I am getting following exception while installing rails in Opensuse.
Version of Ruby is ruby 2.1.3p242 (2014-09-19 revision 47630) [x86_64-linux-gnu]
/usr/lib64/ruby/gems/2.1.0/gems/nokogiri-1.6.8/test/xslt/test_custom_functions.rb
/usr/lib64/ruby/gems/2.1.0/gems/nokogiri-1.6.8/test/xslt/test_exception_handling.rb
/usr/lib64/ruby/gems/2.1.0/gems/nokogiri-1.6.8/test_all
Building native extensions. This could take a while...
current directory: /usr/lib64/ruby/gems/2.1.0/gems/nokogiri-1.6.8/ext/nokogiri
/usr/bin/ruby.ruby2.1 -r ./siteconf20160625-7943-34np6o.rb extconf.rb
Using pkg-config version 1.1.7
checking if the C compiler accepts ... *** 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}/lib64
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/bin/ruby.ruby2.1
--help
--clean
/usr/lib64/ruby/2.1.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /usr/lib64/ruby/2.1.0/mkmf.rb:571:in `block in try_compile'
from /usr/lib64/ruby/2.1.0/mkmf.rb:522:in `with_werror'
from /usr/lib64/ruby/2.1.0/mkmf.rb:571:in `try_compile'
from extconf.rb:138:in `nokogiri_try_compile'
from extconf.rb:162:in `block in add_cflags'
from /usr/lib64/ruby/2.1.0/mkmf.rb:621:in `with_cflags'
from extconf.rb:161:in `add_cflags'
from extconf.rb:414:in `<main>'
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
Building has failed. See above output for more information on the failure.
要查看此扩展无法编译的原因，请查看mkmf.log，可在此处找到：
/usr/lib64/ruby/gems/2.1.0/extensions/x86_64-linux/2.1.0/nokogiri-1.6.8/mkmf.log
extconf失败，退出代码1
mkmf.log的内容如下：
gcc -o conftest -I/usr/include/ruby-2.1.0/x86_64-linux-gnu -I/usr/include /ruby-2.1.0/ruby/backward -I/usr/include/ruby-2.1.0 -I. -fmessage-length=0 -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -fno-strict-aliasing -fPIC conftest.c -L. -L/usr/lib64 -L. -fstack-protector -rdynamic -Wl,-export-dynamic -lruby2.1 -lpthread -ldl -lcrypt -lm -lc "
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5: return 0;
6: }
/* end */