"gcc -o conftest -I/usr/include/ruby-2.3.0/x86_64-linux -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -D_FORTIFY_SOURCE=2   -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fPIC conftest.c  -L. -L/usr/lib -L. -Wl,-O1,--sort-common,--as-needed,-z,relro -fstack-protector -rdynamic -Wl,-export-dynamic     -lruby  -lpthread -lgmp -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 */

