[meta-freescale] gstreamer1.0-plugins-imx error

[idealsim]

Hi all, today i have a problem to build gstreamer1.0-plugins-imx in pyro  
branch. I have had  packagegroup-fsl-gstreamer1.0-full to my image (with  
LICENSE_FLAGS_WHITELIST += " commercial"). Now when i'm trying to build my  
image i have an error during the configure step of  
gstreamer1.0-plugins-imx. Apparently it don't fing pkg-config in my pc ...  
but is it installed ! See under the error that i have (complete log join) :

Checking for program pkg-config
not found
find program=['pkg-config']  
paths=['/media/modjo/data1TO/yocto/pyro/quadBuild/tmp/sysroots-uninative/x86_64-linux/usr/bin',  
'/media/modjo/data1TO/yocto/pyro/sources/poky/scripts',  
'/media/modjo/data1TO/yocto/pyro/quadBuild/tmp/work/udooqdl-poky-linux-gnueabi/gstreamer1.0-plugins-imx/0.12.2-r0/recipe-sysroot-native/usr/bin/arm-poky-linux-gnueabi',  
'/media/modjo/data1TO/yocto/pyro/quadBuild/tmp/work/udooqdl-poky-linux-gnueabi/gstreamer1.0-plugins-imx/0.12.2-r0/recipe-sysroot/usr/bin/crossscripts',  
'/media/modjo/data1TO/yocto/pyro/quadBuild/tmp/work/udooqdl-poky-linux-gnueabi/gstreamer1.0-plugins-imx/0.12.2-r0/recipe-sysroot-native/usr/sbin',  
'/media/modjo/data1TO/yocto/pyro/quadBuild/tmp/work/udooqdl-poky-linux-gnueabi/gstreamer1.0-plugins-imx/0.12.2-r0/recipe-sysroot-native/usr/bin',  
'/media/modjo/data1TO/yocto/pyro/quadBuild/tmp/work/udooqdl-poky-linux-gnueabi/gstreamer1.0-plugins-imx/0.12.2-r0/recipe-sysroot-native/sbin',  
'/media/modjo/data1TO/yocto/pyro/quadBuild/tmp/work/udooqdl-poky-linux-gnueabi/gstreamer1.0-plugins-imx/0.12.2-r0/recipe-sysroot-native/bin',  
'/media/modjo/data1TO/yocto/pyro/sources/poky/bitbake/bin',  
'/media/modjo/data1TO/yocto/pyro/quadBuild/tmp/hosttools'] var='PKGCONFIG'  
-> ''
 from  
/media/modjo/data1TO/yocto/pyro/quadBuild/tmp/work/udooqdl-poky-linux-gnueabi/gstreamer1.0-plugins-imx/0.12.2-r0/git:  
Could not find the program pkg-config

Any idea where is the issue ?

regards,

Mickaël
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