diff -Naur geos-3.4.2.orig/macros/ruby.m4 geos-3.4.2/macros/ruby.m4
--- a/macros/ruby.m4	2013-08-25 11:10:32.000000000 -0400
+++ b/macros/ruby.m4	2014-11-05 06:35:39.347830878 -0500
@@ -38,7 +38,7 @@
 		RUBY_EXTENSION_DIR=`$RUBY -rrbconfig -e 'puts RbConfig::CONFIG[["sitearchdir"]] || Config::CONFIG[["sitearchdir"]]'`
 
 		dnl Get Ruby shared library name, this does not include the lib prefix or extension name
-		RUBY_SO_NAME=`$RUBY -rrbconfig -e 'puts RbConfig::CONFIG[["LIBRUBY_SO"]] || Config::CONFIG[["RUBY_SO_NAME"]]'`
+		RUBY_SO_NAME=`$RUBY -rrbconfig -e 'puts RbConfig::CONFIG[["RUBY_SO_NAME"]] || Config::CONFIG[["RUBY_SO_NAME"]]'`
 		
 		dnl Get Ruby shared libary name
 		RUBY_SHARED_LIB=`$RUBY -rrbconfig -e 'puts RbConfig::CONFIG[["LIBRUBY"]] || Config::CONFIG[["LIBRUBY"]]'`