hypergeometric compilation errors

rake compile output

mkdir -p tmp/x86_64-darwin12.4.0/hypergeometric/2.0.0
cd tmp/x86_64-darwin12.4.0/hypergeometric/2.0.0
/Users/jwoods/.rbenv/versions/2.0.0-p195/bin/ruby -I. ../../../../ext/hypergeometric/extconf.rb
creating Makefile
cd -
cd tmp/x86_64-darwin12.4.0/hypergeometric/2.0.0
make
gcc -fno-common  -O3 -Wno-error=shorten-64-to-32  -pipe  -I'/Users/jwoods/.rbenv/versions/2.0.0-p195/include'  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT     ../../../../ext/hypergeometric/hypergeometric.c ../../../../ext/hypergeometric/hypergeometric.h /Users/jwoods/.rbenv/versions/2.0.0-p195/include/ruby-2.0.0/ruby.h /Users/jwoods/.rbenv/versions/2.0.0-p195/include/ruby-2.0.0/ruby/defines.h /Users/jwoods/.rbenv/versions/2.0.0-p195/include/ruby-2.0.0/x86_64-darwin12.4.0/ruby/config.h   -o hypergeometric
../../../../ext/hypergeometric/hypergeometric.c:1:18: error: ruby.h: No such file or directory
../../../../ext/hypergeometric/hypergeometric.c:6: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘cHypergeometric’
../../../../ext/hypergeometric/hypergeometric.c: In function ‘Init_hypergeometric’:
../../../../ext/hypergeometric/hypergeometric.c:50: error: ‘cHypergeometric’ undeclared (first use in this function)
../../../../ext/hypergeometric/hypergeometric.c:50: error: (Each undeclared identifier is reported only once
../../../../ext/hypergeometric/hypergeometric.c:50: error: for each function it appears in.)
../../../../ext/hypergeometric/hypergeometric.h:3:18: error: ruby.h: No such file or directory
In file included from /Users/jwoods/.rbenv/versions/2.0.0-p195/include/ruby-2.0.0/ruby.h:33:
/Users/jwoods/.rbenv/versions/2.0.0-p195/include/ruby-2.0.0/ruby/ruby.h:1656:24: error: ruby/subst.h: No such file or directory
In file included from /Users/jwoods/.rbenv/versions/2.0.0-p195/include/ruby-2.0.0/ruby.h:33:
/Users/jwoods/.rbenv/versions/2.0.0-p195/include/ruby-2.0.0/ruby/ruby.h:1718: error: conflicting types for ‘ruby_process_options’
/System/Library/Frameworks/ruby.framework/Headers/intern.h:409: error: previous declaration of ‘ruby_process_options’ was here
make: *** [hypergeometric] Error 1
rake aborted!
Command failed with status (2): [make...]

Tasks: TOP => compile => compile:x86_64-darwin12.4.0 => compile:hypergeometric:x86_64-darwin12.4.0 => copy:hypergeometric:x86_64-darwin12.4.0:2.0.0 => tmp/x86_64-darwin12.4.0/hypergeometric/2.0.0/hypergeometric.bundle
(See full trace by running task with --trace)

weird output

cd tmp/x86_64-darwin12.4.0/hypergeometric/2.0.0
make
linking shared-object hypergeometric.bundle
ld: warning: ignoring file hypergeometric, file was built for unsupported file format ( 0x67 0x70 0x63 0x68 0x43 0x30 0x31 0x33 0x38 0x4b 0x73 0x92 0x3d 0xf1 0xa5 0x62 ) which is not the architecture being linked (x86_64): hypergeometric
cd -
install -c tmp/x86_64-darwin12.4.0/hypergeometric/2.0.0/hypergeometric.bundle lib//hypergeometric.bundle