support to build with flag CROSS_COMPILE

Signed-off-by: ningmingxiao <[email protected]>

Author: ningmingxiao

Makefile

@@ -547,7 +547,10 @@ ifeq ($(GOOS),darwin)
 to_uname_m = $(foreach arch,$(1),$(shell echo $(arch) | sed 's/amd64/x86_64/'))
 else ifeq ($(GOOS),linux)
 # CC is required for cross-compiling on Linux.
-CC = $(call to_uname_m,$(GOARCH))-linux-gnu-gcc
+CC = gcc
+ifneq ($(CROSS_COMPILE),)
+	CC = $(call to_uname_m,$(GOARCH))-linux-gnu-gcc
+endif
 else ifeq ($(GOOS),windows)
 # artifact in zip format also provided for Windows.
 ARTIFACT_FILE_EXTENSIONS += .zip

website/content/en/docs/installation/source.md

@@ -22,6 +22,11 @@ cd lima
 make
 sudo make install
 ```
+Build other platform:
+``` bash
+make CROSS_COMPILE=1
+sudo make install
+```
 
 > **Note:** `sudo make install` is required unless you have write permissions for `/usr/local`. Otherwise, installation may fail.