ltrace: add PV and PACKAGECONFIG for libunwind

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-devtools/ltrace/ltrace_git.bb

@@ -9,6 +9,8 @@ HOMEPAGE = "http://ltrace.org/"
 LICENSE = "GPLv2"
 LIC_FILES_CHKSUM = "file://COPYING;md5=eb723b61539feef013de476e68b5c50a"
 
+PE = "1"
+PV = "7.2+git${SRCPV}"
 SRCREV = "f44b28421979cec88d6d6a778fc27a8cd514f508"
 
 DEPENDS = "elfutils"
@@ -20,6 +22,8 @@ S = "${WORKDIR}/git"
 
 inherit autotools
 
+PACKAGECONFIG[unwind] = "--with-libunwind,--without-libunwind,libunwind"
+
 do_configure_prepend () {
 	( cd ${S}; ./autogen.sh )
 }