* Your CXXFLAGS contains "-fvisibility-inlines-hidden" which can break packages.
 * 
 * Before you file a bug, please remove these flags and 
 * re-compile the package in question as well as all its dependencies
>>> Unpacking source...
>>> Unpacking bz2-0.2.2.tar.gz to /var/tmp/portage/dev-ruby/ruby-bz2-0.2.2/work
>>> Source unpacked in /var/tmp/portage/dev-ruby/ruby-bz2-0.2.2/work
>>> Compiling source in /var/tmp/portage/dev-ruby/ruby-bz2-0.2.2/work/bz2-0.2.2 ...
checking for BZ2_bzWriteOpen() in -lbz2... yes
creating Makefile
make -j12 -s CC=x86_64-pc-linux-gnu-gcc CXX=x86_64-pc-linux-gnu-g++ 'DLDFLAGS=-Wl,-O1 -Wl,--as-needed -Wl,--hash-style=gnu -Wl,--sort-common' 
In file included from bz2.c:2:
/usr/include/ruby19-1.9.1/ruby/backward/rubyio.h:2:2: warning: #warning use "ruby/io.h" instead of "rubyio.h"
bz2.c:4:21: error: version.h: No such file or directory
bz2.c: In function ‘bz_raise’:
bz2.c:85: warning: format not a string literal and no format arguments
bz2.c: In function ‘bz_find_struct’:
bz2.c:112: error: ‘struct RArray’ has no member named ‘len’
bz2.c:113: error: ‘struct RArray’ has no member named ‘ptr’
bz2.c:113: error: ‘struct RArray’ has no member named ‘ptr’
bz2.c:116: error: ‘OpenFile’ undeclared (first use in this function)
bz2.c:116: error: (Each undeclared identifier is reported only once
bz2.c:116: error: for each function it appears in.)
bz2.c:116: error: expected expression before ‘)’ token
bz2.c: In function ‘bz_internal_finalize’:
bz2.c:218: error: ‘struct RArray’ has no member named ‘len’
bz2.c:219: error: ‘struct RArray’ has no member named ‘ptr’
bz2.c: In function ‘bz_io_data_finalize’:
bz2.c:304: error: ‘OpenFile’ undeclared (first use in this function)
bz2.c:304: error: ‘file’ undeclared (first use in this function)
bz2.c:304: error: expected expression before ‘)’ token
bz2.c: In function ‘bz_str_write’:
bz2.c:399: error: ‘struct RString’ has no member named ‘len’
bz2.c:400: error: ‘struct RString’ has no member named ‘ptr’
bz2.c:400: error: ‘struct RString’ has no member named ‘len’
bz2.c: In function ‘bz_writer_init’:
bz2.c:439: error: ‘OpenFile’ undeclared (first use in this function)
bz2.c:439: error: ‘fptr’ undeclared (first use in this function)
bz2.c: In function ‘bz_writer_write’:
bz2.c:510: error: ‘struct RString’ has no member named ‘ptr’
bz2.c:511: error: ‘struct RString’ has no member named ‘len’
bz2.c:526: error: ‘struct RString’ has no member named ‘len’
bz2.c: In function ‘bz_reader_init’:
bz2.c:617: error: ‘OpenFile’ undeclared (first use in this function)
bz2.c:617: error: ‘fptr’ undeclared (first use in this function)
bz2.c: In function ‘bz_next_available’:
bz2.c:694: error: ‘struct RString’ has no member named ‘len’
bz2.c:700: error: ‘struct RString’ has no member named ‘ptr’
bz2.c:701: error: ‘struct RString’ has no member named ‘len’
bz2.c: In function ‘bz_read_until’:
bz2.c:783: error: ‘struct RString’ has no member named ‘len’
bz2.c: In function ‘bz_reader_read’:
bz2.c:848: error: ‘struct RString’ has no member named ‘len’
bz2.c:849: error: ‘struct RString’ has no member named ‘len’
bz2.c: In function ‘bz_getc’:
bz2.c:871: error: ‘struct RString’ has no member named ‘len’
bz2.c:874: error: ‘struct RString’ has no member named ‘ptr’
bz2.c: In function ‘bz_reader_ungets’:
bz2.c:914: error: ‘struct RString’ has no member named ‘len’
bz2.c:915: error: ‘struct RString’ has no member named ‘len’
bz2.c:916: error: ‘struct RString’ has no member named ‘ptr’
bz2.c:916: error: ‘struct RString’ has no member named ‘len’
bz2.c:917: error: ‘struct RString’ has no member named ‘len’
bz2.c:920: error: ‘struct RString’ has no member named ‘len’
bz2.c:921: error: ‘struct RString’ has no member named ‘ptr’
bz2.c:921: error: ‘struct RString’ has no member named ‘len’
bz2.c:922: error: ‘struct RString’ has no member named ‘len’
bz2.c: In function ‘bz_reader_gets_internal’:
bz2.c:969: error: ‘struct RString’ has no member named ‘len’
bz2.c:970: error: ‘struct RString’ has no member named ‘ptr’
bz2.c:980: error: ‘struct RString’ has no member named ‘ptr’
bz2.c: In function ‘bz_reader_set_unused’:
bz2.c:1027: error: ‘struct RString’ has no member named ‘ptr’
bz2.c:1027: error: ‘struct RString’ has no member named ‘len’
bz2.c:1030: error: ‘struct RString’ has no member named ‘ptr’
bz2.c:1030: error: ‘struct RString’ has no member named ‘len’
bz2.c:1032: error: ‘struct RString’ has no member named ‘ptr’
bz2.c:1033: error: ‘struct RString’ has no member named ‘len’
bz2.c: In function ‘bz_reader_getc’:
bz2.c:1045: error: ‘struct RString’ has no member named ‘len’
bz2.c:1048: error: ‘struct RString’ has no member named ‘ptr’
bz2.c: In function ‘bz_str_read’:
bz2.c:1414: error: ‘struct RString’ has no member named ‘len’
bz2.c:1425: error: ‘struct RString’ has no member named ‘len’
bz2.c:1426: error: ‘struct RString’ has no member named ‘ptr’
bz2.c:1427: error: ‘struct RString’ has no member named ‘len’
bz2.c:1431: error: ‘struct RString’ has no member named ‘ptr’
make: *** [bz2.o] Error 1
 * ERROR: dev-ruby/ruby-bz2-0.2.2 failed:
 *   emake for ruby failed
 * 
 * Call stack:
 *     ebuild.sh, line   49:  Called src_compile
 *   environment, line 2583:  Called ruby_src_compile
 *   environment, line 2527:  Called ruby_emake
 *   environment, line 2506:  Called die
 * The specific snippet of code:
 *           emake CC="$(tc-getCC)" CXX="$(tc-getCXX)" DLDFLAGS="${LDFLAGS}" "$@" || die "emake for ruby failed";
 * 
 * If you need support, post the output of 'emerge --info =dev-ruby/ruby-bz2-0.2.2',
 * the complete build log and the output of 'emerge -pqv =dev-ruby/ruby-bz2-0.2.2'.
 * The complete build log is located at '/var/log/portage/dev-ruby:ruby-bz2-0.2.2:20091107-001355.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-ruby/ruby-bz2-0.2.2/temp/environment'.
 * S: '/var/tmp/portage/dev-ruby/ruby-bz2-0.2.2/work/bz2-0.2.2'