extconf.rb in proc-wait3-1.9.2

- old
+ new

@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 ########################################################
 # Use the mkmf.rb file that I provide, so I can use the
 # have_enum_member method
 ########################################################
 require 'mkmf'
@@ -10,11 +12,11 @@
 have_header('sys/resource.h') # apt install libbsd-dev
 have_header('sys/wait.h')
 
 # wait3 is mandatory.
 unless have_func('wait3')
-  STDERR.puts 'wait3() function not found'
+  warn 'wait3() function not found'
   exit
 end
 
 # Yay, Linux
 have_func('str2sig')
@@ -65,7 +67,10 @@
 have_const('P_PROJID', 'signal.h')
 have_const('P_TASKID', 'signal.h')
 
 # RUSAGE_THREAD is Linux-specific
 have_const('RUSAGE_THREAD', 'sys/resource.h')
+
+# BSD
+have_const('P_JAILID', 'sys/wait.h')
 
 create_makefile('proc/wait3', 'proc')