not compatible with autogen.sh

For the target, instead of using a makefile, I used ./autogen.sh and ./configure in target build, but when trying to generate the sievefuzz variant (by setting compiler and relevant flags to the afl-clang-fast with sievefuzz wrapper), it shows does not work /usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../x86_64-linux-gnu/crt1.o: In function _start':(.text+0x20): undefined reference to main' clang-9: error: linker command failed with exit code 1 (use -v to see invocation). I wonder is it because there is some incompatibility or there is a potential fix. Thank you.