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>

33 files changed, 32 insertions, 33 deletions

diff --git a/meta-filesystems/recipes-filesystems/ifuse/ifuse_1.1.2.bb b/meta-filesystems/recipes-filesystems/ifuse/ifuse_1.1.2.bb
index 9a26642bb1..42f4c872bd 100644
--- a/meta-filesystems/recipes-filesystems/ifuse/ifuse_1.1.2.bb
+++ b/meta-filesystems/recipes-filesystems/ifuse/ifuse_1.1.2.bb
@@ -3,7 +3,7 @@ LICENSE = "LGPLv2.1"
 LIC_FILES_CHKSUM = "file://COPYING;md5=6ab17b41640564434dda85c06b7124f7"
 HOMEPAGE ="http://www.libimobiledevice.org/"
 
-PNBLACKLIST[ifuse] = "depends on blacklisted libimobiledevice"
+PNBLACKLIST[ifuse] ?= "depends on blacklisted libimobiledevice"
 DEPENDS = "fuse libimobiledevice"
 
 SRC_URI = " \
diff --git a/meta-gnome/recipes-apps/gnome-mplayer/gnome-mplayer_1.0.5.bb b/meta-gnome/recipes-apps/gnome-mplayer/gnome-mplayer_1.0.5.bb
index c5ac6e23fb..ef460f13df 100644
--- a/meta-gnome/recipes-apps/gnome-mplayer/gnome-mplayer_1.0.5.bb
+++ b/meta-gnome/recipes-apps/gnome-mplayer/gnome-mplayer_1.0.5.bb
@@ -5,7 +5,7 @@ SECTION = "multimedia"
 LICENSE = "GPLv2+"
 LIC_FILES_CHKSUM = "file://COPYING;md5=59530bdf33659b29e73d4adb9f9f6552"
 
-PNBLACKLIST[gnome-mplayer] = "rdepends on blacklisted mplayer"
+PNBLACKLIST[gnome-mplayer] ?= "rdepends on blacklisted mplayer"
 PR = "r2"
 
 DEPENDS = "gmtk gtk+ alsa-lib libnotify glib-2.0 dbus-glib virtual/libx11 libxscrnsaver"
diff --git a/meta-gnome/recipes-gnome/gcr/gcr_3.8.2.bb b/meta-gnome/recipes-gnome/gcr/gcr_3.8.2.bb
index 1a70ac0cf2..e9a837bb95 100644
--- a/meta-gnome/recipes-gnome/gcr/gcr_3.8.2.bb
+++ b/meta-gnome/recipes-gnome/gcr/gcr_3.8.2.bb
@@ -7,7 +7,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=55ca817ccb7d5b5b66355690e9abc605"
 
 DEPENDS = "gtk+3 p11-kit glib-2.0 libgcrypt"
 
-PNBLACKLIST[gcr] = "CONFLICT: 4 files conflict with gnome-keyring"
+PNBLACKLIST[gcr] ?= "CONFLICT: 4 files conflict with gnome-keyring"
 # e.g. sysroots/qemux86-64/usr/share/glib-2.0/schemas/org.gnome.crypto.pgp.gschema.xml
 #      sysroots/qemux86-64/usr/share/GConf/gsettings/org.gnome.crypto.pgp.convert
 
diff --git a/meta-gnome/recipes-gnome/gnome-menus/gnome-menus3_3.10.1.bb b/meta-gnome/recipes-gnome/gnome-menus/gnome-menus3_3.10.1.bb
index 38ea5e51a3..611499affc 100644
--- a/meta-gnome/recipes-gnome/gnome-menus/gnome-menus3_3.10.1.bb
+++ b/meta-gnome/recipes-gnome/gnome-menus/gnome-menus3_3.10.1.bb
@@ -4,7 +4,7 @@ LICENSE = "GPLv2 & LGPLv2"
 LIC_FILES_CHKSUM = "file://COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263 \
                     file://COPYING.LIB;md5=5f30f0716dfdd0d91eb439ebec522ec2"
 
