commit 507eddf597305bac7c8b5db3ad1d89a2f2a019cf
Author: Matthew Ogilvie <mmogilvi_gnto@miniinfo.net>
Date:   Sun Dec 28 18:33:52 2014 -0700

    add --header="X-unique-cache-name: $FILE" to default FETCHCOMMAND
    
    If a cache like http-replicator recognizes this header, then it
    can use the ebuild-specified unique name instead of the filename
    part of URL to cache the file, which works better if the URL
    is not unique (changes over time, or is only unique in the
    directory portion).  For example, helps with caching
    adobe-flash packages.
    
    See gentoo bug # 442874

diff --git a/cnf/make.globals b/cnf/make.globals
index 013c556..716be90 100644
--- a/cnf/make.globals
+++ b/cnf/make.globals
@@ -36,8 +36,8 @@ RPMDIR="/usr/portage/rpm"
 PORTAGE_TMPDIR="/var/tmp"
 
 # Fetching command (3 tries, passive ftp for firewall compatibility)
-FETCHCOMMAND="wget -t 3 -T 60 --passive-ftp -O \"\${DISTDIR}/\${FILE}\" \"\${URI}\""
-RESUMECOMMAND="wget -c -t 3 -T 60 --passive-ftp -O \"\${DISTDIR}/\${FILE}\" \"\${URI}\""
+FETCHCOMMAND="wget -t 3 -T 60 --passive-ftp -O \"\${DISTDIR}/\${FILE}\" --header=\"X-unique-cache-name: \${FILE}\" \"\${URI}\""
+RESUMECOMMAND="wget -c -t 3 -T 60 --passive-ftp -O \"\${DISTDIR}/\${FILE}\" --header=\"X-unique-cache-name: \${FILE}\" \"\${URI}\""
 
 FETCHCOMMAND_RSYNC="rsync -avP \"\${URI}\" \"\${DISTDIR}/\${FILE}\""
 RESUMECOMMAND_RSYNC="rsync -avP \"\${URI}\" \"\${DISTDIR}/\${FILE}\""