installing mongrel

[fcuk112]

when i do sudo gem install mongrel i get the following:

Building native extensions. This could take a while... ERROR: Error installing mongrel: ERROR: Failed to build gem native extension. /usr/local/bin/ruby extconf.rb checking for main() in -lc... yes creating Makefile make gcc -I. -I/usr/local/include/ruby-1.9.1/i686-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -D_FILE_OFFSET_BITS=64 -fPIC -O2 -g -Wall -Wno-parentheses -o http11_parser.o -c http11_parser.c gcc -I. -I/usr/local/include/ruby-1.9.1/i686-linux -I/usr/local/include/ruby-1.9.1/ruby/backward -I/usr/local/include/ruby-1.9.1 -I. -D_FILE_OFFSET_BITS=64 -fPIC -O2 -g -Wall -Wno-parentheses -o http11.o -c http11.c http11.c: In function ‘http_field’: http11.c:70: warning: format not a string literal and no format arguments http11.c:71: warning: format not a string literal and no format arguments http11.c:77: error: ‘struct RString’ has no member named ‘ptr’ http11.c:77: error: ‘struct RString’ has no member named ‘len’ http11.c:77: warning: left-hand operand of comma expression has no effect http11.c: In function ‘request_uri’: http11.c:102: warning: format not a string literal and no format arguments http11.c: In function ‘fragment’: http11.c:113: warning: format not a string literal and no format arguments http11.c: In function ‘request_path’: http11.c:124: warning: format not a string literal and no format arguments http11.c: In function ‘query_string’: http11.c:135: warning: format not a string literal and no format arguments http11.c: In function ‘header_done’: http11.c:172: error: ‘struct RString’ has no member named ‘ptr’ http11.c:172: error: ‘struct RString’ has no member named ‘ptr’ http11.c:172: error: ‘struct RString’ has no member named ‘ptr’ http11.c:174: error: ‘struct RString’ has no member named ‘ptr’ http11.c:176: error: ‘struct RString’ has no member named ‘ptr’ http11.c:177: error: ‘struct RString’ has no member named ‘len’ http11.c: In function ‘HttpParser_execute’: http11.c:298: error: ‘struct RString’ has no member named ‘ptr’ http11.c:299: error: ‘struct RString’ has no member named ‘len’ http11.c:307: warning: format not a string literal and no format arguments make: *** [http11.o] Error 1 Gem files will remain installed in /usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.5 for inspection. Results logged to /usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.5/ext/http11/gem_make.out

any idea?