--- libltdl/config/ltmain.m4sh.old	2005-10-15 16:26:35.000000000 -0700
+++ libltdl/config/ltmain.m4sh	2005-10-17 21:26:09.785056333 -0700
@@ -2612,6 +2612,15 @@
 	    # Rhapsody C and math libraries are in the System framework
 	    deplibs="$deplibs System.ltframework"
 	    continue
+	    ;;
+	  *-*-sco3.2v5*)
+	    # Causes problems with __ctype
+	    test "X$arg" = "X-lc" && continue
+	    ;;
+	  *-*-sysv4.2uw2* | *-*-sysv5* | *-*-unixware* | *-*-OpenUNIX*)
+	    # cc / CC insert libc in correct order for threads to work
+	    test "X$arg" = "X-lc" && continue
+	    ;;
 	  esac
 	elif test "X$arg" = "X-lc_r"; then
 	 case $host in