问题:

Last week I made an update in cygwin because of the bash "vulnerable problem".
After that I couldn't compile sass anymore.
I tried to reinstall ruby, after some install fails and reinstalling cygwin I installed it and updated with
"gem update --system"
it run, but when I tried to install compass I got following message:

> /usr/bin/ruby.exe -r ./siteconf20141006-7856-1td7wzb.rb extconf.rb  > checking for ffi.h... *** extconf.rb failed ***  Could not create > Makefile due to some reason, probably lack of necessary  libraries > and/or headers. Check the mkmf.log file for more details. You may  > need configuration options. >  > Provided configuration options:  > --with-opt-dir  > --without-opt-dir  > --with-opt-include  > --without-opt-include=${opt-dir}/include  > --with-opt-lib  > --without-opt-lib=${opt-dir}/lib  > --with-make-prog  > --without-make-prog  > --srcdir=.  > --curdir  > --ruby=/usr/bin/ruby  > --with-ffi_c-dir  > --without-ffi_c-dir  > --with-ffi_c-include  > --without-ffi_c-include=${ffi_c-dir}/include  > --with-ffi_c-lib  > --without-ffi_c-lib=${ffi_c-dir}/  > --with-libffi-config  > --without-libffi-config  > --with-pkg-config  > --without-pkg-config  /usr/share/ruby/2.0.0/mkmf.rb:434:in `try_do': The compiler failed to generate an executable file. (RuntimeError)  > You have to install development tools first.  from > /usr/share/ruby/2.0.0/mkmf.rb:565:in `try_cpp'  from > /usr/share/ruby/2.0.0/mkmf.rb:1044:in `block in have_header'  from > /usr/share/ruby/2.0.0/mkmf.rb:895:in `block in checking_for'  from > /usr/share/ruby/2.0.0/mkmf.rb:340:in `block (2 levels) in postpone'  > from /usr/share/ruby/2.0.0/mkmf.rb:310:in `open'  from > /usr/share/ruby/2.0.0/mkmf.rb:340:in `block in postpone'  from > /usr/share/ruby/2.0.0/mkmf.rb:310:in `open'  from > /usr/share/ruby/2.0.0/mkmf.rb:336:in `postpone'  from > /usr/share/ruby/2.0.0/mkmf.rb:894:in `checking_for'  from > /usr/share/ruby/2.0.0/mkmf.rb:1043:in `have_header'  from > extconf.rb:16:in `<main>' >  > extconf failed, exit code 1

I tried to install ffi ("gem install ffi" and "gem install ffi --pre"),I got the same message

here is the log (.gem/ruby/extensions/x86_64-cygwin/ffi-1.9.5/gem_make.out)

package configuration for libffi is not found  "gcc -o conftest.exe -I/usr/include/ruby-2.0.0 -I/usr/include/ruby-2.0.0/ruby/backward -I/usr/include/ruby-2.0.0 -I. -ggdb -O2 -pipe -Wimplicit-function-declaration conftest.c -L. -L/usr/lib -L. -fstack-protector -lruby200 -lpthread -lrt -ldl -lcrypt "  checked program was:  /* begin */  1: #include "ruby.h"  2:  3: int main(int argc, char **argv)  4: {  5: return 0;  6: }  /* end */

I'm really frustrated!!'

system Windows 7 64bit Cygwin

回答1:

Yep, for me it's just the gcc environment,so you can try

sudo apt-get install gcc

That worked for me in ubuntu :)

回答2:

make sure that xcode is installed.

xcode-select --install

if it is already installed, make sure that you have accepted the TOS.

sudo xcodebuild -license

scroll down to the bottom and type agree.

it should work with above steps.

if you see following issue after doing above 2 steps

ERROR: While executing gem ... (Errno::EPERM) Operation not permitted - /usr/bin/compass

try following.

sudo su sudo gem install -n /usr/local/bin compass

回答3:

On OSX this worked:

if gem install compass fails, try

gem install ffi in case that also fails, the error seems to be, that the ffi build looks in /usr/bin for gcc-4.2

if you have gcc installed, just create a symlink within /usr/bin by typing

sudo ln -s gcc gcc-4.2

otherwise you may need to first install gcc (google that)

回答4:

try this out:

download and install ruby dev kit as per your ruby version

http://rubyinstaller.org/downloads/

in case of any issue follow this wiki on github.

https://github.com/oneclick/rubyinstaller/wiki/Development-Kit

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