[root] ~ # cat /etc/portage/bashrc
#PATCHES
pre_src_configure() {
    src_autopatcher
}
src_autopatcher() {

PATCH_DIR="/var/lib/portage/hardpatches"
PATCH_OPTS="-g0 -E --no-backup-if-mismatch"
local count=0
if [ -d "${PATCH_DIR}/${CATEGORY}/${PN}" ]; then
     for PATCH in $(find "${PATCH_DIR}/${CATEGORY}/${PN}" "${PATCH_DIR}/${CATEGORY}/${PN}/${PV}/" -maxdepth 1 -type f -name "*.patch"|sort)
     do
     einfo "Patching ${PATCH/*\//} ..."
       while [[ ${count} -lt 5 ]]; do
         if (patch -p${count} ${PATCH_OPTS} --dry-run -f < "${PATCH}") >/dev/null; then
         patch -p${count} ${PATCH_OPTS} < "${PATCH}" >/dev/null
         break
         fi
         (( count++ ))
       done
   if [[ ${count} -ge 5 ]] ; then
   eerror "Failed Patch: ${PATCH/*\//} !"
   die "Failed Patch: ${PATCH/*\//} !"
   fi
     done
fi
}

#post_src_prepare() {
#    if type epatch_user &> /dev/null ; then
#        epatch_user
#    fi
#}

post_src_prepare() {
	#:
	epatch_user
}
[root] ~ # cat /etc/portage/env/
dev-java/     net-im/       userpatch.sh  www-client/
[root] ~ # cat /etc/portage/env/userpatch.sh
if [ "${EBUILD_PHASE}" == "prepare" ]; then
        cd work/*
        epatch_user
        cd -
fi