From: "Matteo F. Vescovi" <mfv.debian@gmail.com>
Date: Fri, 21 Dec 2012 16:31:29 +0100
Subject: Fix_IlmBase_issue

This first patch hides the private symbols
even on kFreeBSD and Hurd, besides Linux.
---
 src/CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index adb380c..71f9a3e 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -130,7 +130,7 @@ if (CMAKE_COMPILER_IS_CLANG OR CMAKE_COMPILER_IS_GNUCC)
         # Turn default symbol visibility to hidden
         set (VISIBILITY_COMMAND "-fvisibility=hidden -fvisibility-inlines-hidden")
         add_definitions (${VISIBILITY_COMMAND})
-        if (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+        if (CMAKE_SYSTEM_NAME MATCHES "Linux|kFreeBSD" OR CMAKE_SYSTEM_NAME STREQUAL "GNU")
             # Linux: also hide all the symbols of dependent libraries to
             # prevent clashes if an app using OIIO is linked against
             # other verions of our dependencies.