[ardour-users] Plugin automation

[Multimediarts]

hello i have a problem to compile ardour 2.

scons output : 
scons: Reading SConscript files ...
Package sndfile was not found in the pkg-config search path.
Perhaps you should add the directory containing `sndfile.pc'
to the PKG_CONFIG_PATH environment variable
No package 'sndfile' found
Package lrdf was not found in the pkg-config search path.
Perhaps you should add the directory containing `lrdf.pc'
to the PKG_CONFIG_PATH environment variable
No package 'lrdf' found
Package raptor was not found in the pkg-config search path.
Perhaps you should add the directory containing `raptor.pc'
to the PKG_CONFIG_PATH environment variable.........

....and other  .pc file


i have this file in /usr/lib/pkgconfig.

i try 
PKG_CONFIG_PATH=/usr/lib/pkgconfig  

and run scons after but no result

i try this to 

scons PKG_CONFIG_PATH=/usr/lib/pkgconfig
no result.

somebody can help me ?

Thanks 
Olivier