-PNBLACKLIST[gnome-menus3] = "CONFLICT: 24 files are conflicting with gnome-menus"
+PNBLACKLIST[gnome-menus3] ?= "CONFLICT: 24 files are conflicting with gnome-menus"
 # e.g. sysroots/qemux86-64/usr/share/desktop-directories/X-GNOME-Other.directory
 
 DEPENDS = "python libxml2 gconf popt gtk+3"
diff --git a/meta-gnome/recipes-gnome/gnome-panel/gnome-panel3_3.0.2.bb b/meta-gnome/recipes-gnome/gnome-panel/gnome-panel3_3.0.2.bb
index f89f3da9c9..972a4d4db0 100644
--- a/meta-gnome/recipes-gnome/gnome-panel/gnome-panel3_3.0.2.bb
+++ b/meta-gnome/recipes-gnome/gnome-panel/gnome-panel3_3.0.2.bb
@@ -4,7 +4,7 @@ LICENSE = "GPLv2 & LGPLv2 & GFDLv1.1"
 BPN = "gnome-panel"
 PR = "r1"
 
-PNBLACKLIST[gnome-panel3] = "CONFLICT: depends on libgweather3 which conflicts with libgweather"
+PNBLACKLIST[gnome-panel3] ?= "CONFLICT: depends on libgweather3 which conflicts with libgweather"
 
 # conflicts with gnome-panel, because they provide the same package
 # http://patches.openembedded.org/patch/43105/
diff --git a/meta-gnome/recipes-gnome/gweather/libgweather3_3.0.2.bb b/meta-gnome/recipes-gnome/gweather/libgweather3_3.0.2.bb
index 69cdd8f512..6e1997f775 100644
--- a/meta-gnome/recipes-gnome/gweather/libgweather3_3.0.2.bb
+++ b/meta-gnome/recipes-gnome/gweather/libgweather3_3.0.2.bb
@@ -4,7 +4,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263"
 SECTION = "x11/gnome/libs"
 DEPENDS = "libxml2 gconf libsoup-2.4 gtk+3"
 
-PNBLACKLIST[libgweather3] = "CONFLICT: 876 files are conflicting with libgweather"
+PNBLACKLIST[libgweather3] ?= "CONFLICT: 876 files are conflicting with libgweather"
 # e.g. sysroots/qemux86-64/usr/share/libgweather/locations.dtd
 #      sysroots/qemux86-64/usr/share/libgweather/Locations.zh_TW.xml
 
diff --git a/meta-gnome/recipes-gnome/zenity/zenity_2.32.1.bb b/meta-gnome/recipes-gnome/zenity/zenity_2.32.1.bb
index 3ea179e7c7..4e01c5c938 100644
--- a/meta-gnome/recipes-gnome/zenity/zenity_2.32.1.bb
+++ b/meta-gnome/recipes-gnome/zenity/zenity_2.32.1.bb
@@ -4,7 +4,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=3bf50002aefd002f49e7bb854063f7e7"
 
 PR = "r2"
 
-PNBLACKLIST[zenity] = "BROKEN: doesn't build with B!=S"
+PNBLACKLIST[zenity] ?= "BROKEN: doesn't build with B!=S"
 
 DEPENDS = "gtk+ glib-2.0 libnotify gnome-doc-utils"
 
diff --git a/meta-multimedia/recipes-mediacentre/xbmc/xbmc_git.bb b/meta-multimedia/recipes-mediacentre/xbmc/xbmc_git.bb
index 4b65152db5..17db7b51e8 100644
--- a/meta-multimedia/recipes-mediacentre/xbmc/xbmc_git.bb
+++ b/meta-multimedia/recipes-mediacentre/xbmc/xbmc_git.bb
@@ -10,7 +10,7 @@ DEPENDS = "libusb1 libcec libplist expat yajl gperf-native libxmu fribidi mpeg2d
 SRCREV = "82388d55dae79cbb2e486e307e23202e76a43efa"
 
