Index: configure.ac
===================================================================
--- configure.ac	(revision 320171)
+++ configure.ac	(working copy)
@@ -1142,6 +1142,8 @@
 fi
 
 AST_EXT_LIB_CHECK([ICONV], [iconv], [iconv_open], [iconv.h])
+# GNU libiconv #defineis iconv_open libiconv_open, so we need to search for that symbol
+AST_EXT_LIB_CHECK([ICONV], [iconv], [libiconv_open], [iconv.h])
 # Some versions of Linux package iconv in glibc
 AST_EXT_LIB_CHECK([ICONV], [c], [iconv_close], [iconv.h])