What's the process for getting a c-extension to compile correctly with macgem? This is related to this github issue: https://github.com/ohler55/ox/issues/55 Below are the results of trying to install an xml parser with macgem. Even when these issues are ignored during compilation, it appears that macruby won't recognize a `require` of the gem. $ sudo macgem install ox Fetching: ox-1.9.4.gem (100%) Building native extensions. This could take a while... ERROR: Error installing ox: ERROR: Failed to build gem native extension. /Library/Frameworks/MacRuby.framework/Versions/0.12/usr/bin/macruby extconf.rb

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Creating Makefile for MacRuby version 1.9.2 on universal-darwin10.0 <<<<< creating Makefile

make /usr/bin/gcc -I. -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2 -I. -DRUBY_TYPE=MacRuby -DMACRUBY_RUBY -DRUBY_VERSION=1.9.2 -DRUBY_VERSION_MAJOR=1 -DRUBY_VERSION_MINOR=9 -DRUBY_VERSION_MICRO=2 -DHAS_RB_TIME_TIMESPEC=0 -DHAS_TM_GMTOFF=0 -DHAS_ENCODING_SUPPORT=0 -DHAS_PRIVATE_ENCODING=0 -DHAS_NANO_TIME=0 -DHAS_RSTRUCT=0 -DHAS_IVAR_HELPERS=0 -DHAS_PROC_WITH_BLOCK=0 -DHAS_TOP_LEVEL_ST_H=0 -DNEEDS_UIO=1 -Wall -fno-common -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -arch x86_64 -o base64.o -c base64.c /usr/bin/gcc -I. -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2 -I. -DRUBY_TYPE=MacRuby -DMACRUBY_RUBY -DRUBY_VERSION=1.9.2 -DRUBY_VERSION_MAJOR=1 -DRUBY_VERSION_MINOR=9 -DRUBY_VERSION_MICRO=2 -DHAS_RB_TIME_TIMESPEC=0 -DHAS_TM_GMTOFF=0 -DHAS_ENCODING_SUPPORT=0 -DHAS_PRIVATE_ENCODING=0 -DHAS_NANO_TIME=0 -DHAS_RSTRUCT=0 -DHAS_IVAR_HELPERS=0 -DHAS_PROC_WITH_BLOCK=0 -DHAS_TOP_LEVEL_ST_H=0 -DNEEDS_UIO=1 -Wall -fno-common -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -arch x86_64 -o cache.o -c cache.c /usr/bin/gcc -I. -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2 -I. -DRUBY_TYPE=MacRuby -DMACRUBY_RUBY -DRUBY_VERSION=1.9.2 -DRUBY_VERSION_MAJOR=1 -DRUBY_VERSION_MINOR=9 -DRUBY_VERSION_MICRO=2 -DHAS_RB_TIME_TIMESPEC=0 -DHAS_TM_GMTOFF=0 -DHAS_ENCODING_SUPPORT=0 -DHAS_PRIVATE_ENCODING=0 -DHAS_NANO_TIME=0 -DHAS_RSTRUCT=0 -DHAS_IVAR_HELPERS=0 -DHAS_PROC_WITH_BLOCK=0 -DHAS_TOP_LEVEL_ST_H=0 -DNEEDS_UIO=1 -Wall -fno-common -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -arch x86_64 -o cache8.o -c cache8.c /usr/bin/gcc -I. -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2 -I. -DRUBY_TYPE=MacRuby -DMACRUBY_RUBY -DRUBY_VERSION=1.9.2 -DRUBY_VERSION_MAJOR=1 -DRUBY_VERSION_MINOR=9 -DRUBY_VERSION_MICRO=2 -DHAS_RB_TIME_TIMESPEC=0 -DHAS_TM_GMTOFF=0 -DHAS_ENCODING_SUPPORT=0 -DHAS_PRIVATE_ENCODING=0 -DHAS_NANO_TIME=0 -DHAS_RSTRUCT=0 -DHAS_IVAR_HELPERS=0 -DHAS_PROC_WITH_BLOCK=0 -DHAS_TOP_LEVEL_ST_H=0 -DNEEDS_UIO=1 -Wall -fno-common -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -arch x86_64 -o cache8_test.o -c cache8_test.c /usr/bin/gcc -I. -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2 -I. -DRUBY_TYPE=MacRuby -DMACRUBY_RUBY -DRUBY_VERSION=1.9.2 -DRUBY_VERSION_MAJOR=1 -DRUBY_VERSION_MINOR=9 -DRUBY_VERSION_MICRO=2 -DHAS_RB_TIME_TIMESPEC=0 -DHAS_TM_GMTOFF=0 -DHAS_ENCODING_SUPPORT=0 -DHAS_PRIVATE_ENCODING=0 -DHAS_NANO_TIME=0 -DHAS_RSTRUCT=0 -DHAS_IVAR_HELPERS=0 -DHAS_PROC_WITH_BLOCK=0 -DHAS_TOP_LEVEL_ST_H=0 -DNEEDS_UIO=1 -Wall -fno-common -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -arch x86_64 -o cache_test.o -c cache_test.c /usr/bin/gcc -I. -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2 -I. -DRUBY_TYPE=MacRuby -DMACRUBY_RUBY -DRUBY_VERSION=1.9.2 -DRUBY_VERSION_MAJOR=1 -DRUBY_VERSION_MINOR=9 -DRUBY_VERSION_MICRO=2 -DHAS_RB_TIME_TIMESPEC=0 -DHAS_TM_GMTOFF=0 -DHAS_ENCODING_SUPPORT=0 -DHAS_PRIVATE_ENCODING=0 -DHAS_NANO_TIME=0 -DHAS_RSTRUCT=0 -DHAS_IVAR_HELPERS=0 -DHAS_PROC_WITH_BLOCK=0 -DHAS_TOP_LEVEL_ST_H=0 -DNEEDS_UIO=1 -Wall -fno-common -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -arch x86_64 -o dump.o -c dump.c In file included from dump.c:39: ox.h:190: error: expected specifier-qualifier-list before ‘rb_encoding’ dump.c: In function ‘dump_obj’: dump.c:598: warning: initialization discards qualifiers from pointer target type dump.c:838: warning: initialization discards qualifiers from pointer target type dump.c: In function ‘dump_gen_nodes’: dump.c:1108: warning: initialization discards qualifiers from pointer target type make: *** [dump.o] Error 1 Gem files will remain installed in /Library/Ruby/Gems/MacRuby/0.12/gems/ox-1.9.4 for inspection. Results logged to /Library/Ruby/Gems/MacRuby/0.12/gems/ox-1.9.4/ext/ox/gem_make.out