gnu_efi_kernel: Fix the build.

sys-boot/gnu-efi/gnu_efi_kernel-3.0.4.recipe

@@ -6,7 +6,7 @@ HOMEPAGE="https://sourceforge.net/projects/gnu-efi/"
 COPYRIGHT="1999-2007 Hewlett-Packard Co.
 	2006-2010 Intel Co."
 LICENSE="BSD (3-clause)"
-REVISION="1"
+REVISION="2"
 SOURCE_URI="http://downloads.sf.net/gnu-efi/gnu-efi-$portVersion.tar.bz2"
 CHECKSUM_SHA256="51a00428c3ccb96db24089ed8394843c4f83cf8f42c6a4dfddb4b7c23f2bf8af"
 SOURCE_DIR="gnu-efi-$portVersion"
@@ -18,6 +18,10 @@ PROVIDES="
 	gnu_efi_kernel = $portVersion compat >= 0
 	"
 
+BUILD_REQUIRES="
+	cmd:rsync
+	"
+
 INSTALL()
 {
 	mkdir -p $includeDir/gnuefi