That is awful if you need the "-o" in LDFLAGS. The -o option is a standard option and preceedes the output file designation, this works for ld, cc, c89, gcc, CC, etc.

LDFLAGS, CFLAGS and CXXFLAGS should contain things like optimatizations, code generation options, environment options etc.

One of the few things that should not really go in there is "-o". Looks like you started with a very poor makefile.