diff --git a/Makefile.am b/Makefile.am
index e925ab63..638cfed5 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -107,6 +107,7 @@ configure-documentation:
 		--ignore-prg 'disable-option-checking,enable-fast-install # should be in INSTALL' \
 		--ignore-prg 'disable-libtool-lock,with-pic,with-gnu-ld,with-sysroot # for libtool' \
 		--ignore-prg 'runstatedir #new in autoconf 2.70, backported in Debian' \
+		--ignore-prg 'with-aix-soname #new in libtool 2.4.4' \
 		--ignore-prg 'with-x # no use, it would not work without X'
 
 .PHONY: configure-documentation