Bring in line with current practice for Darwin dynamic libs
SODIR=$(SODIR_$(SYS))
SO_LDFLAGS_posix=-shared -Wl,-soname,$@
-SO_LDFLAGS_darwin=-dynamiclib -flat_namespace -undefined suppress -fno-common \
- -headerpad_max_install_names
+SO_LDFLAGS_darwin=-dynamiclib -twolevel_namespace -undefined dynamic_lookup \
+ -fno-common -headerpad_max_install_names -install_name $(libdir)/$@
SO_LDFLAGS_mingw=-shared -Wl,--out-implib,librtmp.dll.a
SO_LDFLAGS=$(SO_LDFLAGS_$(SYS))