allegro build error

[harbour.01@…]

[ tested on Snow Leopard + XCode 3.2 ]

[local/bin] > install allegro     
--->  Computing dependencies for allegro
--->  Fetching allegro
--->  Attempting to fetch allegro-4.2.2.tar.gz from http://mesh.dl.sourceforge.net/alleg
--->  Verifying checksum(s) for allegro
--->  Extracting allegro
--->  Applying patches to allegro
--->  Configuring allegro
--->  Building allegro
Error: Target org.macports.build returned: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_allegro/work/allegro-4.2.2" && /usr/bin/make -j2 PREFIX=/opt/local " returned error 2
Command output: Compiling Allegro for MacOS X, optimised. Please wait...
/usr/bin/gcc-4.2 -DALLEGRO_SRC -DALLEGRO_LIB_BUILD  -Wall -Wno-unused -Wno-long-double  -O2 -funroll-loops -ffast-math -fomit-frame-pointer -fno-common -pipe -dynamic -DALLEGRO_NO_ASM -I. -I./include -o obj/macosx/alleg/allegro.o -c src/allegro.c
/usr/bin/gcc-4.2 -DALLEGRO_SRC -DALLEGRO_LIB_BUILD  -Wall -Wno-unused -Wno-long-double  -O2 -funroll-loops -ffast-math -fomit-frame-pointer -fno-common -pipe -dynamic -DALLEGRO_NO_ASM -I. -I./include -o obj/macosx/alleg/blit.o -c src/blit.c
cc1: error: unrecognized command line option "-Wno-long-double"
cc1: error: unrecognized command line option "-Wno-long-double"
make: *** [obj/macosx/alleg/allegro.o] Error 1
make: *** Waiting for unfinished jobs....
make: *** [obj/macosx/alleg/blit.o] Error 1