initialize all_arch in constructors
diff --git a/config.mk b/config.mk
index 51a31a4..d5ff516 100644
--- a/config.mk
+++ b/config.mk
@@ -2,13 +2,13 @@
 CAPSTONE_ARCHS =
 
 # Comment the line below if you don't want to ARM support
-#CAPSTONE_ARCHS += arm
+CAPSTONE_ARCHS += arm
 
 # Comment the line below if you don't want to ARM64 support
-#CAPSTONE_ARCHS += aarch64
+CAPSTONE_ARCHS += aarch64
 
 # Comment the line below if you don't want to Mips support
-#CAPSTONE_ARCHS += mips
+CAPSTONE_ARCHS += mips
 
 # Comment the line below if you don't want to X86 support
 CAPSTONE_ARCHS += x86