fixed conflict with upstream

bin/ruby-build

@@ -6,6 +6,8 @@
 #   -k/--keep        Do not remove source tree after installation
 #   -v/--verbose     Verbose mode: print compilation status to stdout
 #   -p/--patch       Apply a patch from stdin before building
+#   -4/--ipv4        Resolve names to IPv4 addresses only
+#   -6/--ipv6        Resolve names to IPv6 addresses only
 #   --definitions    List all built-in definitions
 #
 
@@ -284,19 +286,31 @@ http() {
 }
 
 http_head_curl() {
-  curl -qsILf "$1" >&4 2>&1
+  options=""
+  [ -n "${IPV4}" ] && options="--ipv4"
+  [ -n "${IPV6}" ] && options="--ipv6"
+  curl -qsILf ${options} "$1" >&4 2>&1
 }
 
 http_get_curl() {
-  curl -q -o "${2:--}" -sSLf "$1"
+  options=""
+  [ -n "${IPV4}" ] && options="--ipv4"
+  [ -n "${IPV6}" ] && options="--ipv6"
+  curl -q -o "${2:--}" -sSLf ${options} "$1"
 }
 
 http_head_wget() {
-  wget -q --spider "$1" >&4 2>&1
+  options=""
+  [ -n "${IPV4}" ] && options="--inet4-only"
+  [ -n "${IPV6}" ] && options="--inet6-only"
+  wget -q --spider ${options} "$1" >&4 2>&1
 }
 
 http_get_wget() {
-  wget -nv -O "${2:--}" "$1"
+  options=""
+  [ -n "${IPV4}" ] && options="--inet4-only"
+  [ -n "${IPV6}" ] && options="--inet6-only"
+  wget -nv ${options} -O "${2:--}" "$1"
 }
 
 fetch_tarball() {
@@ -1004,6 +1018,8 @@ sort_versions() {
 unset VERBOSE
 unset KEEP_BUILD_PATH
 unset HAS_PATCH
+unset IPV4
+unset IPV6
 
 RUBY_BUILD_INSTALL_PREFIX="$(abs_dirname "$0")/.."
 
@@ -1033,6 +1049,12 @@ for option in "${OPTIONS[@]}"; do
   "p" | "patch" )
     HAS_PATCH=true
     ;;
+  "4" | "ipv4")
+    IPV4=true
+    ;;
+  "6" | "ipv6")
+    IPV6=true
+    ;;
   "version" )
     version
     exit 0