Determining if the function smtp_create_session exists in the esmtp failed with the following output:
Change Dir: /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/log4cxx-0.12.0/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/gmake cmTC_98848/fast && gmake[1]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/log4cxx-0.12.0/CMakeFiles/CMakeTmp'
/usr/bin/gmake  -f CMakeFiles/cmTC_98848.dir/build.make CMakeFiles/cmTC_98848.dir/build
gmake[2]: Entering directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/log4cxx-0.12.0/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_98848.dir/CheckFunctionExists.cxx.o
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/bin/arm-buildroot-linux-gnueabihf-g++ --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/arm-buildroot-linux-gnueabihf/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -g0 -D_FORTIFY_SOURCE=1 -DCHECK_FUNCTION_EXISTS=smtp_create_session   -std=c++17 -o CMakeFiles/cmTC_98848.dir/CheckFunctionExists.cxx.o -c /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/log4cxx-0.12.0/CMakeFiles/CheckLibraryExists/CheckFunctionExists.cxx
Linking CXX executable cmTC_98848
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_98848.dir/link.txt --verbose=1
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/bin/arm-buildroot-linux-gnueabihf-g++ --sysroot=/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/arm-buildroot-linux-gnueabihf/sysroot  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -g0 -D_FORTIFY_SOURCE=1 -DCHECK_FUNCTION_EXISTS=smtp_create_session    CMakeFiles/cmTC_98848.dir/CheckFunctionExists.cxx.o  -o cmTC_98848  -lesmtp 
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/host/lib/gcc/arm-buildroot-linux-gnueabihf/11.2.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: cannot find -lesmtp
collect2: error: ld returned 1 exit status
gmake[2]: *** [cmTC_98848] Error 1
gmake[2]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/log4cxx-0.12.0/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTC_98848/fast] Error 2
gmake[1]: Leaving directory `/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/log4cxx-0.12.0/CMakeFiles/CMakeTmp'