diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 11b991dc..29580123 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -21,7 +21,7 @@
 
 .miniforge:
   script:
-    - wget -O ~/Miniforge3.sh "https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-$(uname)-$(uname -m).sh"
+    - wget -O ~/Miniforge3.sh "https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-Linux-x86_64.sh"
     - bash ~/Miniforge3.sh -b -p ~/miniforge3
     - source ~/miniforge3/etc/profile.d/conda.sh
     - conda install -y ${MINIFORGE_PACKAGES}
diff --git a/Makefile.libretro b/Makefile.libretro
index db3767b8..84486266 100644
--- a/Makefile.libretro
+++ b/Makefile.libretro
@@ -37,9 +37,12 @@ else ifeq ($(platform),android-arm)
     MKXPZ_CPU_FAMILY = armv7
     MKXPZ_CPU = generic-armv7-a
     MKXPZ_ENDIAN = little
-    CC = $(ANDROID_NDK_CLANG)/bin/armv7a-linux-androideabi21-clang
-    CXX = $(ANDROID_NDK_CLANG)/bin/armv7a-linux-androideabi21-clang++
+    # 32-bit builds are broken with Android API versions older than 24; see https://github.com/android/ndk/issues/442
+    CC = $(ANDROID_NDK_CLANG)/bin/armv7a-linux-androideabi24-clang
+    CXX = $(ANDROID_NDK_CLANG)/bin/armv7a-linux-androideabi24-clang++
     AR = $(ANDROID_NDK_LLVM)/bin/llvm-ar
+    # The build times out with LTO enabled
+    MKXPZ_LTO = false
 else ifeq ($(platform),android-arm64)
     MKXPZ_SYSTEM = android
     MKXPZ_SUFFIX = android
@@ -50,6 +53,8 @@ else ifeq ($(platform),android-arm64)
     CC = $(ANDROID_NDK_CLANG)/bin/aarch64-linux-android21-clang
     CXX = $(ANDROID_NDK_CLANG)/bin/aarch64-linux-android21-clang++
     AR = $(ANDROID_NDK_LLVM)/bin/llvm-ar
+    # The build times out with LTO enabled
+    MKXPZ_LTO = false
 else ifeq ($(platform),android-x86)
     MKXPZ_SYSTEM = android
     MKXPZ_SUFFIX = android
@@ -57,9 +62,12 @@ else ifeq ($(platform),android-x86)
     MKXPZ_CPU_FAMILY = x86
     MKXPZ_CPU = i686
     MKXPZ_ENDIAN = little
-    CC = $(ANDROID_NDK_CLANG)/bin/i686-linux-android21-clang
-    CXX = $(ANDROID_NDK_CLANG)/bin/i686-linux-android21-clang++
+    # 32-bit builds are broken with Android API versions older than 24; see https://github.com/android/ndk/issues/442
+    CC = $(ANDROID_NDK_CLANG)/bin/i686-linux-android24-clang
+    CXX = $(ANDROID_NDK_CLANG)/bin/i686-linux-android24-clang++
     AR = $(ANDROID_NDK_LLVM)/bin/llvm-ar
+    # The build times out with LTO enabled
+    MKXPZ_LTO = false
 else ifeq ($(platform),android-x86_64)
     MKXPZ_SYSTEM = android
     MKXPZ_SUFFIX = android
@@ -70,24 +78,34 @@ else ifeq ($(platform),android-x86_64)
     CC = $(ANDROID_NDK_CLANG)/bin/x86_64-linux-android21-clang
     CXX = $(ANDROID_NDK_CLANG)/bin/x86_64-linux-android21-clang++
     AR = $(ANDROID_NDK_LLVM)/bin/llvm-ar
+    # The build times out with LTO enabled
+    MKXPZ_LTO = false
 else ifeq ($(platform),ios-arm64)
     MKXPZ_SYSTEM = darwin
     MKXPZ_SUFFIX = ios
