Installation failure...

[solocrongroup]

Error portion of log:

checking for nroff... /usr/bin/nroff
.ext/include/x86_64-darwin12.2.0/ruby/config.h unchanged
ruby library version = 1.9.1
configure: creating ./config.status
config.status: creating Makefile
config.status: creating ruby-1.9.pc
configure: WARNING: unrecognized options: --with-libyaml-dir
CC = gcc
LD = ld
LDSHARED = gcc -dynamiclib
CFLAGS = -O3 -ggdb -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 -fno-common -pipe
XCFLAGS = -include ruby/config.h -include ruby/missing.h -fvisibility=hidden -DRUBY_EXPORT
CPPFLAGS = -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I. -I.ext/include/x86_64-darwin12.2.0 -I./include -I.
DLDFLAGS = -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -Wl,-flat_namespace -install_name @executable_path/../lib/libruby.1.9.1.dylib -current_version 1.9.1 -compatibility_version 1.9.1 -Wl,-unexported_symbol,Init* -Wl,-unexported_symbol,threadptr -Wl,-u,_objc_msgSend
SOLIBS =
linking miniruby
rbconfig.rb unchanged
generating enc.mk
generating prelude.c
compiling prelude.c
linking static-library libruby.1.9.1-static.a
linking shared-library libruby.1.9.1.dylib
generating encdb.h
encdb.h unchanged
making enc
make[1]: Nothing to be done for enc'. making srcs under enc make[1]: Nothing to be done forsrcs'.
generating transdb.h
transdb.h unchanged
making trans
make[1]: Nothing to be done for ./enc/trans'. making encs installing default bug libraries installing default resize libraries installing default bug libraries installing default bug libraries installing default funcall libraries installing default dot.dot libraries installing default old_thread_select libraries installing default numhash libraries installing default string libraries installing default wait_for_single_fd libraries make[2]: Nothing to be done forall'.
installing default bigdecimal libraries
installing default continuation libraries
installing default coverage libraries
installing default curses libraries
installing default date_core libraries
installing default dbm libraries
installing digest libraries
installing default digest libraries
installing default bubblebabble libraries
installing default md5 libraries
installing default rmd160 libraries
installing default sha1 libraries
installing default sha2 libraries
installing dl libraries
installing default dl libraries
installing default callback libraries
make[2]: Nothing to be done for all'. installing default etc libraries installing default fcntl libraries installing default fiber libraries installing default fiddle libraries make[2]: Nothing to be done forall'.
installing default iconv libraries
installing default console libraries
installing default nonblock libraries
installing default wait libraries
installing default libraries
installing default generator libraries
installing default parser libraries
installing default complex libraries
installing default rational libraries
installing default nkf libraries
installing default objspace libraries
installing default openssl libraries
installing default pathname libraries
installing default psych libraries
installing default pty libraries
installing default cparse libraries
compiling readline.c
readline.c: In function 'username_completion_proc_call':
readline.c:1499: error: 'username_completion_function' undeclared (first use in this function)
readline.c:1499: error: (Each undeclared identifier is reported only once
readline.c:1499: error: for each function it appears in.)
make[2]: *** [readline.o] Error 1
make[1]: *** [ext/readline/all] Error 2
make: *** [build-ext] Error 2

[oscardelben]

This may help, in particular the part about adding ARCHFLAGS.

http://stackoverflow.com/questions/6970545/make-error-installing-ruby-1-9-2-with-rvm-and-readline-under-osx-lion