Allow cross compilation prefix to come from CROSS_COMPILE environment variable
diff --git a/Configure b/Configure
index 5cac797..8d48869 100755
--- a/Configure
+++ b/Configure
@@ -1047,6 +1047,8 @@
 $perl=$ENV{'PERL'} or $perl=&which("perl5") or $perl=&which("perl")
   or $perl="perl";
 
+$cross_compile_prefix=$ENV{'CROSS_COMPILE'};
+
 chop $openssldir if $openssldir =~ /\/$/;
 chop $prefix if $prefix =~ /.\/$/;