--- a/configure.ac
+++ b/configure.ac
@@ -461,6 +461,9 @@
         AC_MSG_ERROR([Couldn't find BLT])
     fi
     rm -f conftest.tcl
+
+    AC_SEARCH_LIBS([Blt_GetVector], [BLT BLT24 BLT25],,
+        [AC_MSG_ERROR([Couldnt find BLT library.])])
     
     AC_CHECK_LIB([pthread], [pthread_create])