Unrecognized options gcc version 4.4.0

[Tovrea, George W (US SSA)]

tovrea@warhol%printenv CXX
/home/users/tovrea/local/sgi6/bin/g++
tovrea@warhol%$CXX -v
Using built-in specs.
Target: mips-sgi-irix6.5
Configured with: /home/users/tovrea/GCC_SGI6/gcc-4.4.0/configure --prefix=/home/users/tovrea/local/sgi6 --enable-shared --with-ld=/home/users/tovrea/local/sgi6/bin/ld --with-as=/home/users/tovrea/local/sgi6/bin/as --enable-bootstrap --enable-languages=c,c++ --enable-version-specific-runtime-libs --enable-cxx=yes --enable-install-libiberty --with-gnu-ld --with-gnu-as --with-gmp=/home/users/tovrea/local/sgi6/lib --with-mpfr=/home/users/tovrea/local/sgi6/lib --with-ppl=/home/users/tovrea/local/sgi6/lib --with-cloog=/home/users/tovrea/local/sgi6/lib
Thread model: posix
gcc version 4.4.0 (GCC) 

$CXX -o ffmeta ffmeta_main.cc -pthreads $CPPFLAGS -L${HOME}/XERCES_C/sgi6_local/lib $LDFLAGS -lnsl -lxnet -lavformat -lavcodec -lavutil -lx264 -lpthread -lbz2 -lz -lxerces-c

Getting the following "unrecognized options":
g++: unrecognized option '-pthreads'
g++: unrecognized option '-no_auto_include'

Bill Tovrea

BAE Systems

16550 West Bernardo Drive
San Diego, CA 92127

Telephone: (858) 592-5292

Pager: (888) 971-4964

E-mail: George.Tovrea@baesystems.com