I treid that but still got the undefined reference error 
in cflags i now have have this:
cflags:
{
//-I /home/reinhard/.leaf/wp85-toolchain_SWI9X15Y_07.14.01.00-linux64/sysroots/armv7a-neon-poky-linux-gnueabi/usr/include/libxml2/include/
-I /home/reinhard/.leaf/wp76-toolchain_SWI9X07Y_02.37.07.00-linux64/sysroots/armv7a-neon-poky-linux-gnueabi/usr/include/libxml2
}