diff --git a/libretro/Makefile b/libretro/Makefile
index 00b28cd..366ec17 100644
--- a/libretro/Makefile
+++ b/libretro/Makefile
@@ -109,8 +109,8 @@ else ifeq ($(platform), libnx)
 # Nintendo WiiU
 else ifeq ($(platform), wiiu)
    TARGET := $(TARGET_NAME)_libretro_$(platform).a
-   CC = $(DEVKITPPC)/bin/powerpc-eabi-gcc$(EXE_EXT)
-   AR = $(DEVKITPPC)/bin/powerpc-eabi-ar$(EXE_EXT)
+   CC ?= $(DEVKITPPC)/bin/powerpc-eabi-gcc$(EXE_EXT)
+   AR ?= $(DEVKITPPC)/bin/powerpc-eabi-ar$(EXE_EXT)
    CFLAGS += -DGEKKO -DHW_RVL -DWIIU -mwup -mcpu=750 -meabi -mhard-float -D__ppc__ -DMSB_FIRST -I$(DEVKITPRO)/libogc/include
    CFLAGS += -U__INT32_TYPE__ -U __UINT32_TYPE__ -D__INT32_TYPE__=int
    STATIC_LINKING = 1
@@ -149,7 +149,7 @@ else ifeq ($(platform), emscripten)
    fpic := -fPIC
    SHARED := -shared -Wl,--version-script=$(CORE_DIR)/libretro/link.T -Wl,--no-undefined
 else ifeq ($(platform), vita)
-   TARGET := $(TARGET_NAME)_vita.a
+   TARGET := $(TARGET_NAME)_libretro_vita.a
    CC = arm-vita-eabi-gcc
    AR = arm-vita-eabi-ar
    CFLAGS += -Wl,-q -O3 -fno-short-enums -fno-optimize-sibling-calls
@@ -181,14 +181,14 @@ else ifneq (,$(findstring windows_msvc2017,$(platform)))
 
 	TargetArchMoniker = $(subst $(WinPartition)_,,$(PlatformSuffix))
 
-	CC  = cl.exe
-	CXX = cl.exe
-	LD = link.exe
+	CC  ?= cl.exe
+	CXX ?= cl.exe
+	LD  ?= link.exe
 
 	reg_query = $(call filter_out2,$(subst $2,,$(shell reg query "$2" -v "$1" 2>nul)))
 	fix_path = $(subst $(SPACE),\ ,$(subst \,/,$1))
 
-	ProgramFiles86w := $(shell cmd /c "echo %PROGRAMFILES(x86)%")
+	ProgramFiles86w := $(shell cmd //c "echo %PROGRAMFILES(x86)%")
 	ProgramFiles86 := $(shell cygpath "$(ProgramFiles86w)")
 
 	WindowsSdkDir ?= $(call reg_query,InstallationFolder,HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Microsoft SDKs\Windows\v10.0)
@@ -251,7 +251,7 @@ else ifneq (,$(findstring windows_msvc2017,$(platform)))
 	LDFLAGS += -DLL
 
 else
-   CC = gcc
+   CC ?= gcc
    TARGET := $(TARGET_NAME)_libretro.dll
    SHARED := -shared -static-libgcc -static-libstdc++ -s -Wl,--version-script=$(CORE_DIR)/libretro/link.T -Wl,--no-undefined
 endif