Centos7　redmine導入

virtualboxにCentos7を入れました。
そこにredmineを導入しようと思い、
http://blog.redmine.jp/articles/3_2/install/centos/
の記事を参考に進めてみました。

しかしPassengerのインストールのところでエラーが起きて進まなくなってしまいました。

PassengerのApache用モジュールのインストールの
passenger-install-apache2-module --auto

を実行すると

In file included from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/os_defines.h:39:,
                 from /usr/include/c++/4.8.2/x86_64-redhat-linux/bits/c++config.h:2097,
                 from /usr/include/c++/4.8.2/string:38,
                 from src/cxx_supportlib/oxt/detail/tracable_exception_enabled.hpp:25,
                 from src/cxx_supportlib/oxt/tracable_exception.hpp:31,
                 from src/cxx_supportlib/Exceptions.h:62,
                 from src/cxx_supportlib/Exceptions.cpp:27:
/usr/include/features.h:330:4: 警告: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
mkdir -p buildout/apache2/module_libpassenger_common/Utils
c++ -o buildout/apache2/module_libpassenger_common/Utils/SystemTime.o  -Isrc/cxx_supportlib -Isrc/cxx_supportlib/vendor-copy -Isrc/cxx_supportlib/vendor-modified -Isrc/cxx_supportlib/vendor-modified/libev -Isrc/cxx_supportlib/vendor-copy/libuv/include -fPIC -DLINUX -D_REENTRANT -D_GNU_SOURCE -I/usr/include/apr-1 -I/usr/include/apr-1 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -I/usr/include/httpd -D_REENTRANT -I/usr/local/include -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-long-long -Wno-missing-field-initializers -feliminate-unused-debug-symbols -feliminate-unused-debug-types -fvisibility=hidden -DVISIBILITY_ATTRIBUTE_SUPPORTED -g -DHAS_ALLOCA_H -DHAVE_ACCEPT4 -DHAS_SFENCE -DHAS_LFENCE -DPASSENGER_DEBUG -DBOOST_DISABLE_ASSERTS -std=gnu++11 -Wno-unused-local-typedefs -DHASH_NAMESPACE="__gnu_cxx" -DHASH_MAP_HEADER="<hash_map>" -DHASH_MAP_CLASS="hash_map" -DHASH_FUN_H="<hash_fun.h>" -c src/cxx_supportlib/Utils/SystemTime.cpp


In file included from src/agent/Shared/ApiServerUtils.h:73:0,
                 from src/agent/Watchdog/WatchdogMain.cpp:63:
src/cxx_supportlib/DataStructures/LString.h:83:2: 警告: always_inline function might not be inlinable [-Wattributes]
  psg_lstr_last_byte(const LString *str) {
  ^
src/cxx_supportlib/DataStructures/LString.h:78:2: 警告: always_inline function might not be inlinable [-Wattributes]
  psg_lstr_first_byte(const LString *str) {
  ^
c++ -o buildout/support-binaries/CoreMain.o  -Isrc/agent -Isrc/cxx_supportlib -Isrc/cxx_supportlib/vendor-copy -Isrc/cxx_supportlib/vendor-modified -Isrc/cxx_supportlib/vendor-modified/libev -Isrc/cxx_supportlib/vendor-copy/libuv/include -D_REENTRANT -I/usr/local/include -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-long-long -Wno-missing-field-initializers -feliminate-unused-debug-symbols -feliminate-unused-debug-types -fvisibility=hidden -DVISIBILITY_ATTRIBUTE_SUPPORTED -g -DHAS_ALLOCA_H -DHAVE_ACCEPT4 -DHAS_SFENCE -DHAS_LFENCE -DPASSENGER_DEBUG -DBOOST_DISABLE_ASSERTS -std=gnu++11 -Wno-unused-local-typedefs -DHASH_NAMESPACE="__gnu_cxx" -DHASH_MAP_HEADER="<hash_map>" -DHASH_MAP_CLASS="hash_map" -DHASH_FUN_H="<hash_fun.h>" -c src/agent/Core/CoreMain.cpp
In file included from src/agent/Shared/ApiServerUtils.h:73:0,
                 from src/agent/Core/CoreMain.cpp:73:

という文が(一部省略しています）ループで表示されて先に進みません。
/usr/include/features.h:330:4: 警告: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
warning _FORTIFY_SOURCE requires compiling with optimization (-O)
がいけないのかと思うのですがどうしたら解決できるかわかりません。何がいけないのでしょうか。