Taken from the ArchLinux folks.

--- poppler.defs.orig	2010-12-30 05:55:07.000000000 +0000
+++ poppler.defs	2010-12-30 05:55:27.000000000 +0000
@@ -1794,7 +1794,7 @@
 
 (define-method get_text
   (of-object "PopplerPage")
-  (c-name "poppler_page_get_text")
+  (c-name "poppler_page_get_selected_text")
   (return-type "char*")
   (parameters
     '("PopplerSelectionStyle" "style")