hi all i'm very sorry.i think this is a newbie problem,but i want slove it. if i fellow [Building wayland -> Wayland applications] guide in web site get this configure: error ...... checking whether the gcc linker (/usr/bin/ld) supports shared libraries... yes checking whether -lc should be explicitly linked in... no checking dynamic linker characteristics... GNU/Linux ld.so checking how to hardcode library paths into programs... immediate checking whether stripping libraries is possible... yes checking if libtool supports shared libraries... yes checking whether to build shared libraries... yes checking whether to build static libraries... no checking for pkg-config... /usr/bin/pkg-config checking pkg-config is at least version 0.9.0... yes checking for dlopen... no checking for dlopen in -ldl... yes checking for COMPOSITOR... no <==========mebe has problem configure: error: Package requirements (wayland-server egl >= 7.10 glesv2 pixman-1 libpng) were not met: No package 'egl' found No package 'glesv2' found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables COMPOSITOR_CFLAGS and COMPOSITOR_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details. Other steps is finish but can't configure application. maybe a new version proble,but i can't slove it . i'm very sorry but ,i want play some wayland demo. THX!!