/gstreamer-0.10.12/tests/examples/controller$ gcc -Wall $(pkg-config --cflags --libs gstreamer-0.10) audio-example.c -o audio-example
/tmp/ccUXbwbp.o: In function `main':
audio-example.c:(.text+0x58): undefined reference to `gst_controller_init'
audio-example.c:(.text+0x181): undefined reference to `gst_controller_new'
audio-example.c:(.text+0x1f5): undefined reference to `gst_controller_set_interpolation_mode'
audio-example.c:(.text+0x210): undefined reference to `gst_controller_set_interpolation_mode'
audio-example.c:(.text+0x25e): undefined reference to `gst_controller_set'
audio-example.c:(.text+0x299): undefined reference to `gst_controller_set'
audio-example.c:(.text+0x2d8): undefined reference to `gst_controller_set'
audio-example.c:(.text+0x317): undefined reference to `gst_controller_set'
audio-example.c:(.text+0x356): undefined reference to `gst_controller_set'
collect2: ld returned 1 exit status