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@@ -113,8 +113,25 @@ private
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   def check_whether_apache_uses_prefork_mpm
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     line
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-		mpm = `#{HTTPD} -V | grep 'Server MPM'`.strip.split(/:/, 2)[1].strip
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-		if mpm != "Prefork"
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+		# 'httpd -V' output is in the form of:
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+		#
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+		# Server MPM:      Prefork     # <--- this line is not always available!
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+		# ...
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+		# Server compiled with....
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+		#  -D APACHE_MPM_DIR="server/mpm/prefork"
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+		output = `#{HTTPD} -V`
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+		output =~ /^Server MPM: +(.*)$/
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+		if $1
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+			mpm = $1.downcase
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+		else
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+			output =~ /APACHE_MPM_DIR="server\/mpm\/(.*)"/
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+			if $1
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+				mpm = $1.downcase
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+			else
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+				mpm = nil
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+			end
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+		end
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+		if mpm != "prefork"
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       render_template 'apache_must_be_compiled_with_prefork_mpm',
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         :current_mpm => mpm
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       wait