gst_sharp_c_abi link error

$ ninja -C build

[6/51] Linking target sources/gst_sharp_c_abi
FAILED: sources/gst_sharp_c_abi 
cc  -o sources/gst_sharp_c_abi sources/gst_sharp_c_abi.p/generated_gstreamer-sharp-abi.c.o -Wl,--as-needed -Wl,--no-undefined -Wl,--start-group /usr/local/lib/x86_64-linux-gnu/libgstreamer-1.0.so /usr/lib/x86_64-linux-gnu/libgobject-2.0.so /usr/lib/x86_64-linux-gnu/libglib-2.0.so /usr/local/lib/x86_64-linux-gnu/libgstapp-1.0.so /usr/local/lib/x86_64-linux-gnu/libgstbase-1.0.so /usr/local/lib/x86_64-linux-gnu/libgstaudio-1.0.so /usr/local/lib/x86_64-linux-gnu/libgsttag-1.0.so /usr/local/lib/x86_64-linux-gnu/libgstcontroller-1.0.so /usr/local/lib/x86_64-linux-gnu/libgstfft-1.0.so -lm /usr/local/lib/x86_64-linux-gnu/libgstnet-1.0.so /usr/lib/x86_64-linux-gnu/libgio-2.0.so /usr/local/lib/x86_64-linux-gnu/libgstpbutils-1.0.so /usr/local/lib/x86_64-linux-gnu/libgstvideo-1.0.so /usr/local/lib/x86_64-linux-gnu/libgstriff-1.0.so /usr/local/lib/x86_64-linux-gnu/libgstrtp-1.0.so /usr/local/lib/x86_64-linux-gnu/libgstrtsp-1.0.so /usr/local/lib/x86_64-linux-gnu/libgstsdp-1.0.so /usr/local/lib/x86_64-linux-gnu/libgstwebrtc-1.0.so -Wl,--end-group
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x24): undefined reference to `main'