I get the same error from trunk or testing versions. I have in the past downloaded readline from macports, but the /opt directory isn't in my path. Any ideas what is wrong with my setup? PS. When will we see version 0.4? Thanks, Dave. gcc -I. -I../../.ext/include/universal-darwin9.0 -I..//.././include - I..//.././ext/readline -DRUBY_EXTCONF_H=\"extconf.h\" -fno-common - fno-common -pipe -arch i386 -arch x86_64 -o readline.o -c readline.c readline.c: In function ‘filename_completion_proc_call’: readline.c:684: error: ‘filename_completion_function’ undeclared (first use in this function) readline.c:684: error: (Each undeclared identifier is reported only once readline.c:684: error: for each function it appears in.) readline.c:684: warning: assignment makes pointer from integer without a cast readline.c: In function ‘username_completion_proc_call’: readline.c:709: error: ‘username_completion_function’ undeclared (first use in this function) readline.c:709: warning: assignment makes pointer from integer without a cast readline.c: In function ‘filename_completion_proc_call’: readline.c:684: error: ‘filename_completion_function’ undeclared (first use in this function) readline.c:684: error: (Each undeclared identifier is reported only once readline.c:684: error: for each function it appears in.) readline.c:684: warning: assignment makes pointer from integer without a cast readline.c: In function ‘username_completion_proc_call’: readline.c:709: error: ‘username_completion_function’ undeclared (first use in this function) readline.c:709: warning: assignment makes pointer from integer without a cast {standard input}:386:non-relocatable subtraction expression, "_mReadline" minus "L00000000009$pb" {standard input}:386:symbol: "_mReadline" can't be undefined in a subtraction expression {standard input}:384:non-relocatable subtraction expression, "_completion_case_fold" minus "L00000000009$pb" {standard input}:384:symbol: "_completion_case_fold" can't be undefined in a subtraction expression {standard input}:370:non-relocatable subtraction expression, "_mReadline" minus "L00000000009$pb" {standard input}:370:symbol: "_mReadline" can't be undefined in a subtraction expression {standard input}:368:non-relocatable subtraction expression, "_completion_proc" minus "L00000000009$pb" {standard input}:368:symbol: "_completion_proc" can't be undefined in a subtraction expression {standard input}:349:non-relocatable subtraction expression, "_mReadline" minus "L00000000008$pb" {standard input}:349:symbol: "_mReadline" can't be undefined in a subtraction expression {standard input}:347:non-relocatable subtraction expression, "_completion_case_fold" minus "L00000000008$pb" {standard input}:347:symbol: "_completion_case_fold" can't be undefined in a subtraction expression {standard input}:325:non-relocatable subtraction expression, "_mReadline" minus "L00000000007$pb" {standard input}:325:symbol: "_mReadline" can't be undefined in a subtraction expression {standard input}:323:non-relocatable subtraction expression, "_completion_case_fold" minus "L00000000007$pb" {standard input}:323:symbol: "_completion_case_fold" can't be undefined in a subtraction expression {standard input}:303:non-relocatable subtraction expression, "_mReadline" minus "L00000000006$pb" {standard input}:303:symbol: "_mReadline" can't be undefined in a subtraction expression {standard input}:301:non-relocatable subtraction expression, "_completion_proc" minus "L00000000006$pb" {standard input}:301:symbol: "_completion_proc" can't be undefined in a subtraction expression {standard input}:279:non-relocatable subtraction expression, "_mReadline" minus "L00000000005$pb" {standard input}:279:symbol: "_mReadline" can't be undefined in a subtraction expression {standard input}:277:non-relocatable subtraction expression, "_completion_proc" minus "L00000000005$pb" {standard input}:277:symbol: "_completion_proc" can't be undefined in a subtraction expression lipo: can't open input file: /var/folders/h9/h9HZ8oRtFEmwwYfYj60PaU++ +TI/-Tmp-//ccyxzMdO.out (No such file or directory) make: *** [readline.o] Error 1 rake aborted! Command failed with status (1): [./miniruby -I./lib -I.ext/common - I./- -r....] /Users/dave/MacRuby-trunk/rakefile:587