 # multiple issues
-PNBLACKLIST[xbmc] = "/usr/include/c++/ctime:70:11: error: '::gmtime' has not been declared"
+PNBLACKLIST[xbmc] ?= "/usr/include/c++/ctime:70:11: error: '::gmtime' has not been declared"
 
 PV = "11.0+gitr${SRCPV}"
 PR = "r14"
diff --git a/meta-multimedia/recipes-multimedia/coriander/coriander_2.0.2.bb b/meta-multimedia/recipes-multimedia/coriander/coriander_2.0.2.bb
index 81e218f07d..a9f52cadb6 100755
--- a/meta-multimedia/recipes-multimedia/coriander/coriander_2.0.2.bb
+++ b/meta-multimedia/recipes-multimedia/coriander/coriander_2.0.2.bb
@@ -5,7 +5,7 @@ LICENSE = "GPL-3.0"
 LIC_FILES_CHKSUM = "file://COPYING;md5=d32239bcb673463ab874e80d47fae504"
 DEPENDS = "gtk+ libgnomeui libraw1394 libdc1394 libxv tiff"
 
-PNBLACKLIST[coriander] = "BROKEN: fails to use SDL probably because libsdl-config was removed, error: unknown type name 'SDL_Overlay'"
+PNBLACKLIST[coriander] ?= "BROKEN: fails to use SDL probably because libsdl-config was removed, error: unknown type name 'SDL_Overlay'"
 
 SRC_URI = "${SOURCEFORGE_MIRROR}/project/${BPN}/coriander-2/${PV}/${BP}.tar.gz \
            file://cross-compile.patch \
diff --git a/meta-multimedia/recipes-multimedia/dleyna/renderer-service-upnp_0.3.0.bb b/meta-multimedia/recipes-multimedia/dleyna/renderer-service-upnp_0.3.0.bb
index f82eae0eb3..68d59faca9 100644
--- a/meta-multimedia/recipes-multimedia/dleyna/renderer-service-upnp_0.3.0.bb
+++ b/meta-multimedia/recipes-multimedia/dleyna/renderer-service-upnp_0.3.0.bb
@@ -5,7 +5,7 @@ LICENSE = "LGPLv2.1"
 LIC_FILES_CHKSUM = "file://COPYING;md5=4fbd65380cdd255951079008b364516c \
                     file://src/renderer-service-upnp.c;beginline=1;endline=21;md5=c25c3082684eb4ca87474b7528c6dc15"
 
-PNBLACKLIST[renderer-service-upnp] = "BROKEN: doesn't build with B!=S (trying to install rendererconsole.py from ${B} instead of ${S})"
+PNBLACKLIST[renderer-service-upnp] ?= "BROKEN: doesn't build with B!=S (trying to install rendererconsole.py from ${B} instead of ${S})"
 
 DEPENDS = "dbus glib-2.0 gssdp gupnp gupnp-av gupnp-dlna libsoup-2.4"
 
diff --git a/meta-networking/recipes-support/lksctp-tools/lksctp-tools_1.0.16.bb b/meta-networking/recipes-support/lksctp-tools/lksctp-tools_1.0.16.bb
index e2551e1149..ded6d08a72 100644
--- a/meta-networking/recipes-support/lksctp-tools/lksctp-tools_1.0.16.bb
+++ b/meta-networking/recipes-support/lksctp-tools/lksctp-tools_1.0.16.bb
@@ -16,7 +16,7 @@ SRC_URI[sha256sum] = "0903dd526b7f30a89d5031aa2c82757612becc38ed7bc6e4f972f8deae
 #| /home/jenkins/oe/world/shr-core/tmp-eglibc/sysroots/x86_64-linux/usr/libexec/arm-oe-linux-gnueabi/gcc/arm-oe-linux-gnueabi/4.9.0/ld: error: symbol sctp_connectx has undefined version
 #| collect2: error: ld returned 1 exit status
 #| make[4]: *** [libsctp.la] Error 1
-PNBLACKLIST[lksctp-tools] = "BROKEN: fails to link against sctp_connectx symbol"
+PNBLACKLIST[lksctp-tools] ?= "BROKEN: fails to link against sctp_connectx symbol"
 
