rails newを実行すると、Gem::Ext::BuildError: ERROR: Failed to build gem native extension.がでる。

Question

rails newを実行するとGem::Ext::BuildError: ERROR: Failed to build gem native extension.がでてしまいます。

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

    current directory: /Users/yoshinori/.rbenv/versions/2.5.0-dev/lib/ruby/gems/2.5.0/gems/ffi-1.9.21/ext/ffi_c
/Users/yoshinori/.rbenv/versions/2.5.0-dev/bin/ruby -r ./siteconf20180222-38898-1fxclyt.rb extconf.rb
checking for ffi.h... no
checking for ffi.h in /usr/local/include,/usr/include/ffi... no
checking for shlwapi.h... no
checking for rb_thread_blocking_region()... no
checking for rb_thread_call_with_gvl()... yes
checking for rb_thread_call_without_gvl()... yes
creating extconf.h
creating Makefile

current directory: /Users/yoshinori/.rbenv/versions/2.5.0-dev/lib/ruby/gems/2.5.0/gems/ffi-1.9.21/ext/ffi_c
make "DESTDIR=" clean

current directory: /Users/yoshinori/.rbenv/versions/2.5.0-dev/lib/ruby/gems/2.5.0/gems/ffi-1.9.21/ext/ffi_c
make "DESTDIR="
Running autoreconf for libffi
autoreconf: Entering directory `.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: aclocal --force -I m4
configure.ac:376: warning: AC_PROG_LD is m4_require'd but not m4_defun'd
acinclude.m4:333: LIBFFI_CHECK_LINKER_FEATURES is expanded from...
acinclude.m4:473: LIBFFI_ENABLE_SYMVERS is expanded from...
configure.ac:376: the top level
configure.ac:376: warning: AC_PROG_LD is m4_require'd but not m4_defun'd
acinclude.m4:333: LIBFFI_CHECK_LINKER_FEATURES is expanded from...
acinclude.m4:473: LIBFFI_ENABLE_SYMVERS is expanded from...
configure.ac:376: the top level
autoreconf: configure.ac: tracing
configure.ac:376: warning: AC_PROG_LD is m4_require'd but not m4_defun'd
acinclude.m4:333: LIBFFI_CHECK_LINKER_FEATURES is expanded from...
acinclude.m4:473: LIBFFI_ENABLE_SYMVERS is expanded from...
configure.ac:376: the top level
autoreconf: configure.ac: not using Libtool
autoreconf: running: /usr/local/Cellar/autoconf/2.69/bin/autoconf --force
configure.ac:376: warning: AC_PROG_LD is m4_require'd but not m4_defun'd
acinclude.m4:333: LIBFFI_CHECK_LINKER_FEATURES is expanded from...
acinclude.m4:473: LIBFFI_ENABLE_SYMVERS is expanded from...
configure.ac:376: the top level
configure.ac:41: error: possibly undefined macro: AC_PROG_LIBTOOL
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
configure:7612: error: possibly undefined macro: AC_PROG_LD
autoreconf: /usr/local/Cellar/autoconf/2.69/bin/autoconf failed with exit status: 1
make: *** ["/Users/yoshinori/.rbenv/versions/2.5.0-dev/lib/ruby/gems/2.5.0/gems/ffi-1.9.21/ext/ffi_c/libffi-x86_64-darwin16"/.libs/libffi_convenience.a] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/yoshinori/.rbenv/versions/2.5.0-dev/lib/ruby/gems/2.5.0/gems/ffi-1.9.21 for inspection.
Results logged to /Users/yoshinori/.rbenv/versions/2.5.0-dev/lib/ruby/gems/2.5.0/extensions/x86_64-darwin-16/2.5.0-static/ffi-1.9.21/gem_make.out

An error occurred while installing ffi (1.9.21), and Bundler cannot continue.
Make sure that `gem install ffi -v '1.9.21'` succeeds before bundling.

