title: Cannot compile ruby 1.9.3
body: <p>When I run</p>
  
  <pre><code>rvm install 1.9.3 --with-gcc=clang
  </code></pre>
  
  <p>on Mac OSX Lion, ruby does not compile, and I get the following error in (.rvm/log/ruby-1.9.3-p374/make.log)</p>
  
  <pre><code>[2013-01-29 16:31:05] make
  CC = clang
  LD = ld
  LDSHARED = clang -dynamic -bundle
  CFLAGS = -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Werror=pointer-arith -Werror=write-strings -Werror=declaration-after-statement -Werror=shorten-64-to-32 -Werror=implicit-function-declaration  -pipe 
  XCFLAGS = -include ruby/config.h -include ruby/missing.h -fvisibility=hidden -DRUBY_EXPORT
  CPPFLAGS = -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -I/Users/will/.rvm/usr/include -I. -I.ext/include/x86_64-darwin12.2.1 -I./include -I.
  DLDFLAGS = -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -Wl,-flat_namespace  
  SOLIBS = 
  compiling regparse.c
  regparse.c:582:15: error: implicit conversion loses integer precision: 'st_index_t' (aka 'unsigned long') to 'int' [-Werror,-Wshorten-64-to-32]
  return t-&gt;num_entries;
  ~~~~~~ ~~~^~~~~~~~~~~
  1 error generated.
  make: *** [regparse.o] Error 1
  </code></pre>
  
  <p>How can I get ruby 1.9.3 to install on Lion?</p>