isl-0.15 is required to build GCC with the Graphite loop optimizations. You can download the isl-0.15 from ftp://gcc.gnu.org/pub/gcc/infrastructure/
Compiling isl-0.15
# bunzip2 isl-015.tar.bz2 # tar -xvf isl-0.15 # ./configure --prefix=/usr/local/isl-0.15 --with-gmp-prefix=/usr/local/gmp-4.3.2 # make && make install
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