 S = "${WORKDIR}/${BP}"
 
diff --git a/meta-oe/recipes-connectivity/libimobiledevice/libimobiledevice_1.1.4.bb b/meta-oe/recipes-connectivity/libimobiledevice/libimobiledevice_1.1.4.bb
index 9f2cc49708..5256ce0d29 100644
--- a/meta-oe/recipes-connectivity/libimobiledevice/libimobiledevice_1.1.4.bb
+++ b/meta-oe/recipes-connectivity/libimobiledevice/libimobiledevice_1.1.4.bb
@@ -8,7 +8,7 @@ LIC_FILES_CHKSUM = "\
 #| configure:17888: checking for native large file support
 #| configure:17891: error: in `/home/jenkins/oe/shr-core-branches/shr-core/tmp-eglibc/work/core2-64-oe-linux/libimobiledevice/1.1.4-r0/libimobiledevice-1.1.4':
 #| configure:17893: error: cannot run test program while cross compiling
-PNBLACKLIST[libimobiledevice] = "cannot run test program while cross compiling"
+PNBLACKLIST[libimobiledevice] ?= "cannot run test program while cross compiling"
 
 HOMEPAGE ="http://www.libimobiledevice.org/"
 
diff --git a/meta-oe/recipes-connectivity/soft66/soft66_git.bb b/meta-oe/recipes-connectivity/soft66/soft66_git.bb
index 050bf98aa2..33ca2b5681 100644
--- a/meta-oe/recipes-connectivity/soft66/soft66_git.bb
+++ b/meta-oe/recipes-connectivity/soft66/soft66_git.bb
@@ -3,7 +3,7 @@ LICENSE = "GPLv3 LGPLv3+"
 LIC_FILES_CHKSUM = "file://COPYING;md5=f27defe1e96c2e1ecd4e0c9be8967949 \
                     file://COPYING.LESSER;md5=e6a600fd5e1d9cbde2d983680233ad02 "
 
-PNBLACKLIST[soft66] = "BROKEN: depends on broken libftdi"
+PNBLACKLIST[soft66] ?= "BROKEN: depends on broken libftdi"
 
 DEPENDS = "libftdi"
 
diff --git a/meta-oe/recipes-connectivity/zeroc-ice/zeroc-ice_3.5.1.bb b/meta-oe/recipes-connectivity/zeroc-ice/zeroc-ice_3.5.1.bb
index e39aa188c3..2b6f56ed4f 100644
--- a/meta-oe/recipes-connectivity/zeroc-ice/zeroc-ice_3.5.1.bb
+++ b/meta-oe/recipes-connectivity/zeroc-ice/zeroc-ice_3.5.1.bb
@@ -18,7 +18,7 @@ SRC_URI[sha256sum] = "989e51194c6adadbd156da3288e37bad847b93b3b876502e83033b7049
 #| /home/jenkins/oe/world/shr-core/tmp-eglibc/sysroots/x86_64-linux/usr/include/db_cxx.h:273:14: note: virtual int Db::set_bt_compare(int (*)(Db*, const Dbt*, const Dbt*, size_t*)) <near match>
 #| /home/jenkins/oe/world/shr-core/tmp-eglibc/sysroots/x86_64-linux/usr/include/db_cxx.h:273:14: note:   no known conversion for argument 1 from 'int (*)(DB*, const DBT*, const DBT*) {aka int (*)(__db*, const __db_dbt*, const __db_dbt*)}' to 'int (*)(Db*, const Dbt*, const Dbt*, size_t*) {aka int (*)(Db*, const Dbt*, const Dbt*, long unsigned int*)}'
 #| make[3]: *** [MapDb.o] Error 1
-PNBLACKLIST[zeroc-ice] = "BROKEN: not compatible with default db version"
+PNBLACKLIST[zeroc-ice] ?= "BROKEN: not compatible with default db version"
 
