brew install qrupdate

qrupdate.log

==> Downloading http://downloads.sourceforge.net/qrupdate/qrupdate-1.1.1.tar.gz
File already downloaded in /Users/martin/Library/Caches/Homebrew
/usr/bin/tar xf /Users/martin/Library/Caches/Homebrew/qrupdate-1.1.1.tar.gz
==> Using Homebrew-provided fortran compiler.
    This may be changed by setting the FC environment variable.
==> make -j 1 install
make -j 1 install 
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c caxcpy.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cch1dn.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cch1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cchdex.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cchinx.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cchshx.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cgqvec.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cqhqr.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cqr1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cqrdec.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cqrder.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cqrinc.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cqrinr.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cqrot.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cqrqh.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cqrshc.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c cqrtv1.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dch1dn.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dch1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dchdex.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dchinx.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dchshx.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dgqvec.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dqhqr.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dqr1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dqrdec.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dqrder.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dqrinc.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dqrinr.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dqrot.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dqrqh.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dqrshc.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dqrtv1.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sch1dn.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sch1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c schdex.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c schinx.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c schshx.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sgqvec.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sqhqr.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sqr1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sqrdec.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sqrder.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sqrinc.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sqrinr.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sqrot.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sqrqh.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sqrshc.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c sqrtv1.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zaxcpy.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zch1dn.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zch1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zchdex.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zchinx.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zchshx.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zgqvec.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zqhqr.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zqr1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zqrdec.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zqrder.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zqrinc.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zqrinr.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zqrot.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zqrqh.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zqrshc.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zqrtv1.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c clu1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dlu1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c slu1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zlu1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c clup1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c dlup1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c slup1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe -fPIC -c zlup1up.f
/usr/local/bin/gfortran -O3 -march=core2 -msse4.1 -w -pipe  -dynamiclib -o ../libqrupdate.dylib -install_name /usr/local/Cellar/qrupdate/1.1.1/lib/libqrupdate.1.dylib caxcpy.o cch1dn.o cch1up.o cchdex.o cchinx.o cchshx.o cgqvec.o cqhqr.o cqr1up.o cqrdec.o cqrder.o cqrinc.o cqrinr.o cqrot.o cqrqh.o cqrshc.o cqrtv1.o dch1dn.o dch1up.o dchdex.o dchinx.o dchshx.o dgqvec.o dqhqr.o dqr1up.o dqrdec.o dqrder.o dqrinc.o dqrinr.o dqrot.o dqrqh.o dqrshc.o dqrtv1.o sch1dn.o sch1up.o schdex.o schinx.o schshx.o sgqvec.o sqhqr.o sqr1up.o sqrdec.o sqrder.o sqrinc.o sqrinr.o sqrot.o sqrqh.o sqrshc.o sqrtv1.o zaxcpy.o zch1dn.o zch1up.o zchdex.o zchinx.o zchshx.o zgqvec.o zqhqr.o zqr1up.o zqrdec.o zqrder.o zqrinc.o zqrinr.o zqrot.o zqrqh.o zqrshc.o zqrtv1.o clu1up.o dlu1up.o slu1up.o zlu1up.o clup1up.o dlup1up.o slup1up.o zlup1up.o \
		-ldotwrp -framework Accelerate -ldotwrp -framework Accelerate
ld: library not found for -lgcc
make: *** [../libqrupdate.dylib] Error 1
==> Exit Status: 2
http://github.com/mxcl/homebrew/blob/master/Library/Formula/qrupdate.rb#L25
==> Environment
HOMEBREW_VERSION: 0.8
HEAD: 8c5f70195b667a70330223ba0219bb2333ee04ae
HOMEBREW_PREFIX: /usr/local
HOMEBREW_CELLAR: /usr/local/Cellar
HOMEBREW_REPOSITORY: /usr/local
HOMEBREW_LIBRARY_PATH: /usr/local/Library/Homebrew
Hardware: dual-core 64-bit penryn
OS X: 10.7.1
Kernel Architecture: x86_64
Ruby: 1.8.7-249
/usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
Xcode: 4.1
GCC-4.0: N/A 
GCC-4.2: build 5666 
LLVM: build 2335 
MacPorts or Fink? false
X11 installed? true
==> Build Flags
CC: /Developer/usr/bin/gcc-4.2
CXX: /Developer/usr/bin/g++-4.2
LD: /Developer/usr/bin/gcc-4.2
CFLAGS: -O3 -march=core2 -msse4.1 -w -pipe
CXXFLAGS: -O3 -march=core2 -msse4.1 -w -pipe
MAKEFLAGS: -j2

Error: Failed executing: make -j 1 install 
Please report this bug: https://github.com/mxcl/homebrew/wiki/Checklist-before-filing-a-new-issue

Also try:
  `brew doctor` to check your setup for common problems.
  `brew missing` to check installed packages for missing deps.