diff --git a/Makefile b/Makefile
index b213fcd..ea88021 100644
--- a/Makefile
+++ b/Makefile
@@ -95,9 +95,9 @@ CFLAGS += -std=c99
 CFLAGS += -Wpedantic -Wall -Werror -Wundef -Wextra -Wshadow -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes -Wstrict-overflow=5
 # add options for better code optimization
 CFLAGS += -fno-common -ffunction-sections -fdata-sections
-# use variable size enum (opencm3 and libc do)
+# use variable size enum (opencm3, gcc, and compiler-rt do)
 CFLAGS += -fshort-enums
-# use no variable size enum
+# use no variable size enum (musl does not)
 #CFLAGS += -fno-short-enums
 # don't use system main definition (the starting point)
 CFLAGS += -ffreestanding
@@ -121,22 +121,28 @@ CFLAGS += $(DEFS)
 LDFLAGS += -static
 # don's include the system start files
 LDFLAGS += -nostartfiles
-# don't use system libraries
-#LDFLAGS += -nostdlib -nostdinc
 # only keep used sections
 LDFLAGS += --gc-sections
+# don't use system libraries
+#LDFLAGS += -nostdlib -nostdinc
+# add musl libraries (for libc, libm)
+#LDFLAGS += --library-path /media/data/tmp/arm-linux-musleabi/arm-linux-musleabi/lib
+# add system libraries (for libc, libm, libnosys)
+LDFLAGS += --library-path /usr/arm-none-eabi/lib/armv7-m/
+# add gcc library (for ARM ABI to be used by gcc)
+LDFLAGS += --library-path /usr/lib/gcc/arm-none-eabi/*/armv7-m/
+# add compiler-rt library (for ARM ABI to be used by clang)
+#LDFLAGS += --library-path /usr/arm-none-eabi/lib/armv7-m/
 # opencm3 libraries
 LDFLAGS += --library-path $(OPENCM3_LIB)
-# add c,m,nosys system libraries
-LDFLAGS += --library-path /usr/arm-none-eabi/lib/armv7-m/
-# add gcc system library
-LDFLAGS += --library-path /usr/lib/gcc/arm-none-eabi/*/armv7-m/
+
 # linker script with definitions for micro-controller
 LDFLAGS += --script $(LDSCRIPT)
 
-# used libraries (must be provided after objects)
+# used libraries when using gcc (must be provided after objects)
 LDLIBS += --library $(STM32F1_LIB) --library c --library gcc --library nosys --library m
-
+# used libraries when using clang (must be provided after objects)
+#LDLIBS += --library $(STM32F1_LIB) --library c --library m --library clang_rt.builtins
 
 # target micro-controller information (ARM Cortex-M3 supports thumb and thumnb2, but does not include a floating point unit)
 ARCH_FLAGS = -mthumb -mcpu=cortex-m3 -msoft-float