Performing C SOURCE FILE Test SUPPORTS_NO_AS_NEEDED failed with the following output:
Change Dir: /applications/amber20_src/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_11281/fast && /Library/Developer/CommandLineTools/usr/bin/make  -f CMakeFiles/cmTC_11281.dir/build.make CMakeFiles/cmTC_11281.dir/build
Building C object CMakeFiles/cmTC_11281.dir/src.c.o
/usr/bin/clang   -DSUPPORTS_NO_AS_NEEDED -Wl,--no-as-needed -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk -std=gnu99 -o CMakeFiles/cmTC_11281.dir/src.c.o -c /applications/amber20_src/build/CMakeFiles/CMakeTmp/src.c
clang: warning: -Wl,--no-as-needed: 'linker' input unused [-Wunused-command-line-argument]
Linking C executable cmTC_11281
/Applications/CMake.app/Contents/bin/cmake -E cmake_link_script CMakeFiles/cmTC_11281.dir/link.txt --verbose=1
/usr/bin/clang  -DSUPPORTS_NO_AS_NEEDED -Wl,--no-as-needed -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk -Wl,-search_paths_first -Wl,-headerpad_max_install_names CMakeFiles/cmTC_11281.dir/src.c.o -o cmTC_11281  /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/lib/libreadline.tbd 
ld: unknown option: --no-as-needed
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[1]: *** [cmTC_11281] Error 1
make: *** [cmTC_11281/fast] Error 2


Source file was:
int main(void) { return 0; }
Determining if the Perl module Chemistry::Mol exists failed with the following error output:
Can't locate Chemistry/Mol.pm in @INC (you may need to install the Chemistry::Mol module) (@INC contains: /Library/Perl/5.18/darwin-thread-multi-2level /Library/Perl/5.18 /Network/Library/Perl/5.18/darwin-thread-multi-2level /Network/Library/Perl/5.18 /Library/Perl/Updates/5.18.4 /System/Library/Perl/5.18/darwin-thread-multi-2level /System/Library/Perl/5.18 /System/Library/Perl/Extras/5.18/darwin-thread-multi-2level /System/Library/Perl/Extras/5.18 .) at -e line 1.
BEGIN failed--compilation aborted at -e line 1.