title: How to install SystemTimer on 1.9.2?
body: <p>I've just upgraded my app from 1.8.7 to 1.9.2 using RVM and had to add RubyGems and Bundler, ran bundle install and got everything to work except SystemTimer. Google-fu returns nothing and I see others have had issue with it in 1.9 but some have gotten it to work. Any ideas?</p>
  
  <pre><code>pawel:bodb pawel$ sudo gem install SystemTimer
  Building native extensions.  This could take a while...
  /Users/pawel/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/ext/builder.rb:48: warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
  ERROR:  Error installing SystemTimer:
  ERROR: Failed to build gem native extension.
  
  /Users/pawel/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb
  creating Makefile
  
  make
  /usr/bin/gcc-4.2 -I. -I/Users/pawel/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/x86_64-darwin10.3.0
  -I/Users/pawel/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/ruby/backward -I/Users/pawel/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1 -I.
  -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 system_timer_native.o -c system_timer_native.c
  In file included from system_timer_native.c:8:
  /Users/pawel/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/ruby/backward/rubysig.h:14:2: warning: #warning rubysig.h is obsolete
  system_timer_native.c: In function ‘install_first_timer_and_save_original_configuration’:
  system_timer_native.c:46: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c:53: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
  system_timer_native.c:57: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c:62: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c:65: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
  system_timer_native.c:69: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c:82: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
  system_timer_native.c:89: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c:96: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
  system_timer_native.c:101: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c: In function ‘install_next_timer’:
  system_timer_native.c:112: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c:119: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
  system_timer_native.c:123: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c:130: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
  system_timer_native.c:136: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c:143: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
  system_timer_native.c:146: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c: In function ‘restore_original_configuration’:
  system_timer_native.c:157: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
  system_timer_native.c:160: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c:168: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
  system_timer_native.c:170: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c:172: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
  system_timer_native.c: In function ‘restore_original_timer_interval’:
  system_timer_native.c:190: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
  system_timer_native.c:192: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c: In function ‘restore_sigalrm_mask’:
  system_timer_native.c:199: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c:201: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c: In function ‘install_ruby_sigalrm_handler’:
  system_timer_native.c:211: error: ‘rb_thread_critical’ undeclared (first use in this function)
  system_timer_native.c:211: error: (Each undeclared identifier is reported only once
  system_timer_native.c:211: error: for each function it appears in.)
  system_timer_native.c: In function ‘restore_original_ruby_sigalrm_handler’:
  system_timer_native.c:217: error: ‘rb_thread_critical’ undeclared (first use in this function)
  system_timer_native.c: In function ‘clear_pending_sigalrm_for_ruby_threads’:
  system_timer_native.c:266: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c: In function ‘set_itimerval’:
  system_timer_native.c:290: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  system_timer_native.c:295: warning: implicit conversion shortens 64-bit value into a 32-bit value
  system_timer_native.c:299: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
  make: *** [system_timer_native.o] Error 1
  
  
  Gem files will remain installed in /Users/pawel/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/SystemTimer-1.2.3 for inspection.
  Results logged to /Users/pawel/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/SystemTimer-1.2.3/ext/system_timer/gem_make.out
  </code></pre>