title: ruby extconf.rb example
body: <p>I am following instructions to <a href="http://people.apache.org/~rooneg/talks/ruby-extensions/ruby-extensions.html" rel="nofollow">http://people.apache.org/~rooneg/talks/ruby-extensions/ruby-extensions.html</a> (page 6) and my make command is only returning <code>make: Nothing to be done for 'all'.</code></p>
  
  <p>Does anyone have any ideas?</p>
  
  <p>I am using ruby 1.9.2 and I'm on OSX 10.6.8</p>
  
  <pre><code>SHELL = /bin/sh
  
  #### Start of system configuration section. ####
  
  srcdir = .
  topdir = /Users/pcoder/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1
  hdrdir = /Users/pcoder/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1
  arch_hdrdir = /Users/pcoder/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/$(arch)
  VPATH = $(srcdir):$(arch_hdrdir)/ruby:$(hdrdir)/ruby
  prefix = $(DESTDIR)/Users/pcoder/.rvm/rubies/ruby-1.9.2-p290
  rubylibprefix = $(libdir)/$(RUBY_BASE_NAME)
  exec_prefix = $(prefix)
  vendorhdrdir = $(rubyhdrdir)/vendor_ruby
  sitehdrdir = $(rubyhdrdir)/site_ruby
  rubyhdrdir = $(includedir)/$(RUBY_BASE_NAME)-$(ruby_version)
  vendordir = $(rubylibprefix)/vendor_ruby
  sitedir = $(rubylibprefix)/site_ruby
  ridir = $(datarootdir)/$(RI_BASE_NAME)
  mandir = $(datarootdir)/man
  localedir = $(datarootdir)/locale
  libdir = $(exec_prefix)/lib
  psdir = $(docdir)
  pdfdir = $(docdir)
  dvidir = $(docdir)
  htmldir = $(docdir)
  infodir = $(datarootdir)/info
  docdir = $(datarootdir)/doc/$(PACKAGE)
  oldincludedir = $(DESTDIR)/usr/include
  includedir = $(prefix)/include
  localstatedir = $(prefix)/var
  sharedstatedir = $(prefix)/com
  sysconfdir = $(prefix)/etc
  datadir = $(datarootdir)
  datarootdir = $(prefix)/share
  libexecdir = $(exec_prefix)/libexec
  sbindir = $(exec_prefix)/sbin
  bindir = $(exec_prefix)/bin
  rubylibdir = $(rubylibprefix)/$(ruby_version)
  archdir = $(rubylibdir)/$(arch)
  sitelibdir = $(sitedir)/$(ruby_version)
  sitearchdir = $(sitelibdir)/$(sitearch)
  vendorlibdir = $(vendordir)/$(ruby_version)
  vendorarchdir = $(vendorlibdir)/$(sitearch)
  
  CC = gcc
  CXX = g++
  LIBRUBY = $(LIBRUBY_SO)
  LIBRUBY_A = lib$(RUBY_SO_NAME)-static.a
  LIBRUBYARG_SHARED = -l$(RUBY_SO_NAME)
  LIBRUBYARG_STATIC = -l$(RUBY_SO_NAME)-static
  OUTFLAG = -o 
  COUTFLAG = -o 
  
  RUBY_EXTCONF_H = 
  cflags   =  $(optflags) $(debugflags) $(warnflags)
  optflags = -O3
  debugflags = -ggdb
  warnflags = -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wshorten-64-to-32 -Wno-long-long
  CFLAGS   = -fno-common -isysroot /Developer/SDKs/MacOSX10.6.sdk -arch x86_64 -fno-common -pipe 
  INCFLAGS = -I. -I$(arch_hdrdir) -I$(hdrdir)/ruby/backward -I$(hdrdir) -I$(srcdir)
  DEFS     = 
  CPPFLAGS =  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE $(DEFS) $(cppflags)
  CXXFLAGS = $(CFLAGS) $(cxxflags)
  ldflags  = -L. -Wl,-syslibroot /Developer/SDKs/MacOSX10.6.sdk -arch x86_64
  dldflags = -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -Wl,-flat_namespace
  ARCH_FLAG = 
  DLDFLAGS = $(ldflags) $(dldflags)
  LDSHARED = $(CC) -dynamic -bundle
  LDSHAREDXX = $(CXX) -dynamic -bundle
  AR = ar
  EXEEXT = 
  
  RUBY_BASE_NAME = ruby
  RUBY_INSTALL_NAME = ruby
  RUBY_SO_NAME = ruby.1.9.1
  arch = x86_64-darwin10.7.0
  sitearch = $(arch)
  ruby_version = 1.9.1
  ruby = /Users/pcoder/.rvm/rubies/ruby-1.9.2-p290/bin/ruby
  RUBY = $(ruby)
  RM = rm -f
  RM_RF = $(RUBY) -run -e rm -- -rf
  RMDIRS = $(RUBY) -run -e rmdir -- -p
  MAKEDIRS = mkdir -p
  INSTALL = /usr/bin/install -c
  INSTALL_PROG = $(INSTALL) -m 0755
  INSTALL_DATA = $(INSTALL) -m 644
  COPY = cp
  
  #### End of system configuration section. ####
  
  preload = 
  
  libpath = . $(libdir)
  LIBPATH =  -L. -L$(libdir)
  DEFFILE = 
  
  CLEANFILES = mkmf.log
  DISTCLEANFILES = 
  DISTCLEANDIRS = 
  
  extout = 
  extout_prefix = 
  target_prefix = 
  LOCAL_LIBS = 
  LIBS = $(LIBRUBYARG_SHARED)  -lpthread -ldl -lobjc 
  SRCS = 
  OBJS = 
  TARGET = 
  DLLIB = 
  EXTSTATIC = 
  STATIC_LIB = 
  
  BINDIR        = $(bindir)
  RUBYCOMMONDIR = $(sitedir)$(target_prefix)
  RUBYLIBDIR    = $(sitelibdir)$(target_prefix)
  RUBYARCHDIR   = $(sitearchdir)$(target_prefix)
  HDRDIR        = $(rubyhdrdir)/ruby$(target_prefix)
  ARCHHDRDIR    = $(rubyhdrdir)/$(arch)/ruby$(target_prefix)
  
  TARGET_SO     = $(DLLIB)
  CLEANLIBS     = $(TARGET).bundle 
  CLEANOBJS     = *.o  *.bak
  
  all:    Makefile
  static: $(STATIC_LIB)
  .PHONY: all install static install-so install-rb
  .PHONY: clean clean-so clean-rb
  
  clean-rb-default::
  clean-rb::
  clean-so::
  clean: clean-so clean-rb-default clean-rb
          @-$(RM) $(CLEANLIBS) $(CLEANOBJS) $(CLEANFILES)
  
  distclean-rb-default::
  distclean-rb::
  distclean-so::
  distclean: clean distclean-so distclean-rb-default distclean-rb
          @-$(RM) Makefile $(RUBY_EXTCONF_H) conftest.* mkmf.log
          @-$(RM) core ruby$(EXEEXT) *~ $(DISTCLEANFILES)
          @-$(RMDIRS) $(DISTCLEANDIRS)
  
  realclean: distclean
  install: install-so install-rb
  
  install-so: Makefile
  install-rb: pre-install-rb install-rb-default
  install-rb-default: pre-install-rb-default
  pre-install-rb: Makefile
  pre-install-rb-default: Makefile
  
  site-install: site-install-so site-install-rb
  site-install-so: install-so
  site-install-rb: install-rb
  </code></pre>