diff --git a/make/target/toolchain/gcc/arch/arc/defs.exec b/make/target/toolchain/gcc/arch/arc/defs.exec
index 85c4bc48387..4b8d9861912 100644
--- a/make/target/toolchain/gcc/arch/arc/defs.exec
+++ b/make/target/toolchain/gcc/arch/arc/defs.exec
@@ -39,4 +39,4 @@ OC_ARCH ?= arc
 OC_TARGET ?= elf32-${OC_ARCH}
 
 # path to the compiler auxiliary libraries
-iTC_AUX_LIB_DIR = $(wildcard $(iGCC_DIR)/lib/gcc/$(iGCC_TARGET)/$(vGCC_VER).*/em)
+iTC_AUX_LIB_DIR ?= $(wildcard $(iGCC_DIR)/lib/gcc/$(iGCC_TARGET)/$(vGCC_VER).*/em)
diff --git a/make/target/toolchain/gcc/arch/arm/defs.exec b/make/target/toolchain/gcc/arch/arm/defs.exec
index 52bbef83100..899dbb96d3d 100644
--- a/make/target/toolchain/gcc/arch/arm/defs.exec
+++ b/make/target/toolchain/gcc/arch/arm/defs.exec
@@ -45,4 +45,4 @@ iGCC_LIB_ISA = $(strip \
 )
 
 # path to the compiler auxiliary libraries
-iTC_AUX_LIB_DIR = $(wildcard $(iGCC_DIR)/lib/gcc/$(iGCC_TARGET)/$(vGCC_VER).*)/${iGCC_LIB_ISA}
+iTC_AUX_LIB_DIR ?= $(wildcard $(iGCC_DIR)/lib/gcc/$(iGCC_TARGET)/$(vGCC_VER).*)/${iGCC_LIB_ISA}
diff --git a/make/target/toolchain/gcc/arch/x86/defs.exec b/make/target/toolchain/gcc/arch/x86/defs.exec
index 45cf99e0ef1..1abf9a73828 100644
--- a/make/target/toolchain/gcc/arch/x86/defs.exec
+++ b/make/target/toolchain/gcc/arch/x86/defs.exec
@@ -37,4 +37,4 @@ OC_ARCH ?= i386
 OC_TARGET ?= elf32-${OC_ARCH}
 
 # path to the compiler auxiliary libraries
-iTC_AUX_LIB_DIR = $(wildcard $(iGCC_DIR)/lib/gcc/$(iGCC_TARGET)/$(vGCC_VER).*)
+iTC_AUX_LIB_DIR ?= $(wildcard $(iGCC_DIR)/lib/gcc/$(iGCC_TARGET)/$(vGCC_VER).*)