--- configure.ac.orig	2008-07-21 15:48:33 +0200
+++ configure.ac	2008-07-21 15:49:23 +0200
@@ -198,6 +198,8 @@
         XTHREADLIB="-pthread" ;;
     solaris*)
 	XTHREAD_CFLAGS="-D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS" ;;
+    aix*)
+	XTHREAD_CFLAGS="-pthread" ;;
     esac
 fi
 AC_SUBST(XTHREADLIB)