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Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

C:/RailsInstaller/Ruby2.1.0/bin/ruby.exe extconf.rb
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
generating kdtree-i386-mingw32.def
compiling kdtree.c
kdtree.c: In function 'kdtree_nearest0':
kdtree.c:221:13: error: expected identifier or '(' before ',' token
kdtree.c:237:14: error: expected expression before '=' token
kdtree.c:237:29: error: expected expression before '=' token
kdtree.c:239:14: error: expected expression before '=' token
kdtree.c:239:30: error: expected expression before '=' token
kdtree.c:241:34: error: expected expression before ',' token
kdtree.c:241:34: error: too few arguments to function 'kdtree_nearest0'
kdtree.c:217:13: note: declared here
kdtree.c:243:37: error: expected expression before ',' token
kdtree.c:243:37: error: too few arguments to function 'kdtree_nearest0'
kdtree.c:217:13: note: declared here
kdtree.c: In function 'kdtree_nearestk0':
kdtree.c:313:13: error: expected identifier or '(' before ',' token
kdtree.c:330:14: error: expected expression before '=' token
kdtree.c:330:29: error: expected expression before '=' token
kdtree.c:332:14: error: expected expression before '=' token
kdtree.c:332:30: error: expected expression before '=' token
kdtree.c:334:35: error: expected expression before ',' token
kdtree.c:334:35: error: too few arguments to function 'kdtree_nearestk0'
kdtree.c:309:13: note: declared here
kdtree.c:336:38: error: expected expression before ',' token
kdtree.c:336:38: error: too few arguments to function 'kdtree_nearestk0'
kdtree.c:309:13: note: declared here
kdtree.c: In function 'kdtree_persist':
kdtree.c:409:11: warning: unused variable 'str' [-Wunused-variable]
make: *** [kdtree.o] Error 1

make failed, exit code 2

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

    /Users/jero/.rvm/rubies/ruby-2.0.0-p247/bin/ruby extconf.rb
creating Makefile

make "DESTDIR="
compiling kdtree.c
In file included from kdtree.c:1:
In file included from /Users/jero/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby.h:33:
/Users/jero/.rvm/rubies/ruby-2.0.0-p247/include/ruby-2.0.0/ruby/ruby.h:51:11: fatal error: 'string.h' file not found
# include <string.h>
          ^
1 error generated.
make: *** [kdtree.o] Error 1