NPTL is only available for glibc with m68k

target/config/Config.in.cpu

@@ -134,9 +134,10 @@ config ADK_CPU_LOONGSON2F
 
 config ADK_CPU_M68K
 	bool
-	select ADK_TARGET_WITH_LT if ADK_LINUX_UCLINUX
+	select ADK_TARGET_WITH_LT if ADK_TARGET_LIB_UCLIBC
+	select ADK_TARGET_WITH_LT if ADK_TARGET_LIB_UCLIBC_NG
 	select ADK_TARGET_WITH_MMU if !ADK_LINUX_UCLINUX
-	select ADK_TARGET_WITH_NPTL
+	select ADK_TARGET_WITH_NPTL if ADK_TARGET_LIB_GLIBC
 
 config ADK_CPU_MIPS32
 	bool