diff --git a/Source/kwsys/Configure.h.in b/Source/kwsys/Configure.h.in
index b57b6989b..e3fa4c734 100644
--- a/Source/kwsys/Configure.h.in
+++ b/Source/kwsys/Configure.h.in
@@ -88,11 +88,15 @@
 #endif
 
 /* Setup the export macro.  */
-#if defined(_WIN32) && @KWSYS_BUILD_SHARED@
-# if defined(@KWSYS_NAMESPACE@_EXPORTS)
-#  define @KWSYS_NAMESPACE@_EXPORT __declspec(dllexport)
-# else
-#  define @KWSYS_NAMESPACE@_EXPORT __declspec(dllimport)
+#if @KWSYS_BUILD_SHARED@
+# if defined(_WIN32) || defined(__CYGWIN__)
+#  if defined(@KWSYS_NAMESPACE@_EXPORTS)
+#   define @KWSYS_NAMESPACE@_EXPORT __declspec(dllexport)
+#  else
+#   define @KWSYS_NAMESPACE@_EXPORT __declspec(dllimport)
+#  endif
+# elif __GNUC__ >= 4
+#  define @KWSYS_NAMESPACE@_EXPORT __attribute__ ((visibility("default")))
 # endif
 #else
 # define @KWSYS_NAMESPACE@_EXPORT