diff --git a/CMakeLists.txt b/CMakeLists.txt
index 570500f50..adc1b2912 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -146,7 +146,14 @@ list(APPEND UTIL_SRC ${CMAKE_CURRENT_BINARY_DIR}/version.c)
 source_group("Generated sources" FILES ${CMAKE_CURRENT_BINARY_DIR}/version.c)
 
 # Advanced settings
-set(BUILD_LTO ON CACHE BOOL "Build with link-time optimization")
+if(NOT DEFINED 3DS)
+	# LTO appears to make 3DS binary slower
+	set(DEFAULT_LTO ON)
+else()
+	set(DEFAULT_LTO OFF)
+endif()
+
+set(BUILD_LTO ${DEFAULT_LTO} CACHE BOOL "Build with link-time optimization")
 set(BUILD_PGO OFF CACHE BOOL "Build with profiling-guided optimization")
 set(PGO_STAGE_2 CACHE BOOL "Rebuild for profiling-guided optimization after profiles have been generated")
 set(PGO_DIR "/tmp/gba-pgo/" CACHE PATH "Profiling-guided optimization profiles path")
@@ -235,6 +242,10 @@ if(WII)
 	add_definitions(-U__STRICT_ANSI__)
 endif()
 
+if(DEFINED 3DS)
+	add_definitions(-D_GNU_SOURCE)
+endif()
+
 include(CheckFunctionExists)
 check_function_exists(strdup HAVE_STRDUP)
 check_function_exists(strndup HAVE_STRNDUP)
@@ -252,6 +263,13 @@ if(NOT CMAKE_SYSTEM_NAME STREQUAL "Generic")
 	check_function_exists(uselocale HAVE_USELOCALE)
 	check_function_exists(setlocale HAVE_SETLOCALE)
 else()
+	if(DEFINED 3DS)
+		check_function_exists(snprintf_l HAVE_SNPRINTF_L)
+		check_function_exists(newlocale HAVE_NEWLOCALE)
+		check_function_exists(freelocale HAVE_FREELOCALE)
+		check_function_exists(uselocale HAVE_USELOCALE)
+		check_function_exists(setlocale HAVE_SETLOCALE)
+	endif()
 	if(NOT DEFINED 3DS AND NOT DEFINED PSP2 AND NOT DEFINED WII)
 		set(DISABLE_DEPS ON CACHE BOOL "This platform cannot build with dependencies" FORCE)
 	endif()
@@ -276,7 +294,7 @@ if(HAVE_LOCALTIME_R)
 	list(APPEND FUNCTION_DEFINES HAVE_LOCALTIME_R)
 endif()
 
-if(HAVE_NEWLOCALE AND HAVE_FREELOCALE AND HAVE_USELOCALE OR APPLE)
+if(HAVE_NEWLOCALE AND HAVE_FREELOCALE AND HAVE_USELOCALE OR APPLE OR 3DS)
 	list(APPEND FUNCTION_DEFINES HAVE_LOCALE)
 	if (HAVE_STRTOF_L)
 		list(APPEND FUNCTION_DEFINES HAVE_STRTOF_L)