brew install -vd lib

stehle@gaia:~$ brew install -vd libnet
==> Build Environment
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 -w -pipe
CXXFLAGS: -O3 -march=core2 -msse4 -w -pipe
MAKEFLAGS: -j8
==> Downloading https://github.com/sam-github/libnet/tarball/libnet-1.1.4
File already downloaded and cached to /Users/stehle/Library/Caches/Homebrew
/usr/bin/tar xf /Users/stehle/Library/Caches/Homebrew/libnet-1.1.4
==> ./autogen.sh
./autogen.sh 
+ trap '/bin/rm -fr autom4te.cache ;       echo '\''Failed to regenerate autoconf/automake stuff.'\''' 0 1 2 15
+ set -x
+ set -e
+ rm -fr autom4te.cache
+ aclocal -I .
+ glibtoolize --force
glibtoolize: putting auxiliary files in `.'.
glibtoolize: linking file `./ltmain.sh'
glibtoolize: Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.in and
glibtoolize: rerunning libtoolize, to keep the correct libtool macros in-tree.
glibtoolize: Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
+ autoheader
+ automake -a -c --foreign --force
configure.in:11: installing `./config.sub'
configure.in:13: installing `./install-sh'
configure.in:11: installing `./config.guess'
+ glibtoolize --force
glibtoolize: putting auxiliary files in `.'.
glibtoolize: linking file `./ltmain.sh'
glibtoolize: Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.in and
glibtoolize: rerunning libtoolize, to keep the correct libtool macros in-tree.
glibtoolize: Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
+ autoconf
+ rm -fr autom4te.cache
+ set +e
+ trap 'echo ./autogen.sh ok' 0 1 2 15
+ echo ./autogen.sh ok
./autogen.sh ok
==> ./configure --prefix=/usr/local/Cellar/libnet/1.1 --disable-debug --disable-dependency-tracking
./configure --prefix=/usr/local/Cellar/libnet/1.1 --disable-debug --disable-dependency-tracking
beginning autoconfiguration process for libnet-1.1.4 ...
configure: error: cannot run /bin/sh ./config.sub
Error: #<BuildError: Failure while executing: ./configure --prefix=/usr/local/Cellar/libnet/1.1 --disable-debug --disable-dependency-tracking>
/usr/local/Library/Homebrew/formula.rb:388:in `system'
/usr/local/Library/Formula/libnet.rb:16:in `install'
/usr/local/Library/Homebrew/install.rb:95:in `install'
/usr/local/Library/Homebrew/formula.rb:205:in `brew'
/usr/local/Library/Homebrew/formula.rb:449:in `stage'
/usr/local/Library/Homebrew/formula.rb:408:in `mktemp'
/usr/local/Library/Homebrew/formula.rb:447:in `stage'
/usr/local/Library/Homebrew/formula.rb:200:in `brew'
/usr/local/Library/Homebrew/install.rb:73:in `install'
/usr/local/Library/Homebrew/install.rb:38
/usr/local/Library/Formula/libnet.rb:9
==> Rescuing build...
It looks like an autotools configure failed.
Gist 'config.log' and any error output when reporting an issue.

When you exit this shell Homebrew will attempt to finalise the installation.
If nothing is installed or the shell exits with a non-zero error code,
Homebrew will abort. The installation prefix is:
/usr/local/Cellar/libnet/1.1