diff --git a/Makefile.system b/Makefile.system
index f574edf88..eb57cbb30 100644
--- a/Makefile.system
+++ b/Makefile.system
@@ -9,6 +9,11 @@ ifndef TOPDIR
 TOPDIR = .
 endif
 
+# If ARCH is not set, we use the host system's architecture.
+ifndef ARCH
+ARCH := $(shell uname -m)
+endif
+
 # Catch conflicting usage of ARCH in some BSD environments
 ifeq ($(ARCH), amd64)
 override ARCH=x86_64
@@ -137,6 +142,10 @@ endif
 endif
 
 
+# On x86_64 build getarch with march=native. This is required to detect AVX512 support in getarch.
+ifeq ($(ARCH), x86_64)
+GETARCH_FLAGS += -march=native
+endif
 
 
 ifdef INTERFACE64
diff --git a/c_check b/c_check
index d93b756d5..271182c54 100644
--- a/c_check
+++ b/c_check
@@ -240,7 +240,7 @@ if (($architecture eq "x86") || ($architecture eq "x86_64")) {
 	} else {
 	    $no_avx512 = 0;
 	}
-	unlink("tmpf.o");
+	unlink("$tmpf.o");
     }
 }
 
diff --git a/cmake/system.cmake b/cmake/system.cmake
index adedd32cc..7f3696286 100644
--- a/cmake/system.cmake
+++ b/cmake/system.cmake
@@ -65,6 +65,11 @@ if (DEFINED TARGET)
   set(GETARCH_FLAGS "-DFORCE_${TARGET}")
 endif ()
 
+# On x86_64 build getarch with march=native. This is required to detect AVX512 support in getarch.
+if (X86_64)
+  set(GETARCH_FLAGS "${GETARCH_FLAGS} -march=native")
+endif ()
+
 if (INTERFACE64)
   message(STATUS "Using 64-bit integers.")
   set(GETARCH_FLAGS	"${GETARCH_FLAGS} -DUSE64BITINT")