brew install yasm --verbose

gistfile1.txt

==> Downloading http://tortall.net/projects/yasm/releases/yasm-1.2.0.tar.gz
Already downloaded: /Library/Caches/Homebrew/yasm-1.2.0.tar.gz
/usr/bin/tar xf /Library/Caches/Homebrew/yasm-1.2.0.tar.gz
==> ./configure --disable-debug --prefix=/usr/local/Cellar/yasm/1.2.0
./configure --disable-debug --prefix=/usr/local/Cellar/yasm/1.2.0
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... config/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)... yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking for style of include used by make... GNU
checking for gcc... cc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether cc accepts -g... yes
checking for cc option to accept ISO C89... none needed
checking dependency style of cc... gcc3
checking how to run the C preprocessor... cc -E
checking for cc option to accept ISO C99... none needed
checking for cc option to accept ISO Standard C... (cached) none needed
checking whether ln -s works... yes
checking for ar... ar
checking for ranlib... ranlib
checking for xmlto... no
configure: WARNING: xmlto not found, manpages will not be rebuilt.
checking if malloc debugging is wanted... no
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for strings.h... (cached) yes
checking libgen.h usability... yes
checking libgen.h presence... yes
checking for libgen.h... yes
checking for unistd.h... (cached) yes
checking direct.h usability... no
checking direct.h presence... no
checking for direct.h... no
checking for sys/stat.h... (cached) yes
checking for an ANSI C-conforming const... yes
checking for inline... inline
checking for function prototypes... yes
checking for size_t... yes
checking for stdint types... stdint.h (shortcircuit)
make use of stdint.h in libyasm-stdint.h (assuming C99 compatible system)
checking for abort... yes
checking for toascii... yes
checking for vsnprintf... yes
checking for strsep... yes
checking for mergesort... yes
checking for getcwd... yes
checking for popen... yes
checking for ftruncate... yes
checking for strcasecmp... yes
checking for strncasecmp... yes
checking for stricmp... no
checking for _stricmp... no
checking for strcmpi... no
checking whether NLS is requested... yes
checking for msgfmt... no
checking for gmsgfmt... :
checking for xgettext... no
checking for msgmerge... no
checking build system type... i686-apple-darwin12.2.0
checking host system type... i686-apple-darwin12.2.0
checking for ld used by GCC... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... no
checking for shared library run path origin... done
checking for CFPreferencesCopyAppValue... yes
checking for CFLocaleCopyCurrent... yes
checking for GNU gettext in libc... no
checking for iconv... yes
checking for working iconv... yes
checking how to link with libiconv... -liconv
checking for GNU gettext in libintl... no
checking whether to use NLS... no
checking for GNU C Library... no
configure: Checking for Python
checking for a Python interpreter with version >= 2.4... python
checking for python... /usr/local/opt/python/bin/python
checking for python version... 2.7
checking for python platform... darwin
checking for python script directory... ${prefix}/lib/python2.7/site-packages
checking for python extension module directory... ${exec_prefix}/lib/python2.7/site-packages
configure: creating ./config.status
config.status: creating Makefile
config.status: creating po/Makefile.in
config.status: creating config.h
config.status: executing depfiles commands
config.status: executing libyasm-stdint.h commands
config.status: creating libyasm-stdint.h : _YASM_LIBYASM_STDINT_H
config.status: executing po-directories commands
config.status: creating po/POTFILES
config.status: creating po/Makefile
==> make install
make install 
cc  -I.  \
    -c -o genperf.o `test -f tools/genperf/genperf.c || echo './'`tools/genperf/genperf.c
cc  -I.  \
	  -c -o gp-perfect.o `test -f tools/genperf/perfect.c || echo './'`tools/genperf/perfect.c
cc  -I.  \
	  -c -o gp-phash.o `test -f libyasm/phash.c || echo './'`libyasm/phash.c
cc  -I.  \
	  -c -o gp-xmalloc.o `test -f libyasm/xmalloc.c || echo './'`libyasm/xmalloc.c
cc  -I.  \
	  -c -o gp-xstrdup.o `test -f libyasm/xstrdup.c || echo './'`libyasm/xstrdup.c
cc  -I.  \
	  -c -o re2c-main.o `test -f tools/re2c/main.c || echo './'`tools/re2c/main.c
cc  -I.  \
	  -c -o re2c-code.o `test -f tools/re2c/code.c || echo './'`tools/re2c/code.c
cc  -I.  \
	  -c -o re2c-dfa.o `test -f tools/re2c/dfa.c || echo './'`tools/re2c/dfa.c
cc  -I.  \
	  -c -o re2c-parser.o `test -f tools/re2c/parser.c || echo './'`tools/re2c/parser.c
cc  -I.  \
	  -c -o re2c-actions.o `test -f tools/re2c/actions.c || echo './'`tools/re2c/actions.c
cc  -I.  \
	  -c -o re2c-scanner.o `test -f tools/re2c/scanner.c || echo './'`tools/re2c/scanner.c
cc  -I.  \
	  -c -o re2c-mbo_getopt.o `test -f tools/re2c/mbo_getopt.c || echo './'`tools/re2c/mbo_getopt.c
cc  -I.  \
	  -c -o re2c-substr.o `test -f tools/re2c/substr.c || echo './'`tools/re2c/substr.c
cc  -I.  \
	  -c -o re2c-translate.o `test -f tools/re2c/translate.c || echo './'`tools/re2c/translate.c
cc  -I.  \
	  -c -o genmacro.o `test -f tools/genmacro/genmacro.c || echo './'`tools/genmacro/genmacro.c
cc -I.  -c -o genversion.o `test -f modules/preprocs/nasm/genversion.c || echo './'`modules/preprocs/nasm/genversion.c
cc -I.  -c -o genstring.o `test -f genstring.c || echo './'`genstring.c
cc -o genperf  genperf.o gp-perfect.o gp-phash.o gp-xmalloc.o gp-xstrdup.o 
cc -o re2c  re2c-main.o re2c-code.o re2c-dfa.o re2c-parser.o re2c-actions.o re2c-scanner.o re2c-mbo_getopt.o re2c-substr.o re2c-translate.o 
Undefined symbols for architecture x86_64:
  "_N_", referenced from:
      _def_xmalloc in gp-xmalloc.o
      _def_xcalloc in gp-xmalloc.o
      _def_xrealloc in gp-xmalloc.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [genperf] Error 1
make: *** Waiting for unfinished jobs....
==> Configuration
HOMEBREW_VERSION: 0.9.3
HEAD: 30dc1bea9adae95d5c19045ffc3d67cc8b1e1eea
CPU: dual-core 64-bit penryn
OS X: 10.8.2-x86_64
Xcode: 4.5.2
CLT: 4.5.0.0.1.1249367152
X11: 2.7.4 => /opt/X11
==> ENV
CC: cc
CXX: c++
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_PATH: /usr/local/lib/pkgconfig:/usr/local/Library/ENV/pkgconfig/mountain_lion
ACLOCAL_PATH: /usr/local/share/aclocal
OBJC: cc
PATH: /usr/local/Library/ENV/4.3:/usr/local/opt/python/bin:/usr/bin:/bin:/usr/sbin:/sbin

Error: yasm did not build
Logs:       /Users/ben/Library/Logs/Homebrew/yasm/config.log

These open issues may also help:
    https://github.com/mxcl/homebrew/issues/16244