Hello again, One of the gem I use is mysql. It used to work. I still have forensic evidence of that in the older place where gems were installed (deep within /Library/Frameworks). Now it doesn't install. Here is the full terminal transcript: Building native extensions. This could take a while... ERROR: Error installing mysql: ERROR: Failed to build gem native extension. /Library/Frameworks/MacRuby.framework/Versions/0.12/usr/bin/macruby extconf.rb checking for mysql_ssl_set()... yes checking for rb_str_set_len()... yes checking for rb_thread_start_timer()... no checking for mysql.h... yes i686-apple-darwin11-llvm-gcc-4.2: conftest.m: No such file or directory i686-apple-darwin11-llvm-gcc-4.2: no input files *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/bin/macruby --with-mysql-config --without-mysql-config /Library/Frameworks/MacRuby.framework/Versions/0.12/usr/lib/ruby/1.9.2/mkmf.rb:1987:in `mkmf_failed': *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/bin/macruby --with-mysql-config --without-mysql-config (SystemExit) from /Library/Frameworks/MacRuby.framework/Versions/0.12/usr/lib/ruby/1.9.2/mkmf.rb:2077:in `block' from /Library/Ruby/Gems/MacRuby/0.12/gems/mysql-2.8.1/ext/mysql_api/extconf.rb:75:in `<main>' Gem files will remain installed in /Library/Ruby/Gems/MacRuby/0.12/gems/mysql-2.8.1 for inspection. Results logged to /Library/Ruby/Gems/MacRuby/0.12/gems/mysql-2.8.1/ext/mysql_api/gem_make.out I checked the mkmf.log for more info. Here is its full content: have_func: checking for mysql_ssl_set()... -------------------- yes "/usr/bin/gcc-4.2 -o conftest -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. -I/opt/local/include/mysql5/mysql -pipe -fPIC -D_P1003_1B_VISIBLE -DSIGNAL_WITH_VIO_CLOSE -DSIGNALS_DONT_BREAK_READ -DIGNORE_SIGHUP_SIGQUIT -DDONT_DECLARE_CXA_PURE_VIRTUAL -fobjc-gc-only -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -fobjc-gc-------------------- I tried to execute the call to gcc-4.2 in there. gcc replies "no input files". the mkmf.rb file mentioned is a MacRuby file and the gem installs fine using the regular "gem" command, so I suspect the problem is MacRuby's (especially since I had installed no so long ago), but I am not enough of a rubyist to go further. Any suggestion? Thanks, Jean-Denis [Logo Kleegroup] Klee Group is a great place to work - Il fait bon travailler ? Klee Group