diff --git a/poky/meta/lib/oe/recipeutils.py b/poky/meta/lib/oe/recipeutils.py
index 407d168..a0c6974 100644
--- a/poky/meta/lib/oe/recipeutils.py
+++ b/poky/meta/lib/oe/recipeutils.py
@@ -47,7 +47,7 @@
                 continue
             has_set = True
         elif event['op'] in ('append', 'prepend', 'postdot', 'predot'):
-            # Reminder: "append" and "prepend" mean += and =+ respectively, NOT _append / _prepend
+            # Reminder: "append" and "prepend" mean += and =+ respectively, NOT :append / :prepend
             if has_set:
                 continue
         ret_history.insert(0, event)
@@ -342,7 +342,7 @@
     def override_applicable(hevent):
         op = hevent['op']
         if '[' in op:
-            opoverrides = op.split('[')[1].split(']')[0].split('_')
+            opoverrides = op.split('[')[1].split(']')[0].split(':')
             for opoverride in opoverrides:
                 if not opoverride in overrides:
                     return False
@@ -368,13 +368,13 @@
                                 recipe_set = True
                     if not recipe_set:
                         for event in history:
-                            if event['op'].startswith('_remove'):
+                            if event['op'].startswith(':remove'):
                                 continue
                             if not override_applicable(event):
                                 continue
                             newvalue = value.replace(event['detail'], '')
-                            if newvalue == value and os.path.abspath(event['file']) == fn and event['op'].startswith('_'):
-                                op = event['op'].replace('[', '_').replace(']', '')
+                            if newvalue == value and os.path.abspath(event['file']) == fn and event['op'].startswith(':'):
+                                op = event['op'].replace('[', ':').replace(']', '')
                                 extravals[var + op] = None
                             value = newvalue
                             vals[var] = ('+=', value)
@@ -414,7 +414,7 @@
 
     fetch_urls(d)
     if all_variants:
-        # Get files for other variants e.g. in the case of a SRC_URI_append
+        # Get files for other variants e.g. in the case of a SRC_URI:append
         localdata = bb.data.createCopy(d)
         variants = (localdata.getVar('BBCLASSEXTEND') or '').split()
         if variants:
@@ -753,12 +753,12 @@
 
     destsubdir = rd.getVar('PN')
     if srcfiles:
-        bbappendlines.append(('FILESEXTRAPATHS_prepend', ':=', '${THISDIR}/${PN}:'))
+        bbappendlines.append(('FILESEXTRAPATHS:prepend', ':=', '${THISDIR}/${PN}:'))
 
     appendoverride = ''
     if machine:
         bbappendlines.append(('PACKAGE_ARCH', '=', '${MACHINE_ARCH}'))
-        appendoverride = '_%s' % machine
+        appendoverride = ':%s' % machine
     copyfiles = {}
     if srcfiles:
         instfunclines = []
@@ -772,7 +772,7 @@
                 # FIXME do we care if the entry is added by another bbappend that might go away?
                 if not srcurientry in rd.getVar('SRC_URI').split():
                     if machine:
-                        appendline('SRC_URI_append%s' % appendoverride, '=', ' ' + srcurientry)
+                        appendline('SRC_URI:append%s' % appendoverride, '=', ' ' + srcurientry)
                     else:
                         appendline('SRC_URI', '+=', srcurientry)
             copyfiles[newfile] = srcfile
@@ -786,7 +786,7 @@
                         instfunclines.append(instdirline)
                     instfunclines.append('install -m %s ${WORKDIR}/%s ${D}%s' % (perms, os.path.basename(srcfile), instdestpath))
         if instfunclines:
-            bbappendlines.append(('do_install_append%s()' % appendoverride, '', instfunclines))
+            bbappendlines.append(('do_install:append%s()' % appendoverride, '', instfunclines))
 
     if redirect_output:
         bb.note('Writing append file %s (dry-run)' % appendpath)
@@ -804,15 +804,15 @@
         extvars = {'destsubdir': destsubdir}
 
         def appendfile_varfunc(varname, origvalue, op, newlines):
-            if varname == 'FILESEXTRAPATHS_prepend':
+            if varname == 'FILESEXTRAPATHS:prepend':
                 if origvalue.startswith('${THISDIR}/'):
-                    popline('FILESEXTRAPATHS_prepend')
+                    popline('FILESEXTRAPATHS:prepend')
                     extvars['destsubdir'] = rd.expand(origvalue.split('${THISDIR}/', 1)[1].rstrip(':'))
             elif varname == 'PACKAGE_ARCH':
                 if machine:
                     popline('PACKAGE_ARCH')
                     return (machine, None, 4, False)
-            elif varname.startswith('do_install_append'):
+            elif varname.startswith('do_install:append'):
                 func = popline(varname)
                 if func:
                     instfunclines = [line.strip() for line in origvalue.strip('\n').splitlines()]
@@ -824,7 +824,7 @@
                 splitval = split_var_value(origvalue, assignment=False)
                 changed = False
                 removevar = varname
-                if varname in ['SRC_URI', 'SRC_URI_append%s' % appendoverride]:
+                if varname in ['SRC_URI', 'SRC_URI:append%s' % appendoverride]:
                     removevar = 'SRC_URI'
                     line = popline(varname)
                     if line:
@@ -853,11 +853,11 @@
                     newvalue = splitval
                     if len(newvalue) == 1:
                         # Ensure it's written out as one line
-                        if '_append' in varname:
+                        if ':append' in varname:
                             newvalue = ' ' + newvalue[0]
                         else:
                             newvalue = newvalue[0]
-                    if not newvalue and (op in ['+=', '.='] or '_append' in varname):
+                    if not newvalue and (op in ['+=', '.='] or ':append' in varname):
                         # There's no point appending nothing
                         newvalue = None
                     if varname.endswith('()'):