 S = "${WORKDIR}/Ice-${PV}"
 
diff --git a/meta-oe/recipes-extended/acpica/acpitests_20140828.bb b/meta-oe/recipes-extended/acpica/acpitests_20140828.bb
index 93c20af5e9..da2658218e 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 1edb19e355..22b9d2fd70 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 86a546e6e9..6dc40bf508 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"
 
diff --git a/meta-oe/recipes-graphics/clutter/clutter-box2d_git.bb b/meta-oe/recipes-graphics/clutter/clutter-box2d_git.bb
index b19110af23..194d1046fd 100644
--- a/meta-oe/recipes-graphics/clutter/clutter-box2d_git.bb
+++ b/meta-oe/recipes-graphics/clutter/clutter-box2d_git.bb
@@ -5,7 +5,7 @@ LIC_FILES_CHKSUM = "file://box2d/License.txt;md5=e5d39ad91f7dc4692dcdb1d85139ec6
 # 0.12.1+gitAUTOINC+de5452e56b-r1/git/clutter-box2d/clutter-box2d.h:226:47:
 #  fatal error: clutter-box2d/clutter-box2d-child.h: No such file or directory
 # |  #include <clutter-box2d/clutter-box2d-child.h>
-PNBLACKLIST[clutter-box2d] = "BROKEN: doesn't build with B!=S"
+PNBLACKLIST[clutter-box2d] ?= "BROKEN: doesn't build with B!=S"
 
 SRCREV = "de5452e56b537a11fd7f9453d048ff4b4793b5a2"
 PV = "0.12.1+git${SRCPV}"
diff --git a/meta-oe/recipes-graphics/fim/fim_0.4-rc1.bb b/meta-oe/recipes-graphics/fim/fim_0.4-rc1.bb
index 1d4e3317ab..90ac702164 100644
--- a/meta-oe/recipes-graphics/fim/fim_0.4-rc1.bb
+++ b/meta-oe/recipes-graphics/fim/fim_0.4-rc1.bb
@@ -8,7 +8,7 @@ HOMEPAGE = "http://www.autistici.org/dezperado/fim/"
 LICENSE = "GPLv2"
 LIC_FILES_CHKSUM = "file://COPYING;md5=fa01bff138cc98a62b8840a157951c88"
 
-PNBLACKLIST[fim] = "BROKEN: doesn't build with B!=S (flex: can't open lex.lex)"
+PNBLACKLIST[fim] ?= "BROKEN: doesn't build with B!=S (flex: can't open lex.lex)"
 
 # flex with provide /usr/include/FlexLexer.h
 DEPENDS = "flex-native bison-native flex"
diff --git a/meta-oe/recipes-graphics/xorg-driver/xf86-input-mtev_git.bb b/meta-oe/recipes-graphics/xorg-driver/xf86-input-mtev_git.bb
index a1943be0ae..547ec86c16 100644
--- a/meta-oe/recipes-graphics/xorg-driver/xf86-input-mtev_git.bb
+++ b/meta-oe/recipes-graphics/xorg-driver/xf86-input-mtev_git.bb
@@ -5,7 +5,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=8a71d0475d08eee76d8b6d0c6dbec543"
 
 DEPENDS += "pixman"
 
-PNBLACKLIST[xf86-input-mtev] = "BROKEN: doesn't build with B!=S (Makefile without ${S} in sed call)"
+PNBLACKLIST[xf86-input-mtev] ?= "BROKEN: doesn't build with B!=S (Makefile without ${S} in sed call)"
 
