OSX ruby-filemagic-0.6.2 build failure log

mkmf.log

"gcc -o conftest -I/Users/me/.rvm/rubies/ruby-2.2.0/include/ruby-2.2.0/x86_64-darwin14 -I/Users/me/.rvm/rubies/ruby-2.2.0/include/ruby-2.2.0/ruby/backward -I/Users/me/.rvm/rubies/ruby-2.2.0/include/ruby-2.2.0 -I. -I/usr/local/include  -I/usr/local/opt/libyaml/include -I/usr/local/opt/readline/include -I/usr/local/opt/libksba/include -I/usr/local/opt/openssl/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT    -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wunused-variable -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -Wdivision-by-zero -Wdeprecated-declarations -Wextra-tokens  -fno-common -pipe conftest.c  -L/usr/local/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/Users/me/.rvm/rubies/ruby-2.2.0/lib -L. -fstack-protector -L/usr/local/opt/libyaml/lib -L/usr/local/opt/readline/lib -L/usr/local/opt/libksba/lib -L/usr/local/opt/openssl/lib  -static-libgcc     -lruby.2.2.0  -lpthread -lgmp -ldl -lobjc "
clang: error: unsupported option '-static-libgcc'
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: int main(int argc, char **argv)
4: {
5:   return 0;
6: }
/* end */