diff --git a/libretro-buildbot-recipe.sh b/libretro-buildbot-recipe.sh
index c59f58c8..404f657f 100755
--- a/libretro-buildbot-recipe.sh
+++ b/libretro-buildbot-recipe.sh
@@ -1,3 +1,4 @@
+
 #!/bin/bash
 
 ####usage:
@@ -68,7 +69,12 @@ if [ -z "$RARCH_DIST_DIR" ]; then
     RARCH_DIST_DIR="$RARCH_DIR/$DIST_DIR"
 fi
 
-mkdir -p "$RARCH_DIST_DIR"
+if [ "${PURGE}" == "YES" ]; then
+   echo PURGE=$PURGE, cleaning up old cores
+   rm -rv "$RARCH_DIST_DIR"
+fi
+
+mkdir -v -p "$RARCH_DIST_DIR"
 
 if [ "${PLATFORM}" == "android" ];
 then
diff --git a/recipes/recipes.win-mingw32-dw2.conf b/recipes/recipes.win-mingw32-dw2.conf
index 72d145de..73f225c9 100644
--- a/recipes/recipes.win-mingw32-dw2.conf
+++ b/recipes/recipes.win-mingw32-dw2.conf
@@ -4,3 +4,5 @@ ARCH x86
 MAKE mingw32-make.exe
 CC gcc
 CXX g++
+CXX11 g++
+
diff --git a/recipes/recipes.win-mingw64-seh.conf b/recipes/recipes.win-mingw64-seh.conf
index 1cc70ffa..2ec99928 100644
--- a/recipes/recipes.win-mingw64-seh.conf
+++ b/recipes/recipes.win-mingw64-seh.conf
@@ -4,3 +4,4 @@ ARCH x86_64
 MAKE mingw32-make.exe
 CC gcc
 CXX g++
+CXX11 g++
diff --git a/recipes/recipes.win-mingw64-sjlj.conf b/recipes/recipes.win-mingw64-sjlj.conf
index 1d67c4a9..24bc5497 100644
--- a/recipes/recipes.win-mingw64-sjlj.conf
+++ b/recipes/recipes.win-mingw64-sjlj.conf
@@ -4,3 +4,4 @@ ARCH x86_64
 MAKE mingw32-make.exe
 CC gcc
 CXX g++
+