support proxy
diff --git a/initramfs-build.sh b/initramfs-build.sh
index 65abf39..12dfcd6 100755
--- a/initramfs-build.sh
+++ b/initramfs-build.sh
@@ -63,6 +63,10 @@
 
 set -x
 
+export http_proxy=${http_proxy}
+export https_proxy=${http_proxy}
+export ftp_proxy=${http_proxy}
+
 cd ${WORKSPACE}
 
 # Go into the linux directory (the script will put us in a build subdir)