Ffi log file

pkg-config --exists libffi"                                | pkg-config --libs libffi                                  => "-lffi\n"                                                "gcc -o conftest -I/usr/include -I/usr/include/ruby/backward -I/usr/include -I.    -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fPIC conftest.c  -L. -L/usr/lib64 -L. -Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -fstack-protector -rdynamic -Wl,-export-dynamic     -lruby  -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 */