In Gemfile:
  selenium-webdriver was resolved to 3.9.0, which depends on
    childprocess was resolved to 0.8.0, which depends on
      ffi
         run  bundle exec spring binstub --all
* bin/rake: spring inserted
* bin/rails: spring inserted

```An error occurred while installing ffi (1.9.21), and Bundler cannot continue.
Make sure that `gem install ffi -v '1.9.21'` succeeds before bundling.と書いてあったので、gem install ffi -v '1.9.21'を実行したのですが、またエラーがでました。

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

current directory: /Users/yoshinori/.rbenv/versions/2.5.0-dev/lib/ruby/gems/2.5.0/gems/ffi-1.9.21/ext/ffi_c

/Users/yoshinori/.rbenv/versions/2.5.0-dev/bin/ruby -r ./siteconf20180222-39138-1mleso5.rb extconf.rb
checking for ffi.h... no
checking for ffi.h in /usr/local/include,/usr/include/ffi... no
checking for shlwapi.h... no
checking for rb_thread_blocking_region()... no
checking for rb_thread_call_with_gvl()... yes
checking for rb_thread_call_without_gvl()... yes
creating extconf.h
creating Makefile

current directory: /Users/yoshinori/.rbenv/versions/2.5.0-dev/lib/ruby/gems/2.5.0/gems/ffi-1.9.21/ext/ffi_c
make "DESTDIR=" clean

current directory: /Users/yoshinori/.rbenv/versions/2.5.0-dev/lib/ruby/gems/2.5.0/gems/ffi-1.9.21/ext/ffi_c
make "DESTDIR="
Running autoreconf for libffi
autoreconf: Entering directory `.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: aclocal --force -I m4
configure.ac:376: warning: AC_PROG_LD is m4_require'd but not m4_defun'd
acinclude.m4:333: LIBFFI_CHECK_LINKER_FEATURES is expanded from...
acinclude.m4:473: LIBFFI_ENABLE_SYMVERS is expanded from...
configure.ac:376: the top level
configure.ac:376: warning: AC_PROG_LD is m4_require'd but not m4_defun'd
acinclude.m4:333: LIBFFI_CHECK_LINKER_FEATURES is expanded from...
acinclude.m4:473: LIBFFI_ENABLE_SYMVERS is expanded from...
configure.ac:376: the top level
autoreconf: configure.ac: tracing
configure.ac:376: warning: AC_PROG_LD is m4_require'd but not m4_defun'd
acinclude.m4:333: LIBFFI_CHECK_LINKER_FEATURES is expanded from...
acinclude.m4:473: LIBFFI_ENABLE_SYMVERS is expanded from...
configure.ac:376: the top level
autoreconf: configure.ac: not using Libtool
autoreconf: running: /usr/local/Cellar/autoconf/2.69/bin/autoconf --force
configure.ac:376: warning: AC_PROG_LD is m4_require'd but not m4_defun'd
acinclude.m4:333: LIBFFI_CHECK_LINKER_FEATURES is expanded from...
acinclude.m4:473: LIBFFI_ENABLE_SYMVERS is expanded from...
configure.ac:376: the top level
configure.ac:41: error: possibly undefined macro: AC_PROG_LIBTOOL
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
configure:7612: error: possibly undefined macro: AC_PROG_LD
autoreconf: /usr/local/Cellar/autoconf/2.69/bin/autoconf failed with exit status: 1
make: *** ["/Users/yoshinori/.rbenv/versions/2.5.0-dev/lib/ruby/gems/2.5.0/gems/ffi-1.9.21/ext/ffi_c/libffi-x86_64-darwin16"/.libs/libffi_convenience.a] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/yoshinori/.rbenv/versions/2.5.0-dev/lib/ruby/gems/2.5.0/gems/ffi-1.9.21 for inspection.
Results logged to /Users/yoshinori/.rbenv/versions/2.5.0-dev/lib/ruby/gems/2.5.0/extensions/x86_64-darwin-16/2.5.0-static/ffi-1.9.21/gem_make.out

もう何が何だかさっぱりです。どなたかご教授お願いいたします。

Answer 1

ffi 1.9.21の互換性があまりよくなかったぽい。。
1.9.21以下のバージョンでインストールを試みたらうまくいった。