I ran into this problem as well.&nbsp; It doesn't seem like SRCPV is being set properly before use in the externalsrc.bbclass.&nbsp; I added the following line before bpn = d.getVar('BPN'), and now it works fine.&nbsp; Unfortunately, I needed to create another layer that overrides the poky classes to include it in my build.&nbsp; Here's the added line:<br /><br />
<div>&nbsp; &nbsp; srcpv = d.getVar('SRCPV')</div>
<div><br />And here's a bit of context:<br /><br />
<div>python () {</div>
<div>&nbsp; &nbsp; externalsrc = d.getVar('EXTERNALSRC')</div>
<div>&nbsp; &nbsp; externalsrcbuild = d.getVar('EXTERNALSRC_BUILD')</div>
<div>&nbsp;</div>
<div>&nbsp; &nbsp; if externalsrc and not externalsrc.startswith("/"):</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; bb.error("EXTERNALSRC must be an absolute path")</div>
<div>&nbsp; &nbsp; if externalsrcbuild and not externalsrcbuild.startswith("/"):</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; bb.error("EXTERNALSRC_BUILD must be an absolute path")</div>
<div>&nbsp;</div>
<div>&nbsp; &nbsp; srcpv = d.getVar('SRCPV')</div>
<div>&nbsp;</div>
<div>&nbsp; &nbsp; # If this is the base recipe and EXTERNALSRC is set for it or any of its</div>
<div>&nbsp; &nbsp; # derivatives, then enable BB_DONT_CACHE to force the recipe to always be</div>
<div>&nbsp; &nbsp; # re-parsed so that the file-checksums function for do_compile is run every</div>
<div>&nbsp; &nbsp; # time.</div>
<div>&nbsp; &nbsp; bpn = d.getVar('BPN')</div>
<div>&nbsp; &nbsp; classextend = (d.getVar('BBCLASSEXTEND') or '').split()</div>
<div>&nbsp; &nbsp; if bpn == d.getVar('PN') or not classextend:</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; if (externalsrc or</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ('native' in classextend and</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;d.getVar('EXTERNALSRC:pn-%s-native' % bpn)) or</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ('nativesdk' in classextend and</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;d.getVar('EXTERNALSRC:pn-nativesdk-%s' % bpn)) or</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ('cross' in classextend and</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;d.getVar('EXTERNALSRC:pn-%s-cross' % bpn))):</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; d.setVar('BB_DONT_CACHE', '1')</div>
<div>&nbsp;</div>
<div>&nbsp; &nbsp; if externalsrc:</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; import oe.recipeutils</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; import oe.path</div>
<div>&nbsp;</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; d.setVar('S', externalsrc)</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; if externalsrcbuild:</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; d.setVar('B', externalsrcbuild)</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; else:</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; d.setVar('B', '${WORKDIR}/${BPN}-${PV}')</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</div>
<div>&nbsp;</div>
</div>