$ make
/usr/bin/perl -I/usr/lib/perl5/5.6.1/i386-linux -I/usr/lib/perl5/5.6.1 /usr/lib/perl5/5.6.1/ExtUtils/xsubpp  -typemap /usr/lib/perl5/5.6.1/ExtUtils/typemap test_c.xs > test_c.xsc && mv test_c.xsc test_c.c
gcc -c  -fno-strict-aliasing -I/usr/local/include -O2 -march=i386 -mcpu=i686   -DVERSION=\"0.01\" -DXS_VERSION=\"0.01\" -fPIC -I/usr/lib/perl5/5.6.1/i386-linux/CORE  test_c.c
test_c.xs: In function `XS_test_c_do_matrix':
test_c.xs:19: subscripted value is neither array nor pointer
test_c.xs:19: subscripted value is neither array nor pointer
make: *** [test_c.o] Error 1