ext/extconf.rb in gmp-0.6.47 vs ext/extconf.rb in gmp-0.7.19

@@ -41,17 +41,25 @@
 if (begin; JRuby; rescue NameError; end) != nil
   $CFLAGS += ' -DRUBY_ENGINE_JRUBY'
 end
 
 
+# This test is actually due to a Clang 3.3 shortcoming, included in OS X 10.9,
+# fixed in Clang 3.4:
+# http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html#new-compiler-flags
 if try_compile('', '-O6')
   $CFLAGS += ' -Wall -W -O6 -g'
 else
   $CFLAGS += ' -Wall -W -O3 -g'
 end
 
 if ok
   create_makefile('gmp')
 else
+  $stderr.puts "*********************************************************************"
+  $stderr.puts "Your compiler was unable to link to GMP while installing the gmp gem."
+  $stderr.puts "Please install GMP before installing the gmp gem."
+  $stderr.puts "*********************************************************************"
+
   raise "Unable to build, correct above errors and rerun"
 end