[Paparazzi-devel] build makefile error under paparazzi center

[david]

Everyone,  
any idea what causing this makefile error ?
appears that a makefile should be in the conf directory , which is not
being created or is missing. 

this is only using paparazzicenter, builds fine otherwise 
am i missing a permission or symbolic link ? 

build is for Demo : target Sim 
although error is the same on all builds 


export PATH=/usr/bin:$PATH; make -C . -f Makefile.ac AIRCRAFT=DEMO
simmake: Entering directory `/home/david/paparazzi3'
DEMO
BUILD DEMO
make[1]: Entering directory `/home/david/paparazzi3'
BUILD var/DEMO/airframe.h
##################################################

 AIRFRAME MODEL: DEMO

##################################################
BUILD var/DEMO/radio.h
##################################################

 RADIO MODEL: T9cap

##################################################
BUILD var/DEMO/flight_plan.h
##################################################

 FLIGHT PLAN: Dummy

##################################################
BUILD var/DEMO/flight_plan.xml
BUILD var/DEMO/settings.h
BUILD var/DEMO/Makefile.ac
BUILD var/DEMO/periodic.h
make[1]: Leaving directory `/home/david/paparazzi3'
cd sw/airborne; make PAPARAZZI_SRC=/home/david/paparazzi3
PAPARAZZI_HOME=. TARGET=sim ARCHI=sim all
make[1]: Entering directory `/home/david/paparazzi3/sw/airborne'
Makefile:33: var/DEMO/Makefile.ac: No such file or directory
Makefile:36: ../../conf/Makefile.: No such file or directory
make[1]: *** No rule to make target `../../conf/Makefile.'.  Stop.
make[1]: Leaving directory `/home/david/paparazzi3/sw/airborne'
make: *** [sim] Error 2
make: Leaving directory `/home/david/paparazzi3'

DONE (export PATH=/usr/bin:$PATH; make -C . -f Makefile.ac AIRCRAFT=DEMO
sim 2>&1)

thanks 
Dave