I forgot: this is what " $ g++ -v" gives me: Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/x86_64-apple-darwin12/4.7.2/lto-wrapper Target: x86_64-apple-darwin12 Configured with: ../gcc-4.7.2/configure --prefix=/opt/local --build=x86_64-apple-darwin12 --enable-languages=c,c++,objc,obj-c++,lto,fortran,java --libdir=/opt/local/lib/gcc47 --includedir=/opt/local/include/gcc47 --infodir=/opt/local/share/info --mandir=/opt/local/share/man --datarootdir=/opt/local/share/gcc-4.7 --with-libiconv-prefix=/opt/local --with-local-prefix=/opt/local --with-system-zlib --disable-nls --program-suffix=-mp-4.7 --with-gxx-include-dir=/opt/local/include/gcc47/c++/ --with-gmp=/opt/local --with-mpfr=/opt/local --with-mpc=/opt/local --with-ppl=/opt/local --with-cloog=/opt/local --enable-cloog-backend=isl --disable-cloog-version-check --enable-stage1-checking --disable-multilib --enable-lto --enable-libstdcxx-time --with-as=/opt/local/bin/as --with-ld=/opt/local/bin/ld --with-ar=/opt/local/bin/ar --with-bugurl=https://trac.macports.org/newticket --disable-ppl-version-check --with-pkgversion='MacPorts gcc47 4.7.2_2' Thread model: posix gcc version 4.7.2 (MacPorts gcc47 4.7.2_2) ----- Federico Pirovano -- View this message in context: http://gcc.1065356.n5.nabble.com/Problems-with-decimal-decimal-header-on-OS-X-tp902209p902243.html Sent from the gcc - Help mailing list archive at Nabble.com.