/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/bin/ruby extconf.rb
checking for bzlib.h... yes
checking for BZ2_bzWriteOpen() in -lbz2... yes
creating Makefile

make
compiling bzip2.c
In file included from bzip2.c:5:0:
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/backward/rubyio.h:2:2: warning: #warning use "ruby/io.h" instead of "rubyio.h" [-Wcpp]
 #warning use "ruby/io.h" instead of "rubyio.h"
  ^
bzip2.c: In function ‘bz_find_struct’:
bzip2.c:117:71: error: ‘OpenFile’ undeclared (first use in this function)
             if (TYPE(bziv->io) == T_FILE && RFILE(bziv->io)->fptr == (OpenFile *)ptr) {
                                                                       ^
bzip2.c:117:71: note: each undeclared identifier is reported only once for each function it appears in
bzip2.c:117:81: error: expected expression before ‘)’ token
             if (TYPE(bziv->io) == T_FILE && RFILE(bziv->io)->fptr == (OpenFile *)ptr) {
                                                                                 ^
bzip2.c: In function ‘bz_io_data_finalize’:
bzip2.c:297:13: error: unknown type name ‘OpenFile’
             OpenFile *file = (OpenFile *)ptr;
             ^
bzip2.c:297:31: error: ‘OpenFile’ undeclared (first use in this function)
             OpenFile *file = (OpenFile *)ptr;
                               ^
bzip2.c:297:41: error: expected expression before ‘)’ token
             OpenFile *file = (OpenFile *)ptr;
                                         ^
bzip2.c:298:21: error: request for member ‘f’ in something not a structure or union
             if (file->f) {
                     ^
bzip2.c:299:28: error: request for member ‘f’ in something not a structure or union
                 fclose(file->f);
                            ^
bzip2.c:300:21: error: request for member ‘f’ in something not a structure or union
                 file->f = 0;
                     ^
bzip2.c:302:21: error: request for member ‘f2’ in something not a structure or union
             if (file->f2) {
                     ^
bzip2.c:303:28: error: request for member ‘f2’ in something not a structure or union
                 fclose(file->f2);
                            ^
bzip2.c:304:21: error: request for member ‘f2’ in something not a structure or union
                 file->f2 = 0;
                     ^
bzip2.c: In function ‘bz_writer_init’:
bzip2.c:473:9: error: unknown type name ‘OpenFile’
         OpenFile *fptr;
         ^
In file included from /home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/backward/rubyio.h:6:0,
                 from bzip2.c:5:
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/io.h:120:53: warning: assignment from incompatible pointer type [enabled by default]
 #define GetOpenFile(obj,fp) rb_io_check_closed((fp) = RFILE(rb_io_taint_check(obj))->fptr)
                                                     ^
bzip2.c:483:13: note: in expansion of macro ‘GetOpenFile’
             GetOpenFile(a, fptr);
             ^
In file included from /home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby.h:33:0,
                 from bzip2.c:1:
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/ruby.h:1107:30: warning: passing argument 1 of ‘rb_io_check_closed’ from incompatible pointer type [enabled by default]
 #define RFILE(obj)   (R_CAST(RFile)(obj))
                              ^
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/ruby.h:1093:30: note: in definition of macro ‘R_CAST’
 #define R_CAST(st)   (struct st*)
                              ^
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/io.h:120:55: note: in expansion of macro ‘RFILE’
 #define GetOpenFile(obj,fp) rb_io_check_closed((fp) = RFILE(rb_io_taint_check(obj))->fptr)
                                                       ^
bzip2.c:483:13: note: in expansion of macro ‘GetOpenFile’
             GetOpenFile(a, fptr);
             ^
In file included from /home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/backward/rubyio.h:6:0,
                 from bzip2.c:5:
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/io.h:179:6: note: expected ‘struct rb_io_t *’ but argument is of type ‘int *’
 void rb_io_check_closed(rb_io_t*);
      ^
bzip2.c:484:13: warning: passing argument 1 of ‘rb_io_check_writable’ from incompatible pointer type [enabled by default]
             rb_io_check_writable(fptr);
             ^
In file included from /home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/backward/rubyio.h:6:0,
                 from bzip2.c:5:
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/io.h:172:6: note: expected ‘struct rb_io_t *’ but argument is of type ‘int *’
 void rb_io_check_writable(rb_io_t*);
      ^
bzip2.c: In function ‘bz_reader_init’:
bzip2.c:698:13: error: unknown type name ‘OpenFile’
             OpenFile *fptr;
             ^
In file included from /home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/backward/rubyio.h:6:0,
                 from bzip2.c:5:
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/io.h:120:53: warning: assignment from incompatible pointer type [enabled by default]
 #define GetOpenFile(obj,fp) rb_io_check_closed((fp) = RFILE(rb_io_taint_check(obj))->fptr)
                                                     ^
bzip2.c:703:13: note: in expansion of macro ‘GetOpenFile’
             GetOpenFile(a, fptr);
             ^
In file included from /home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby.h:33:0,
                 from bzip2.c:1:
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/ruby.h:1107:30: warning: passing argument 1 of ‘rb_io_check_closed’ from incompatible pointer type [enabled by default]
 #define RFILE(obj)   (R_CAST(RFile)(obj))
                              ^
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/ruby.h:1093:30: note: in definition of macro ‘R_CAST’
 #define R_CAST(st)   (struct st*)
                              ^
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/io.h:120:55: note: in expansion of macro ‘RFILE’
 #define GetOpenFile(obj,fp) rb_io_check_closed((fp) = RFILE(rb_io_taint_check(obj))->fptr)
                                                       ^
bzip2.c:703:13: note: in expansion of macro ‘GetOpenFile’
             GetOpenFile(a, fptr);
             ^
In file included from /home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/backward/rubyio.h:6:0,
                 from bzip2.c:5:
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/io.h:179:6: note: expected ‘struct rb_io_t *’ but argument is of type ‘int *’
 void rb_io_check_closed(rb_io_t*);
      ^
bzip2.c:704:13: warning: passing argument 1 of ‘rb_io_check_readable’ from incompatible pointer type [enabled by default]
             rb_io_check_readable(fptr);
             ^
In file included from /home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/backward/rubyio.h:6:0,
                 from bzip2.c:5:
/home/misutowolf/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/io.h:173:6: note: expected ‘struct rb_io_t *’ but argument is of type ‘int *’
 void rb_io_check_readable(rb_io_t*);
      ^
bzip2.c: In function ‘bz_next_available’:
bzip2.c:779:18: warning: operation on ‘bzf->buf’ may be undefined [-Wsequence-point]
         bzf->buf = REALLOC_N(bzf->buf, char, bzf->buflen+BZ_RB_BLOCKSIZE+1);
                  ^
bzip2.c: In function ‘bz_reader_ungetc’:
bzip2.c:981:18: warning: operation on ‘bzf->buf’ may be undefined [-Wsequence-point]
         bzf->buf = REALLOC_N(bzf->buf, char, bzf->buflen + 2);
                  ^
bzip2.c: In function ‘bz_reader_ungets’:
bzip2.c:1025:18: warning: operation on ‘bzf->buf’ may be undefined [-Wsequence-point]
         bzf->buf = REALLOC_N(bzf->buf, char, bzf->buflen + RSTRING_LEN(a) + 1);
                  ^
bzip2.c: In function ‘Init_bzip2_ext’:
bzip2.c:1726:5: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
     VALUE bz_mBzip2Singleton = rb_singleton_class(bz_mBzip2);
     ^
make: *** [bzip2.o] Error 1