 SRC_URI = "git://gitorious.org/xorg/xf86-input-mtev.git file://fix-it.patch"
 SRCREV = "1eb469166ffc095c5801475f057f911f97a6e641"
diff --git a/meta-oe/recipes-multimedia/mplayer/mplayer2_git.bb b/meta-oe/recipes-multimedia/mplayer/mplayer2_git.bb
index 65fab1fda3..aa6c011680 100644
--- a/meta-oe/recipes-multimedia/mplayer/mplayer2_git.bb
+++ b/meta-oe/recipes-multimedia/mplayer/mplayer2_git.bb
@@ -13,7 +13,7 @@ RCONFLICTS_${PN} = "mplayer"
 LICENSE = "GPLv3"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=d32239bcb673463ab874e80d47fae504"
 
-PNBLACKLIST[mplayer2] = "Requires newer libav which has negative D_P"
+PNBLACKLIST[mplayer2] ?= "Requires newer libav which has negative D_P"
 
 SRC_URI = "git://repo.or.cz/mplayer.git \
     file://0001-configure-don-t-disable-ASS-support-when-explicitly-.patch \
diff --git a/meta-oe/recipes-navigation/omgps/omgps_svn.bb b/meta-oe/recipes-navigation/omgps/omgps_svn.bb
index 2304b3686e..aabdd43f17 100644
--- a/meta-oe/recipes-navigation/omgps/omgps_svn.bb
+++ b/meta-oe/recipes-navigation/omgps/omgps_svn.bb
@@ -9,7 +9,7 @@ PV = "0.1+svnr${SRCPV}"
 PR = "r2"
 S = "${WORKDIR}/${PN}"
 
-PNBLACKLIST[omgps] = "BROKEN: sound.c:61:35: error: 'saveptr' may be used uninitialized in this function [-Werror=maybe-uninitialized]"
+PNBLACKLIST[omgps] ?= "BROKEN: sound.c:61:35: error: 'saveptr' may be used uninitialized in this function [-Werror=maybe-uninitialized]"
 
 do_configure_prepend() {
     sed -i "s#PY_VERSION = 2.6#PY_VERSION = ${PYTHON_BASEVERSION}#g" ${S}/Makefile.am
diff --git a/meta-oe/recipes-qt/qconnman/qconnman-e_git.bb b/meta-oe/recipes-qt/qconnman/qconnman-e_git.bb
index baf802703d..e307a72c19 100644
--- a/meta-oe/recipes-qt/qconnman/qconnman-e_git.bb
+++ b/meta-oe/recipes-qt/qconnman/qconnman-e_git.bb
@@ -4,7 +4,7 @@ RCONFLICTS_${PN} = "qconnman"
 
 inherit qt4e
 
-PNBLACKLIST[qconnman-e] = "BROKEN: doesn't work with B!=S, ls: cannot access *.pro: No such file or directory"
+PNBLACKLIST[qconnman-e] ?= "BROKEN: doesn't work with B!=S, ls: cannot access *.pro: No such file or directory"
 
 EXTRA_QMAKEVARS_PRE += "PREFIX=/usr"
 EXTRA_OEMAKE += "INSTALL_ROOT=${D}"
diff --git a/meta-oe/recipes-qt/qconnman/qconnman_git.bb b/meta-oe/recipes-qt/qconnman/qconnman_git.bb
index e2bd2edc57..2f8cca25a0 100644
--- a/meta-oe/recipes-qt/qconnman/qconnman_git.bb
+++ b/meta-oe/recipes-qt/qconnman/qconnman_git.bb
@@ -4,7 +4,7 @@ RCONFLICTS_${PN} = "qconnman-e"
 
 inherit qt4x11
 
-PNBLACKLIST[qconnman] = "BROKEN: doesn't work with B!=S, ls: cannot access *.pro: No such file or directory"
+PNBLACKLIST[qconnman] ?= "BROKEN: doesn't work with B!=S, ls: cannot access *.pro: No such file or directory"
 
 EXTRA_QMAKEVARS_PRE += "PREFIX=/usr"
 EXTRA_OEMAKE += "INSTALL_ROOT=${D}"
diff --git a/meta-oe/recipes-sato/claws-mail/sylpheed_2.7.1.bb b/meta-oe/recipes-sato/claws-mail/sylpheed_2.7.1.bb
index 214ca5826e..1b010a5b6c 100644
--- a/meta-oe/recipes-sato/claws-mail/sylpheed_2.7.1.bb
+++ b/meta-oe/recipes-sato/claws-mail/sylpheed_2.7.1.bb
@@ -7,7 +7,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=4325afd396febcb659c36b49533135d4 \
 
