diff --git a/src/mca/ptl/ib/configure.stub b/src/mca/ptl/ib/configure.stub
index e88098dc89..52a30d9f33 100644
--- a/src/mca/ptl/ib/configure.stub
+++ b/src/mca/ptl/ib/configure.stub
@@ -61,14 +61,14 @@ AC_DEFUN([MCA_CONFIGURE_STUB],[
     EXTRA_LDFLAGS=
     if test -n "$with_ptl_ib_libdir"; then
         if test -d "$with_ptl_ib_libdir/lib"; then
-            EXTRA_LDFLAGS="-L$with_ptl_ib_libdir/lib64"
+            EXTRA_LDFLAGS="-L$with_ptl_ib_libdir/lib"
         else
             AC_MSG_WARN([*** Warning: cannot find $with_ptl_ib_libdir/lib])
             AC_MSG_WARN([*** Will still try to configure ib ptl anyway...])
         fi
     elif test -n "$with_ptl_ib"; then
         if test -d "$with_ptl_ib/lib"; then
-            EXTRA_LDFLAGS="-L$with_ptl_ib/lib64"
+            EXTRA_LDFLAGS="-L$with_ptl_ib/lib"
         else
             AC_MSG_WARN([*** Warning: cannot find $with_ptl_ib/lib])
             AC_MSG_WARN([*** Will still try to configure ib ptl anyway...])
@@ -80,8 +80,18 @@ AC_DEFUN([MCA_CONFIGURE_STUB],[
 
     LDFLAGS="$LDFLAGS $EXTRA_LDFLAGS"
     AC_CHECK_LIB([vapi], [EVAPI_list_hcas], [], [vapi_badness=true],
-	 [-lmpga -lmosal])
-    LIBS="$LIBS -lmpga -lmosal"
+	 [-lmtl_common -lmpga -lmosal])
+    if test -n "$vapi_badness"; then
+         AC_CHECK_LIB([pthread], [pthread_create], 
+		      [pthread=yes LIBS="$LIBS -lpthread"],
+		      [pthread=no])
+	 if test "$pthread" = "yes"; then
+	     AC_CHECK_LIB([vapi], [EVAPI_open_hca], [],
+                          [AC_MSG_ERROR([*** Cannot find libvapi])],
+                          [-lmtl_common -lmpga -lmosal])
+	fi
+    fi    
+    LIBS="$LIBS -lmtl_common -lmpga"
 
     #
     # Save extra compiler/linker flags so that they can be added in