Modified fltk1 to enable thread support.

develop/fltk1/fltk1.conf

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 # 
 # Filename: package/.../fltk1/fltk1.conf
-# Copyright (C) 2006 The OpenSDE Project
+# Copyright (C) 2006 - 2007 The OpenSDE Project
 # Copyright (C) 2006 The T2 SDE Project
 # 
 # More information can be found in the files COPYING and README.
@@ -15,3 +15,5 @@
 
 # Checking whether to build fltk static or shared
 [ "$SDECFG_STATIC" == 0 ] && var_append confopt ' ' "--enable-shared"
+
+var_append confopt ' ' "--enable-threads"