diff --git a/build.config.aarch64 b/build.config.aarch64
index 0346722447a5..2bf2c158fcdb 100644
--- a/build.config.aarch64
+++ b/build.config.aarch64
@@ -1,10 +1,4 @@
 ARCH=arm64
-
-LLVM_IAS=1
-CROSS_COMPILE=aarch64-linux-gnu-
-CROSS_COMPILE_COMPAT=arm-linux-gnueabi-
-LINUX_GCC_CROSS_COMPILE_PREBUILTS_BIN=prebuilts/gas/linux-x86
-
 MAKE_GOALS="
 Image
 modules
diff --git a/build.config.arm b/build.config.arm
index d944676a87e0..832c3c07173a 100644
--- a/build.config.arm
+++ b/build.config.arm
@@ -1,9 +1,4 @@
 ARCH=arm
-
-LLVM_IAS=1
-CROSS_COMPILE=arm-linux-gnueabi-
-LINUX_GCC_CROSS_COMPILE_PREBUILTS_BIN=prebuilts/gas/linux-x86
-
 MAKE_GOALS="
 zImage
 modules
diff --git a/build.config.x86_64 b/build.config.x86_64
index ad246c9ff89e..8b0633e68538 100644
--- a/build.config.x86_64
+++ b/build.config.x86_64
@@ -1,9 +1,4 @@
 ARCH=x86_64
-
-LLVM_IAS=1
-CROSS_COMPILE=x86_64-linux-gnu-
-LINUX_GCC_CROSS_COMPILE_PREBUILTS_BIN=prebuilts/gas/linux-x86
-
 MAKE_GOALS="
 bzImage
 modules