Cannot compile ruby 1.9.3

Question

When I run

rvm install 1.9.3 --with-gcc=clang

on Mac OSX Lion, ruby does not compile, and I get the following error in (.rvm/log/ruby-1.9.3-p374/make.log)

[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->num_entries;
~~~~~~ ~~~^~~~~~~~~~~
1 error generated.
make: *** [regparse.o] Error 1

How can I get ruby 1.9.3 to install on Lion?

Answer 1

With Xcode 4.6 I was also getting this problem. I installed the command line tools which made gcc available in /usr/bin/gcc.

I managed to get it to work using:

rvm install 1.9.3 --with-gcc=gcc

NB. I dont have homebrew installed.