3ds: allow compiling with just DEVKITPRO set

diff --git a/Makefile.libretro b/Makefile.libretro
index 6bacb3f..21cbd28 100644 (file)
--- a/Makefile.libretro
+++ b/Makefile.libretro
@@ -66,6 +66,10 @@ else ifeq ($(platform), vita)
   LD = arm-vita-eabi-ld$(EXE_EXT)
   OBJCOPY = arm-vita-eabi-objcopy$(EXE_EXT)
 else ifeq ($(platform), ctr)
+  ifneq ($(strip $(DEVKITPRO)),)
+  DEVKITARM ?= $(DEVKITPRO)/devkitARM
+  CTRULIB ?= $(DEVKITPRO)/libctru
+  endif
   ifeq ($(strip $(DEVKITARM)),)
   $(error "DEVKITARM env var is not set")
   endif