 PR = "r2"
 
-PNBLACKLIST[sylpheed] = "BROKEN: Doesn't work with B!=S"
+PNBLACKLIST[sylpheed] ?= "BROKEN: Doesn't work with B!=S"
 
 SRC_URI = "http://sylpheed.sraoss.jp/sylpheed/v2.7/sylpheed-${PV}.tar.bz2 \
     file://glib-2.32.patch \
diff --git a/meta-oe/recipes-support/apcupsd/apcupsd_3.14.10.bb b/meta-oe/recipes-support/apcupsd/apcupsd_3.14.10.bb
index 4cd3f774c1..18979d574b 100644
--- a/meta-oe/recipes-support/apcupsd/apcupsd_3.14.10.bb
+++ b/meta-oe/recipes-support/apcupsd/apcupsd_3.14.10.bb
@@ -7,7 +7,7 @@ SRC_URI = "http://garr.dl.sourceforge.net/project/apcupsd/apcupsd%20-%20Stable/3
 SRC_URI[md5sum] = "5928822d855c5cf7ac29655e3e0b8c23"
 SRC_URI[sha256sum] = "0707b5ec9916fbde9e44eb8d18037c8d8f75dfd6aeef51aba5487e189eef2032"
 
-PNBLACKLIST[apcupsd] = "BROKEN: doesn't build with B!=S"
+PNBLACKLIST[apcupsd] ?= "BROKEN: doesn't build with B!=S"
 
 inherit autotools
 
diff --git a/meta-oe/recipes-support/emacs/emacs_23.4.bb b/meta-oe/recipes-support/emacs/emacs_23.4.bb
index 3db5da68dc..a32482883b 100644
--- a/meta-oe/recipes-support/emacs/emacs_23.4.bb
+++ b/meta-oe/recipes-support/emacs/emacs_23.4.bb
@@ -2,7 +2,7 @@ require emacs.inc
 
 PR = "r4"
 
-PNBLACKLIST[emacs] = "qemu: uncaught target signal 11 (Segmentation fault) - core dumped"
+PNBLACKLIST[emacs] ?= "qemu: uncaught target signal 11 (Segmentation fault) - core dumped"
 
 SRC_URI = "${GNU_MIRROR}/emacs/emacs-${PV}.tar.gz;name=tarball \
            file://use-qemu.patch \
diff --git a/meta-oe/recipes-support/maliit/maliit-framework_git.bb b/meta-oe/recipes-support/maliit/maliit-framework_git.bb
index f387ce26b1..3eb7f30dfc 100644
--- a/meta-oe/recipes-support/maliit/maliit-framework_git.bb
+++ b/meta-oe/recipes-support/maliit/maliit-framework_git.bb
@@ -6,7 +6,7 @@ LIC_FILES_CHKSUM = "file://LICENSE.LGPL;md5=5c917f6ce94ceb8d8d5e16e2fca5b9ad"
 
 inherit autotools qt4x11 gtk-immodules-cache
 
-PNBLACKLIST[maliit-framework] = "BROKEN: Wasn't updated to work with B!=S, maybe incorrectly inherits autotools"
+PNBLACKLIST[maliit-framework] ?= "BROKEN: Wasn't updated to work with B!=S, maybe incorrectly inherits autotools"
 
