Bug 2955. Workaround for lack of atomic operations in GCCE standard libraries (fall back to default use of Mutex)
--- pngconf.h.orig 2007-09-08 05:22:56.000000000 +0200
+++ pngconf.h 2007-09-09 00:00:00.000000000 +0200
@@ -1375,6 +1375,14 @@
# if 0 /* ... other platforms, with other meanings */
# endif
# endif
+
+# if !defined(PNG_IMPEXP)
+# include <qconfig.h>
+# if defined(QT_VISIBILITY_AVAILABLE)
+# define PNG_IMPEXP __attribute__((visibility("default")))
+# endif
+# endif
+
#endif
#ifndef PNGAPI