/opt/ruby1.9/bin/ruby extconf.rb 
checking for mmap() in sys/mman.h... yes
checking for munmap() in sys/mman.h... yes
checking for mremap() in sys/mman.h... yes
checking for getpagesize() in unistd.h... yes
checking for rb_thread_blocking_region()... yes
checking for rb_thread_io_blocking_region()... yes
checking for GCC 4+ atomic builtins... yes
creating Makefile

make
compiling raindrops.c
compiling linux_inet_diag.c
In file included from linux_inet_diag.c:56:0:
/usr/include/linux/rtnetlink.h:594:790: error: unterminated comment
Makefile:206: recipe for target 'linux_inet_diag.o' failed
make: *** [linux_inet_diag.o] Error 1