gdk-pixbuf dependents malloc issue

[barracuda156]

I get this when installing some gdk-pixbuf dependents:

gdk-pixbuf-query-loaders(9010) malloc: *** error for object 0xa0931034: Non-aligned pointer being freed
*** set a breakpoint in malloc_error_break to debug
gdk-pixbuf-query-loaders(9010) malloc: *** error for object 0xa09310a4: Non-aligned pointer being freed
*** set a breakpoint in malloc_error_break to debug

This happens after install, before cleaning build directory. So install succeeds.

gdk-pixbuf is built with gcc-4.2, as we as its dependents are (say, librsvg). So we should not get a double libstdc++ issue as in other malloc errors cases.

What may cause this, any ideas?