HI! I was using gstreamer standard distributions from fedora repository, but needed to update them from source code to use latest version of appsrc/sink . My problem is when I link the application against libgstapp with the option of -lgstapp-0.10, I got some link errors. It seems like I am linking to old version of gst-plugins-base library. Error messages are as follows: ( oops! almost forgot to mentiion this. the code in main.cc is copy of exmplae code "appsink-src.c"); --------------------------------------------------------------------------------------------------- g++ -Wall -g `pkg-config --cflags gstreamer-0.10` `pkg-config --libs gstreamer-0.10` -lgstapp-0.10 -lgstinterfaces-0.10 -c main.cc g++ -Wall -g `pkg-config --cflags gstreamer-0.10` `pkg-config --libs gstreamer-0.10` -lgstapp-0.10 -lgstinterfaces-0.10 main.o -o appsinktest /usr/local/lib/libgstbase-0.10.so.0: undefined reference to `gst_util_seqnum_next' /usr/local/lib/libgstbase-0.10.so.0: undefined reference to `gst_message_set_seqnum' /usr/local/lib/libgstbase-0.10.so.0: undefined reference to `gst_event_set_seqnum' /usr/local/lib/libgstbase-0.10.so.0: undefined reference to `gst_event_get_seqnum' collect2: ld returned 1 exit status make: *** [appsinktest] Error 1 --------------------------------------------------------------------------------------------------- Is there any specific way to install the gstreamer package from source code? The package I installed from source: 1. gstreamer-0.10.23 2. gst-plugins-base-0.10.23 3. gst-plugins-good-0.10.15 4. gst-plugins-bad-0.10.13 5. gst-plugins-ugly-0.10.12 6. gst-ffmpeg-0.10.8 Once I did "export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig" What I did for every source package: 1. "./configure" 2. "make" 3. "sudo make install" Everything was okay. Am I missing something? Thank you in advance! Justin