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package configuration for libffi is not found
have_header: checking for ffi.h... -------------------- no
"/usr/local/opt/gcc46/bin/gcc-4.6 -o conftest -I/Users/USERNAME/.rvm/rubies/ruby-1.9.3-p545/include/ruby-1.9.1/x86_64-darwin12.5.0 -I/Users/USERNAME/.rvm/rubies/ruby-1.9.3-p545/include/ruby-1.9.1/ruby/backward -I/Users/USERNAME/.rvm/rubies/ruby-1.9.3-p545/include/ruby-1.9.1 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/usr/local/opt/libyaml/include -I/usr/local/opt/readline/include -I/usr/local/opt/libksba/include -I/usr/local/opt/openssl/include -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration -fno-common -pipe conftest.c -L. -L/Users/USERNAME/.rvm/rubies/ruby-1.9.3-p545/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/openssl/lib -L. -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local
/Users/USERNAME/.rvm/rubies/ruby-1.9.3-p545/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
configure: WARNING: you should use --build, --host, --target
configure: WARNING: you should use --build, --host, --target
configure: WARNING: you should use --build, --host, --target
configure: creating cache auto/config.cache
checking whether make sets $(MAKE)... yes
checking for gcc... /usr/bin/clang
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
configure: WARNING: you should use --build, --host, --target
configure: WARNING: you should use --build, --host, --target
configure: WARNING: you should use --build, --host, --target
configure: creating cache auto/config.cache
checking whether make sets $(MAKE)... yes
checking for gcc... /usr/bin/clang
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no