问题
Can seem to get around this.
$gem install ffi
Building native extensions. This could take a while...
ERROR: Error installing ffi:
ERROR: Failed to build gem native extension.
/remote/part/usern/.rvm/rubies/ruby-1.9.3-p448/bin/ruby extconf.rb
checking for ffi.h... no
checking for ffi.h in /usr/local/include,/usr/include/ffi... no
checking for rb_thread_blocking_region()... yes
checking for rb_thread_call_with_gvl()... yes
checking for rb_thread_call_without_gvl()... yes
checking for ffi_prep_cif_var()... no
creating extconf.h
creating Makefile
make
libffi.gnu.mk:16: Extraneous text after `else' directive
libffi.gnu.mk:18: *** only one `else' per conditional. Stop.
Gem files will remain installed in /remote/part/usern/.rvm/gems/ruby-1.9.3-p448@myrailsapp/gems/ffi-1.9.0 for inspection.
Results logged to /remote/part/usern/.rvm/gems/ruby-1.9.3-p448@myrailsapp/gems/ffi-1.9.0/ext/ffi_c/gem_make.out
Any ideas?
回答1:
try this before
sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2
apt-get install ruby{version}-dev
bundle install ffi
it worked for me
回答2:
I had to set the gcc to 4.2 and it worked. I also changed the ffi version to 1.0.9 in Gemfile.lock.
export PATH=/opt/gcc-4.2.0/bin/:$PATH
回答3:
Hi that's related with the GCC compiler i updated mine and also did the trick that Harpreet mentioned (ffi version downgrade) BUT it's not necessary ffi-1.9.3 worked just fine as well :D
in the Gemfile.lock
ffi (1.9.3)
ffi (1.9.3-x86-mingw32)
https://github.com/kennethreitz/osx-gcc-installer
click here github repo with the .pkg installer for all OS (not only MacOSX)
来源：https://stackoverflow.com/questions/18283291/error-installing-ffi