PNBLACKLIST: use weak assignments

* this makes it easier to unblacklist it from local.conf which
  is parsed before the recipes

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

3 files changed, 2 insertions, 3 deletions

diff --git a/meta-oe/recipes-extended/acpica/acpitests_20140828.bb b/meta-oe/recipes-extended/acpica/acpitests_20140828.bb
index 93c20af5e..da2658218 100644
--- a/meta-oe/recipes-extended/acpica/acpitests_20140828.bb
+++ b/meta-oe/recipes-extended/acpica/acpitests_20140828.bb
@@ -6,7 +6,6 @@ LIC_FILES_CHKSUM = "file://tests/aapits/atexec.c;beginline=1;endline=115;md5=e92
 
 DEPENDS = "bison flex"
 
-
 SRC_URI = "https://acpica.org/sites/acpica/files/acpitests-unix-${PV}.tar.gz;name=acpitests \
            https://acpica.org/sites/acpica/files/acpica-unix2-${PV}.tar.gz;name=acpica \
            file://aapits-linux.patch \
diff --git a/meta-oe/recipes-extended/subsurface/subsurface_git.bb b/meta-oe/recipes-extended/subsurface/subsurface_git.bb
index 1edb19e35..22b9d2fd7 100644
--- a/meta-oe/recipes-extended/subsurface/subsurface_git.bb
+++ b/meta-oe/recipes-extended/subsurface/subsurface_git.bb
@@ -4,7 +4,7 @@ LIC_FILES_CHKSUM = "file://gpl-2.0.txt;md5=b234ee4d69f5fce4486a80fdaf4a4263"
 
 DEPENDS = "libdivecomputer gtk+ libxml2 glib-2.0 gconf"
 
-PNBLACKLIST[subsurface] = "Needs to be upgraded for compatibility with new libdivecomputer"
+PNBLACKLIST[subsurface] ?= "Needs to be upgraded for compatibility with new libdivecomputer"
 
 inherit gtk-icon-cache cmake
 
diff --git a/meta-oe/recipes-extended/zsh/zsh.inc b/meta-oe/recipes-extended/zsh/zsh.inc
index 86a546e6e..6dc40bf50 100644
--- a/meta-oe/recipes-extended/zsh/zsh.inc
+++ b/meta-oe/recipes-extended/zsh/zsh.inc
@@ -8,7 +8,7 @@ SECTION = "base/shell"
 LICENSE = "zsh"
 LIC_FILES_CHKSUM = "file://LICENCE;md5=b7bc853894664be455a922db9805288e"
 
-PNBLACKLIST[zsh] = "BROKEN: doesn't build with B!=S (gnu-configize executed in ${B})"
+PNBLACKLIST[zsh] ?= "BROKEN: doesn't build with B!=S (gnu-configize executed in ${B})"
 
 DEPENDS = "ncurses bison-native"