extconf.rb in fasttext-0.2.3

- old
+ new

@@ -1,8 +1,10 @@
 require "mkmf-rice"
 
+# -march=native not supported with ARM Mac
+default_optflags = RbConfig::CONFIG["host_os"] =~ /darwin/i && RbConfig::CONFIG["host_cpu"] =~ /arm/i ? "" : "-march=native"
 # -pthread and -O3 set by default
-$CXXFLAGS << " -std=c++17 $(optflags) -funroll-loops " << with_config("optflags", "-march=native")
+$CXXFLAGS << " -std=c++17 $(optflags) -funroll-loops " << with_config("optflags", default_optflags)
 
 ext = File.expand_path(".", __dir__)
 fasttext = File.expand_path("../../vendor/fastText/src", __dir__)
 
 $srcs = Dir["{#{ext},#{fasttext}}/*.{cc,cpp}"]