     MKXPZ_CPU_FAMILY = aarch64
     MKXPZ_CPU = generic-armv8-a
     MKXPZ_ENDIAN = little
+    CC = ['xcrun', '--sdk', 'iphoneos', '$(CC)', '-arch', 'arm64']
+    CXX = ['xcrun', '--sdk', 'iphoneos', '$(CXX)', '-arch', 'arm64']
 else ifeq ($(platform),ios9)
     MKXPZ_SYSTEM = darwin
     MKXPZ_SUFFIX = ios
     MKXPZ_CPU_FAMILY = armv7
     MKXPZ_CPU = generic-armv7-a
     MKXPZ_ENDIAN = little
+    CC = ['xcrun', '--sdk', 'iphoneos', '$(CC)', '-arch', 'armv7']
+    CXX = ['xcrun', '--sdk', 'iphoneos', '$(CXX)', '-arch', 'armv7']
+    # The build times out with LTO enabled
+    MKXPZ_LTO = false
 else ifeq ($(platform),tvos-arm64)
     MKXPZ_SYSTEM = darwin
     MKXPZ_SUFFIX = tvos
     MKXPZ_CPU_FAMILY = aarch64
     MKXPZ_CPU = generic-armv8-a
     MKXPZ_ENDIAN = little
+    CC = ['xcrun', '--sdk', 'appletvos', '$(CC)', '-arch', 'arm64']
+    CXX = ['xcrun', '--sdk', 'appletvos', '$(CXX)', '-arch', 'arm64']
 else ifeq ($(platform),libnx)
     MKXPZ_SYSTEM = bare
     MKXPZ_SUFFIX = libnx
@@ -97,6 +115,8 @@ else ifeq ($(platform),libnx)
     CC = /opt/devkitpro/devkitA64/bin/aarch64-none-elf-gcc
     CXX = /opt/devkitpro/devkitA64/bin/aarch64-none-elf-g++
     AR = /opt/devkitpro/devkitA64/bin/aarch64-none-elf-ar
+    # The build times out with LTO enabled
+    MKXPZ_LTO = false
 else ifeq ($(platform),gcw0)
     MKXPZ_SYSTEM = linux
     MKXPZ_CPU_FAMILY = mips
@@ -118,6 +138,8 @@ else ifeq ($(platform),emscripten)
     MKXPZ_CPU_FAMILY = wasm32
     MKXPZ_CPU = wasm32
     MKXPZ_ENDIAN = little
+    # The build times out with LTO enabled
+    MKXPZ_LTO = false
 else
     $(error unknown platform '$(platform)')
 endif
@@ -165,13 +187,26 @@ $(MKXPZ_BUILD_DIR)/build.ini: $(MKXPZ_CROSS_FILE)
 
 $(MKXPZ_CROSS_FILE):
 	echo "[binaries]" > $(MKXPZ_CROSS_FILE)
+ifeq ($(patsubst [%,,$(firstword $(CC))),)
+	echo "c = $(CC)" >> $(MKXPZ_CROSS_FILE)
+else
 	echo "c = '$(CC)'" >> $(MKXPZ_CROSS_FILE)
+endif
+ifeq ($(patsubst [%,,$(firstword $(CXX))),)
+	echo "cpp = $(CXX)" >> $(MKXPZ_CROSS_FILE)
+else
 	echo "cpp = '$(CXX)'" >> $(MKXPZ_CROSS_FILE)
+endif
 	echo "ar = '$(AR)'" >> $(MKXPZ_CROSS_FILE)
 	echo "[host_machine]" >> $(MKXPZ_CROSS_FILE)
 	echo "system = '$(MKXPZ_SYSTEM)'" >> $(MKXPZ_CROSS_FILE)
 	echo "cpu_family = '$(MKXPZ_CPU_FAMILY)'" >> $(MKXPZ_CROSS_FILE)
 	echo "cpu = '$(MKXPZ_CPU)'" >> $(MKXPZ_CROSS_FILE)
 	echo "endian = '$(MKXPZ_ENDIAN)'" >> $(MKXPZ_CROSS_FILE)
-	if [ -n '$(MKXPZ_ARCH_CMAKE)' ]; then echo "[cmake]" >> $(MKXPZ_CROSS_FILE); fi
-	if [ -n '$(MKXPZ_ARCH_CMAKE)' ]; then echo "CMAKE_SYSTEM_PROCESSOR = '$(MKXPZ_ARCH_CMAKE)'" >> $(MKXPZ_CROSS_FILE); fi
+	echo "[cmake]" >> $(MKXPZ_CROSS_FILE); fi
+ifneq ($(MKXPZ_ARCH_CMAKE),)
+	echo "CMAKE_SYSTEM_PROCESSOR = '$(MKXPZ_ARCH_CMAKE)'" >> $(MKXPZ_CROSS_FILE)
+endif
+ifeq ($(MKXPZ_SYSTEM),darwin)
+	echo "CMAKE_OSX_SYSROOT = '/nonexistent'" >> $(MKXPZ_CROSS_FILE)
+endif