You cannot check for a "b" sub-release as the tests are looking for integers (doing < and > comparisons). Indeed, libtool doesn't report the "b" when doing --version, probably just for that reason.

This commit was SVN r22365.

contrib/dist/make_orte_dist_tarball

@@ -25,7 +25,7 @@
 M4_TARGET_VERSION=1.4.13
 AM_TARGET_VERSION=1.11
 AC_TARGET_VERSION=2.65
-LT_TARGET_VERSION=2.2.6b
+LT_TARGET_VERSION=2.2.6
 
 #
 # Check command line flags