Fetch petitboot via HTTPS, not git (allow building behind a proxy)
diff --git a/openpower/package/petitboot/petitboot.mk b/openpower/package/petitboot/petitboot.mk
index eec280d..f2881b5 100644
--- a/openpower/package/petitboot/petitboot.mk
+++ b/openpower/package/petitboot/petitboot.mk
@@ -5,7 +5,7 @@
 ################################################################################
 
 PETITBOOT_VERSION = d171258160f7ed4756531f51e66fb116753bc990
-PETITBOOT_SITE = git://github.com/open-power/petitboot.git
+PETITBOOT_SITE ?= $(call github,open-power,petitboot,$(PETITBOOT_VERSION))
 PETITBOOT_DEPENDENCIES = ncurses udev host-bison host-flex lvm2
 PETITBOOT_LICENSE = GPLv2
 PETITBOOT_LICENSE_FILES = COPYING