Architecture: x86_64
Xcode: 4.2
GCC-4.0: N/A
GCC-4.2: N/A
LLVM: build 2336
Clang: N/A
MacPorts or Fink? false
X11 installed? true
System Ruby: 1.8.7-249
/usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
Which Perl:   /usr/bin/perl
Which Python: /usr/bin/python
Which Ruby:   /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
==> Build Flags
CC: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
CXX: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ => /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
LD: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
CFLAGS: -Os -w -pipe -march=native
CXXFLAGS: -Os -w -pipe -march=native
MAKEFLAGS: -j8

Error: Failed executing: make prefix=/usr/local/Cellar/git/1.7.9.1 CC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang CFLAGS=-Os\ -w\ -pipe\ -march=native LDFLAGS= install
These existing issues may help you:
    https://github.com/mxcl/homebrew/issues/8977
    https://github.com/mxcl/homebrew/issues/9023
    https://github.com/mxcl/homebrew/issues/9618
    https://github.com/mxcl/homebrew/issues/10081
    https://github.com/mxcl/homebrew/issues/10225
    https://github.com/mxcl/homebrew/issues/10301
Otherwise, please report the bug:
    https://github.com/mxcl/homebrew/wiki/checklist-before-filing-a-new-issue

Tried 'brew install git' today (2/20/2012) and received the same error message.

Solution: Download XCode in the App Store, Install it. Open the XCode preferences > Downloads. Click on 'Install' next to the command line tools.

@zeisss thank you! I was pulling my hair out all night trying to figure this out. All you used to have to do is download Xcode and you were good to go. Not sure what has changed since December and now, February...

@awellis13: No problem. I searched long for this solution as well, so I left this hint somewhere for others to find. Seems like that worked :)

This should be added to the emergency instructions provided when the command 'brew install git' fails.

Thanks for this.

Thank you very much!

Why did they change this? Git came by default in the previous version... Anyway, thanks!

They repackaged Xcode as an App instead of a standalone installation into /Developer. Probably easy on their end to maintain. Wish command line tools were installed by default though.

Thanks ! Really helpful

Thanks, ran into this problem just now and found this gist via Google. :)

Many thanks yet again...the command-line tools was a problem for me too.