xxxx:~ yyy$ rvm install 1.9.2
Installing Ruby from source to: /Volumes/HDD/Users/tim/.rvm/rubies/ruby-1.9.2-p180, this may take a while depending on your cpu(s)...

ruby-1.9.2-p180 - #fetching 
ruby-1.9.2-p180 - #extracted to /Volumes/HDD/Users/tim/.rvm/src/ruby-1.9.2-p180 (already extracted)
ruby-1.9.2-p180 - #configuring 
ruby-1.9.2-p180 - #compiling 
ERROR: Error running 'make ', please read /Volumes/HDD/Users/tim/.rvm/log/ruby-1.9.2-p180/make.log
ERROR: There has been an error while running make. Halting the installation.


xxxx:~ yyy$ less /Volumes/HDD/Users/yyy/.rvm/log/ruby-1.9.2-p180/make.log
............
............

compiling pty
make[1]: Nothing to be done for `all'.
compiling racc/cparse
make[1]: Nothing to be done for `all'.
compiling readline
gcc -I. -I../../.ext/include/x86_64-darwin10.7.0 -I../.././include -I../.././ext/readline -DRUBY_EXTCONF_H=\"extconf.h\" -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wshorten-64-to-32 -Wno-long-long  -fno-common -pipe  -o readline.o -c readline.c
readline.c: In function ‘username_completion_proc_call’:
readline.c:1386: error: ‘username_completion_function’ undeclared (first use in this function)
readline.c:1386: error: (Each undeclared identifier is reported only once
readline.c:1386: error: for each function it appears in.)
make[1]: *** [readline.o] Error 1
make: *** [mkmain.sh] Error 1
[2011-04-11 22:37:10] make 
gcc -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wshorten-64-to-32 -Wno-long-long  -fno-common -pipe -L. -L/usr/local/lib -Wl,-u,_objc_msgSend   main.o dmydln.o dmyencoding.o dmyversion.o miniprelude.o array.o bignum.o class.o compar.o complex.o dir.o dln_find.o enum.o enumerator.o error.o eval.o load.o proc.o file.o gc.o hash.o inits.o io.o marshal.o math.o node.o numeric.o object.o pack.o parse.o process.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o safe.o signal.o sprintf.o st.o strftime.o string.o struct.o time.o transcode.o util.o variable.o compile.o debug.o iseq.o vm.o vm_dump.o thread.o cont.o ascii.o us_ascii.o unicode.o utf_8.o newline.o  dmyext.o -lpthread -ldl -lobjc  -o miniruby
rbconfig.rb unchanged
./miniruby -I./lib -I.ext/common -I./- -r./ext/purelib.rb  ./enc/make_encmake.rb --builtin-encs="ascii.o us_ascii.o unicode.o utf_8.o" --builtin-transes="newline.o" enc.mk 
./miniruby -I./lib -I.ext/common -I./- -r./ext/purelib.rb  -I. ./tool/compile_prelude.rb ./prelude.rb ./enc/prelude.rb ./gem_prelude.rb prelude.c
gcc -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wshorten-64-to-32 -Wno-long-long  -fno-common -pipe -I. -I.ext/include/x86_64-darwin10.7.0 -I./include -I. -DRUBY_EXPORT -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -o prelude.o -c prelude.c
ar rcu libruby.1.9.1-static.a dln.o encoding.o version.o array.o bignum.o class.o compar.o complex.o dir.o dln_find.o enum.o enumerator.o error.o eval.o load.o proc.o file.o gc.o hash.o inits.o io.o marshal.o math.o node.o numeric.o object.o pack.o parse.o process.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o safe.o signal.o sprintf.o st.o strftime.o string.o struct.o time.o transcode.o util.o variable.o compile.o debug.o iseq.o vm.o vm_dump.o thread.o cont.o ascii.o us_ascii.o unicode.o utf_8.o newline.o  prelude.o dmyext.o
gcc -dynamiclib -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -Wl,-flat_namespace -install_name /Volumes/HDD/Users/tim/.rvm/rubies/ruby-1.9.2-p180/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    dln.o encoding.o version.o array.o bignum.o class.o compar.o complex.o dir.o dln_find.o enum.o enumerator.o error.o eval.o load.o proc.o file.o gc.o hash.o inits.o io.o marshal.o math.o node.o numeric.o object.o pack.o parse.o process.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o safe.o signal.o sprintf.o st.o strftime.o string.o struct.o time.o transcode.o util.o variable.o compile.o debug.o iseq.o vm.o vm_dump.o thread.o cont.o ascii.o us_ascii.o unicode.o utf_8.o newline.o  prelude.o dmyext.o  -o libruby.1.9.1.dylib
ld: can't write output file: libruby.1.9.1.dylib
collect2: ld returned 1 exit status
make: *** [libruby.1.9.1.dylib] Error 1