Ruby2.5.0をインストールできない

Rubyの２．５．０をXserverにインストールしようと思っていますが、うまくできませんでした。
尚、下記の方法でRuby2.3.3はインストールできました。

初心者なのでわかりやすく教えていただけると助かります。
どうぞよろしくお願いいたします。

makeでのエラー

ruby
1CC = gcc
2	LD = ld
3	LDSHARED = gcc -shared
4	CFLAGS = -O3 -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wimplicit-int -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -Wdeprecated-declarations -std=gnu99 
5	XCFLAGS = -D_FORTIFY_SOURCE=2 -fstack-protector -fvisibility=hidden -DRUBY_EXPORT -fPIE
6	CPPFLAGS =   -I. -I.ext/include/x86_64-linux -I./include -I. -I./enc/unicode/10.0.0
7	DLDFLAGS = -fstack-protector -pie  
8	SOLIBS = 
9	LANG = ja_JP.UTF-8
10	LC_ALL = 
11	LC_CTYPE = 
12gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-55)
13Copyright (C) 2006 Free Software Foundation, Inc.
14This is free software; see the source for copying conditions.  There is NO
15warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16
17compiling ./main.c
18compiling dmydln.c
19compiling miniinit.c
20compiling dmyext.c
21compiling miniprelude.c
22making dummy probes.h
23compiling array.c
24compiling bignum.c
25bignum.c: In function ‘rb_int_powm’:
26bignum.c:7083: 警告: control reaches end of non-void function
27bignum.c: In function ‘bary_mul_balance_with_mulfunc’:
28./include/ruby/ruby.h:1636: 警告: ‘size’ may be used uninitialized in this function
29bignum.c: In function ‘bary_mul_karatsuba’:
30./include/ruby/ruby.h:1636: 警告: ‘size’ may be used uninitialized in this function
31bignum.c: In function ‘bary_mul_toom3’:
32./include/ruby/ruby.h:1636: 警告: ‘size’ may be used uninitialized in this function
33bignum.c: In function ‘bary_divmod_normal’:
34./include/ruby/ruby.h:1636: 警告: ‘size’ may be used uninitialized in this function
35./include/ruby/ruby.h:1636: 警告: ‘size’ may be used uninitialized in this function
36./include/ruby/ruby.h:1636: 警告: ‘size’ may be used uninitialized in this function
37./include/ruby/ruby.h:1636: 警告: ‘size’ may be used uninitialized in this function
38bignum.c: In function ‘big2str_generic’:
39./include/ruby/ruby.h:1636: 警告: ‘size’ may be used uninitialized in this function
40bignum.c: In function ‘str2big_karatsuba’:
41./include/ruby/ruby.h:1636: 警告: ‘size’ may be used uninitialized in this function
42compiling class.c
43class.c: In function ‘move_refined_method’:
44class.c:955: 警告: dereferencing type-punned pointer will break strict-aliasing rules
45compiling compar.c
46compiling compile.c
47compile.c: In function ‘add_insn_info’:
48compile.c:1864: 警告: control reaches end of non-void function
49compiling complex.c
50complex.c: In function ‘parse_comp’:
51./include/ruby/ruby.h:1636: 警告: ‘size’ may be used uninitialized in this function
52compiling cont.c
53cont.c: In function ‘rb_fiber_start’:
54cont.c:1450: 警告: ‘noreturn’ function does return
55compiling debug.c
56compiling debug_counter.c
57compiling dir.c
58dir.c: In function ‘nogvl_opendir_at’:
59dir.c:1444: error: ‘O_CLOEXEC’ undeclared (first use in this function)
60dir.c:1444: error: (Each undeclared identifier is reported only once
61dir.c:1444: error: for each function it appears in.)
62make: *** [dir.o] エラー 1