ruby 1.9をインスコしたのですが，mechanizeでこけます。
対策教えて下さい。
ruby 1.9はMacOS 10.3 PPC G3です。
$ ./configure --prefix=/opt/local --program-suffix=19
checking build system type... powerpc-apple-darwin7.9.0
checking host system type... powerpc-apple-darwin7.9.0
checking target system type... powerpc-apple-darwin7.9.0
checking for gcc... gcc

$ sudo gem19 install mechanize
Password:
Building native extensions.  This could take a while...
ERROR:  Error installing mechanize:
        ERROR: Failed to build gem native extension.

/opt/local/bin/ruby19 extconf.rb install mechanize
checking for main() in -lc... yes
creating Makefile

make
gcc -I. -I/opt/local/include/ruby-1.9.0/powerpc-darwin7.9.0 -I/opt/local/include/ruby-1.9.0 -I.   -fno-common -g -O2 -pipe -fno-common   -o hpricot_scan.o -c hpricot_scan.c
ext/hpricot_scan/hpricot_scan.rl: In function `hpricot_scan':
ext/hpricot_scan/hpricot_scan.rl:172: error: structure has no member named `ptr'
ext/hpricot_scan/hpricot_scan.rl:185: error: structure has no member named `ptr'
ext/hpricot_scan/hpricot_scan.rl:185: error: structure has no member named `len'
ext/hpricot_scan/hpricot_scan.rl:186: error: structure has no member named `len'
ext/hpricot_scan/hpricot_scan.rl:202: error: structure has no member named `ptr'
make: *** [hpricot_scan.o] Error 1


Gem files will remain installed in /opt/local/lib/ruby/gems/1.9.0/gems/hpricot-0.6 for inspection.
Results logged to /opt/local/lib/ruby/gems/1.9.0/gems/hpricot-0.6/ext/hpricot_scan/gem_make.out