I was using the 'macirb' and this is what I got: I had entered this: dawnmcds-powerbook-g4-12:~ Tim$ macirb irb(main):001:0> framework 'cocoa' => true irb(main):002:0> framework 'opengl' => true irb(main):003:0> a = NSSize.new => #<NSSize width=0.0 height=0.0> irb(main):004:0> a => #<NSSize width=0.0 height=0.0> irb(main):005:0> a.width => 0.0 irb(main):007:0> a.width = 640 => 640 irb(main):008:0> a.height = 480 => 480 irb(main):009:0> a => #<NSSize width=640.0 height=480.0> irb(main):010:0> glMatrixMode(GL_PROJECTION) and then the glMatrixMode call got me this bus error: (irb):10: [BUG] Bus Error MacRuby version 0.4 (ruby 1.9.1) [universal-darwin9.0, ppc] -- stack frame ------------ 0000 (0x30040): 00000004 0001 (0x30044): 00000000 0002 (0x30048): 00000004 0003 (0x3004c): 00000000 0004 (0x30050): 00000004 0005 (0x30054): 00000000 0006 (0x30058): 00571940 0007 (0x3005c): 010cb370 0008 (0x30060): 0128e100 0009 (0x30064): 00000004 0010 (0x30068): 01411e60 0011 (0x3006c): 00000004 0012 (0x30070): 0056de80 0013 (0x30074): 00000004 0014 (0x30078): 000aff74 0015 (0x3007c): 00000004 0016 (0x30080): 01411e8c 0017 (0x30084): 0128e100 0018 (0x30088): 00000004 0019 (0x3008c): 01411f60 0020 (0x30090): 01069660 0021 (0x30094): 00000004 0022 (0x30098): 000afe94 0023 (0x3009c): 00000004 0024 (0x300a0): 0057a6f0 0025 (0x300a4): 00000004 0026 (0x300a8): 000afe5c 0027 (0x300ac): 00000004 0028 (0x300b0): 00030098 (= 22) 0029 (0x300b4): 00000004 0030 (0x300b8): 00000004 0031 (0x300bc): 000afdb4 0032 (0x300c0): 0144aab0 0033 (0x300c4): 00000004 0034 (0x300c8): 000300b0 (= 28) 0035 (0x300cc): 01438510 0036 (0x300d0): 00000015 0037 (0x300d4): 00000004 0038 (0x300d8): 01262e44 0039 (0x300dc): 00000004 0040 (0x300e0): 0056e740 0041 (0x300e4): 0056e110 0042 (0x300e8): 00000004 0043 (0x300ec): 000afcd4 0044 (0x300f0): 00000004 0045 (0x300f4): 00000004 0046 (0x300f8): 00000004 0047 (0x300fc): 00000004 0048 (0x30100): 00000004 0049 (0x30104): 00000004 0050 (0x30108): 00000004 0051 (0x3010c): 000300d8 (= 38) 0052 (0x30110): 0128dc30 0053 (0x30114): 01438510 0054 (0x30118): 00000015 0055 (0x3011c): 00000004 0056 (0x30120): 00000000 0057 (0x30124): 00000004 0058 (0x30128): 0128bf20 0059 (0x3012c): 0128dc30 0060 (0x30130): 01438510 0061 (0x30134): 0127c220 0062 (0x30138): 00000015 0063 (0x3013c): 00000004 0064 (0x30140): 00000000 0065 (0x30144): 00000004 0066 (0x30148): 01438510 0067 (0x3014c): 012b5910 0068 (0x30150): 0127c220 0069 (0x30154): 00000015 0070 (0x30158): 00000004 0071 (0x3015c): 00000000 0072 (0x30160): 00000004 0073 (0x30164): 00000000 0074 (0x30168): 00000004 0075 (0x3016c): 0144b180 0076 (0x30170): 00000004 0077 (0x30174): 00002e03 0078 (0x30178): 00000004 0079 (0x3017c): 00000000 <- lfp <- dfp -- control frame ---------- c:0024 p:---- s:0080 b:0080 l:000079 d:000079 CFUNC :glMatrixMode c:0023 p:0014 s:0076 b:0076 l:000214 d:001f64 EVAL (irb):10 c:0022 p:---- s:0074 b:0074 l:000073 d:000073 FINISH :empty? c:0021 p:---- s:0072 b:0072 l:000071 d:000071 CFUNC :eval c:0020 p:0023 s:0065 b:0065 l:000064 d:000064 METHOD /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/workspace.rb:80 c:0019 p:0025 s:0058 b:0057 l:000056 d:000056 METHOD /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/context.rb:218 c:0018 p:0024 s:0052 b:0052 l:0024d4 d:000051 BLOCK /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:149 c:0017 p:0025 s:0044 b:0044 l:000043 d:000043 METHOD /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:263 c:0016 p:0009 s:0039 b:0039 l:0024d4 d:000038 BLOCK /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:146 c:0015 p:0110 s:0035 b:0035 l:000022 d:000034 BLOCK /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/ruby-lex.rb:244 c:0014 p:---- s:0034 b:0034 l:000033 d:000033 FINISH :block_given? c:0013 p:---- s:0032 b:0032 l:000031 d:000031 CFUNC :loop c:0012 p:0007 s:0029 b:0029 l:000022 d:000028 BLOCK /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/ruby-lex.rb:230 c:0011 p:---- s:0029 b:0029 l:000028 d:000028 FINISH :each c:0010 p:---- s:0027 b:0027 l:000026 d:000026 CFUNC :catch c:0009 p:0017 s:0023 b:0023 l:000022 d:000022 METHOD /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/ruby-lex.rb:229 c:0008 p:0034 s:0020 b:0020 l:0024d4 d:0024d4 METHOD /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:145 c:0007 p:0009 s:0017 b:0017 l:00130c d:000016 BLOCK /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:69 c:0006 p:---- s:0017 b:0017 l:000016 d:000016 FINISH :(null) c:0005 p:---- s:0015 b:0015 l:000014 d:000014 CFUNC :catch c:0004 p:0147 s:0011 b:0011 l:00130c d:00130c METHOD /Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:68 c:0003 p:0033 s:0006 b:0006 l:000005 d:000005 TOP /usr/local/bin/macirb:12 c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH :inherited: c:0001 p:0000 s:0002 b:0002 l:000001 d:000001 TOP --------------------------- DBG> : "(irb):10:in `glMatrixMode'" DBG> : "(irb):10:in `irb_binding'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/workspace.rb:80:in `eval'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/workspace.rb:80:in `evaluate'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/context.rb:218:in `evaluate'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:149:in `block (2 levels) in eval_input'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:263:in `signal_status'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:146:in `block in eval_input'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/ruby-lex.rb:244:in `block (2 levels) in each_top_level_statement'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/ruby-lex.rb:230:in `loop'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/ruby-lex.rb:230:in `block in each_top_level_statement'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `catch'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `each_top_level_statement'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:145:in `eval_input'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:69:in `block in start'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:68:in `catch'" DBG> : "/Library/Frameworks/MacRuby.framework/Versions/0.4/usr/lib/ruby/1.9.1/irb.rb:68:in `start'" DBG> : "/usr/local/bin/macirb:12:in `<main>'" -- backtrace of native function call (Use addr2line) -- 0x2ec838 0x20778c 0x2077f8 0x2a2934 0x941fc99c ------------------------------------------------------- Abort trap Any help? I installed with the PPC instructions on the macruby wiki. -- --Timothy.