diff --git a/boards/arm/stm32/stm32f4discovery/configs/cxxtest/defconfig b/boards/arm/stm32/stm32f4discovery/configs/cxxtest/defconfig
index 3f574c4418..9784e9650a 100644
--- a/boards/arm/stm32/stm32f4discovery/configs/cxxtest/defconfig
+++ b/boards/arm/stm32/stm32f4discovery/configs/cxxtest/defconfig
@@ -6,6 +6,7 @@
 # modifications.
 #
 # CONFIG_ARCH_FPU is not set
+CONFIG_ALLOW_GPL_COMPONENTS=y
 CONFIG_ARCH="arm"
 CONFIG_ARCH_BOARD="stm32f4discovery"
 CONFIG_ARCH_BOARD_STM32F4_DISCOVERY=y
diff --git a/boards/sim/sim/sim/configs/cxxtest/defconfig b/boards/sim/sim/sim/configs/cxxtest/defconfig
index 3ddc6cfe57..bb343f7578 100644
--- a/boards/sim/sim/sim/configs/cxxtest/defconfig
+++ b/boards/sim/sim/sim/configs/cxxtest/defconfig
@@ -5,6 +5,7 @@
 # You can then do "make savedefconfig" to generate a new defconfig file that includes your
 # modifications.
 #
+CONFIG_ALLOW_GPL_COMPONENTS=y
 CONFIG_ARCH="sim"
 CONFIG_ARCH_BOARD="sim"
 CONFIG_ARCH_BOARD_SIM=y
diff --git a/libs/libxx/Kconfig b/libs/libxx/Kconfig
index 988554da75..35017bcffb 100644
--- a/libs/libxx/Kconfig
+++ b/libs/libxx/Kconfig
@@ -53,6 +53,7 @@ config LIBCXX
 config UCLIBCXX
 	bool "uClibc++ Standard C++ Library"
 	select HAVE_CXXINITIALIZE
+	depends on ALLOW_GPL_COMPONENTS
 	---help---
 		uClibc++ C++ library
 		https://cxx.uclibc.org/