/usr/local/bin/ruby extconf.rb 
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling html_smartypants.c
html_smartypants.c: In function ‘squote_len’:
html_smartypants.c:92: 警告: initialization discards qualifiers from pointer target type
html_smartypants.c:92: 警告: initialization discards qualifiers from pointer target type
html_smartypants.c:92: 警告: initialization discards qualifiers from pointer target type
html_smartypants.c:92: 警告: initialization discards qualifiers from pointer target type
html_smartypants.c: In function ‘smartypants_squote’:
html_smartypants.c:137: 警告: 符合付きと符合無しとの比較です
html_smartypants.c: In function ‘smartypants_cb__amp’:
html_smartypants.c:232: 警告: ISO C90 forbids mixed declarations and code
compiling html.c
html.c: In function ‘rndr_header’:
html.c:290: 警告: passing argument 1 of ‘header_anchor’ discards qualifiers from pointer target type
html.c: In function ‘toc_header’:
html.c:638: 警告: passing argument 1 of ‘header_anchor’ discards qualifiers from pointer target type
html.c: In function ‘rndr_blockcode’:
html.c:129: 警告: ‘cls’ is used uninitialized in this function
compiling rc_render.c
rc_render.c: In function ‘rb_redcarpet__overload’:
rc_render.c:393: 警告: dereferencing type-punned pointer will break strict-aliasing rules
rc_render.c:394: 警告: dereferencing type-punned pointer will break strict-aliasing rules
compiling autolink.c
compiling houdini_href_e.c
compiling rc_markdown.c
compiling markdown.c
markdown.c: In function ‘char_link’:
markdown.c:1042: 警告: ISO C90 forbids mixed declarations and code
markdown.c:1082: 警告: ISO C90 forbids mixed declarations and code
markdown.c: In function ‘sd_markdown_render’:
markdown.c:2812: 警告: ISO C90 forbids mixed declarations and code
markdown.c: トップレベル:
markdown.c:90: 警告: ‘char_underline’ declared ‘static’ but never defined
markdown.c:91: 警告: ‘char_highlight’ declared ‘static’ but never defined
compiling stack.c
compiling buffer.c
compiling houdini_html_e.c
linking shared-object redcarpet.so

make "DESTDIR=" install
/usr/bin/install -c -m 0755 redcarpet.so ./.gem.20141021-32143-1mgngb4
installing default redcarpet libraries