Disable "-Wmismatched-new-delete", certainly needs another set of eyes to glance over this, but it appears hidden under a layer of templates, operators and inheritance the right thing happens:

new > posix_memalign / delete -> free. According to the man pages this would be correct.

indra/newview/lldrawable.cpp

@@ -54,6 +54,13 @@
 #include "llcontrolavatar.h"
 #include "lldrawpoolavatar.h"
 
+// <FS:ND> Tentatively ignoring mismatched new/delete from the MemTrackableNonVirtual. I think according to the docs
+// they are properly matched
+#if LL_LINUX
+#pragma GCC diagnostic ignored "-Wmismatched-new-delete"
+#endif
+// </FS:ND>
+
 const F32 MIN_INTERPOLATE_DISTANCE_SQUARED = 0.001f * 0.001f;
 const F32 MAX_INTERPOLATE_DISTANCE_SQUARED = 10.f * 10.f;
 const F32 OBJECT_DAMPING_TIME_CONSTANT = 0.06f;