Merge pull request #339 from gnprice/fix-shorten-workaround

Fix build failure when clang installed and not used

bin/ruby-build

@@ -662,11 +662,10 @@ else
   TMP="${TMPDIR%/}"
 fi
 
-# Work around warnings building Ruby 2.0 on Clang 2.x
-if type clang &>/dev/null; then
-  if "${CC:-clang}" -x c /dev/null -E -Wno-error=shorten-64-to-32 &>/dev/null; then
-    RUBY_CFLAGS="$RUBY_CFLAGS -Wno-error=shorten-64-to-32"
-  fi
+# Work around warnings building Ruby 2.0 on Clang 2.x:
+# pass -Wno-error=shorten-64-to-32 if the compiler accepts it.
+if "${CC:-cc}" -x c /dev/null -E -Wno-error=shorten-64-to-32 &>/dev/null; then
+  RUBY_CFLAGS="$RUBY_CFLAGS -Wno-error=shorten-64-to-32"
 fi
 
 if [ -z "$MAKE" ]; then