 DEPENDS = "libxcomposite dbus gtk+3 gtk+"
 
diff --git a/meta-oe/recipes-support/maliit/maliit-plugins_git.bb b/meta-oe/recipes-support/maliit/maliit-plugins_git.bb
index 0fa8ac25ef..3c040d87a7 100644
--- a/meta-oe/recipes-support/maliit/maliit-plugins_git.bb
+++ b/meta-oe/recipes-support/maliit/maliit-plugins_git.bb
@@ -6,7 +6,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=f29b21caa8e460097bfad9c026a33621"
 
 inherit autotools qt4x11
 
-PNBLACKLIST[maliit-plugins] = "BROKEN: depends on broken maliit-framework"
+PNBLACKLIST[maliit-plugins] ?= "BROKEN: depends on broken maliit-framework"
 
 DEPENDS = "maliit-framework"
 
diff --git a/meta-oe/recipes-support/openmotif/openmotif_2.3.3.bb b/meta-oe/recipes-support/openmotif/openmotif_2.3.3.bb
index ac4d188c5a..2baeda0251 100644
--- a/meta-oe/recipes-support/openmotif/openmotif_2.3.3.bb
+++ b/meta-oe/recipes-support/openmotif/openmotif_2.3.3.bb
@@ -7,7 +7,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=14f692c82491db3d52419929d2f3b343"
 
 PR = "r3"
 
-PNBLACKLIST[openmotif] = "BROKEN: doesn't build with B!=S"
+PNBLACKLIST[openmotif] ?= "BROKEN: doesn't build with B!=S"
 
 SRC_URI = "http://motif.ics.com/sites/default/files/openmotif-2.3.3.tar.gz \
            file://configure.patch;patch=1"
diff --git a/meta-oe/recipes-support/vala-terminal/vala-terminal_git.bb b/meta-oe/recipes-support/vala-terminal/vala-terminal_git.bb
index 78af9b62c5..07ff318203 100644
--- a/meta-oe/recipes-support/vala-terminal/vala-terminal_git.bb
+++ b/meta-oe/recipes-support/vala-terminal/vala-terminal_git.bb
@@ -8,7 +8,7 @@ PV = "1.3+gitr${SRCPV}"
 PE = "1"
 PR = "r1"
 
-PNBLACKLIST[vala-terminal] = "BROKEN: Doesn't work with B!=S, touch: cannot touch `src/.stamp': No such file or directory"
+PNBLACKLIST[vala-terminal] ?= "BROKEN: Doesn't work with B!=S, touch: cannot touch `src/.stamp': No such file or directory"
 
 inherit autotools perlnative vala
 
diff --git a/meta-webserver/recipes-php/modphp/modphp5.inc b/meta-webserver/recipes-php/modphp/modphp5.inc
index dcafa4fc31..f60c7bbfc8 100644
--- a/meta-webserver/recipes-php/modphp/modphp5.inc
+++ b/meta-webserver/recipes-php/modphp/modphp5.inc
@@ -20,7 +20,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=52dd90569008fee5bcdbb22d945b1108"
 
 inherit autotools pkgconfig
 
-PNBLACKLIST[modphp] = "CONFLICT: 466 header files conflict with php"
+PNBLACKLIST[modphp] ?= "CONFLICT: 466 header files conflict with php"
 # e.g. sysroots/qemux86-64/usr/include/php/main/win95nt.h
 
 CFLAGS += " -g -DPTYS_ARE_GETPT -DPTYS_ARE_SEARCHED -I${STAGING_INCDIR}/apache2"
diff --git a/meta-webserver/recipes-php/xdebug/xdebug_2.2.5.bb b/meta-webserver/recipes-php/xdebug/xdebug_2.2.5.bb
index 750b288458..66aff5e33e 100644
--- a/meta-webserver/recipes-php/xdebug/xdebug_2.2.5.bb
+++ b/meta-webserver/recipes-php/xdebug/xdebug_2.2.5.bb
@@ -4,7 +4,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=34df3a274aa12b795417c65634c07f16"
 
 DEPENDS = "modphp"
 
-PNBLACKLIST[xdebug] = "CONFLICT: depends on blocked modphp"
+PNBLACKLIST[xdebug] ?= "CONFLICT: depends on blocked modphp"
 
 SRC_URI = "http://xdebug.org/files/xdebug-${PV}.tgz"