diff --git a/examples/lm3s/Makefile.include b/examples/lm3s/Makefile.include
index 4d774bea..0e18bd62 100644
--- a/examples/lm3s/Makefile.include
+++ b/examples/lm3s/Makefile.include
@@ -24,7 +24,7 @@ CC		= $(PREFIX)-gcc
 LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
-ifeq ($(shell ls ../../../../../lib/libopencm3_lm3s.a 2>/dev/null),)
+ifeq ($(wildcard ../../../../lib/libopencm3_lm3s.a),)
 TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
 else
 ifeq ($(V),1)
diff --git a/examples/lpc13xx/Makefile.include b/examples/lpc13xx/Makefile.include
index afd0524c..cc668f89 100644
--- a/examples/lpc13xx/Makefile.include
+++ b/examples/lpc13xx/Makefile.include
@@ -24,7 +24,7 @@ CC		= $(PREFIX)-gcc
 LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
-ifeq ($(shell ls ../../../../../lib/libopencm3_lpc13xx.a 2>/dev/null),)
+ifeq ($(wildcard ../../../../lib/libopencm3_lpc13xx.a),)
 TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
 else
 ifeq ($(V),1)
diff --git a/examples/lpc17xx/Makefile.include b/examples/lpc17xx/Makefile.include
index f620a72f..66688d32 100644
--- a/examples/lpc17xx/Makefile.include
+++ b/examples/lpc17xx/Makefile.include
@@ -24,7 +24,7 @@ CC		= $(PREFIX)-gcc
 LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
-ifeq ($(shell ls ../../../../../lib/libopencm3_lpc17xx.a 2>/dev/null),)
+ifeq ($(wildcard ../../../../lib/libopencm3_lpc17xx.a),)
 TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
 else
 ifeq ($(V),1)
diff --git a/examples/lpc43xx/Makefile.include b/examples/lpc43xx/Makefile.include
index b4717cdd..4b1a092f 100644
--- a/examples/lpc43xx/Makefile.include
+++ b/examples/lpc43xx/Makefile.include
@@ -27,7 +27,7 @@ LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
 GDB		= $(PREFIX)-gdb
-ifeq ($(shell ls ../../../../../lib/libopencm3_lpc43xx.a 2>/dev/null),)
+ifeq ($(wildcard ../../../../lib/libopencm3_lpc43xx.a),)
 TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
 else
 ifeq ($(V),1)
diff --git a/examples/stm32/f1/Makefile.include b/examples/stm32/f1/Makefile.include
index 66865b85..b315fac1 100644
--- a/examples/stm32/f1/Makefile.include
+++ b/examples/stm32/f1/Makefile.include
@@ -25,7 +25,7 @@ LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
 GDB		= $(PREFIX)-gdb
-ifeq ($(shell ls ../../../../../lib/libopencm3_stm32f1.a 2>/dev/null),)
+ifeq ($(wildcard ../../../../../lib/libopencm3_stm32f1.a),)
 TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
 else
 ifeq ($(V),1)
diff --git a/examples/stm32/f2/Makefile.include b/examples/stm32/f2/Makefile.include
index 93f6ce6d..33130bee 100644
--- a/examples/stm32/f2/Makefile.include
+++ b/examples/stm32/f2/Makefile.include
@@ -26,7 +26,7 @@ LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
 GDB		= $(PREFIX)-gdb
-ifeq ($(shell ls ../../../../../lib/libopencm3_stm32f2.a 2>/dev/null),)
+ifeq ($(wildcard ../../../../../lib/libopencm3_stm32f2.a),)
 TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
 else
 ifeq ($(V),1)
diff --git a/examples/stm32/f4/Makefile.include b/examples/stm32/f4/Makefile.include
index 2e915ce7..31ede743 100644
--- a/examples/stm32/f4/Makefile.include
+++ b/examples/stm32/f4/Makefile.include
@@ -26,7 +26,7 @@ LD		= $(PREFIX)-gcc
 OBJCOPY		= $(PREFIX)-objcopy
 OBJDUMP		= $(PREFIX)-objdump
 GDB		= $(PREFIX)-gdb
-ifeq ($(shell ls ../../../../../lib/libopencm3_stm32f4.a 2>/dev/null),)
+ifeq ($(wildcard ../../../../../lib/libopencm3_stm32f4.a),)
 TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
 else
 ifeq ($(V),1)