I've noted that when build OpenSSL using MSVC, some empty directories are created: ./crypto/include ./crypto/providers I configured with: perl.exe -I. -I./util/perl Configure VC-WIN32-ONECORE no-makedepend enable-zlib enable-trace enable-md2 no-ec_nistp_64_gcc_128 enable-asan enable-aria enable-rc5 enable-heartbeats --prefix=/foo/bar --openssldir=/foo/bar I see that the generated Makefile has lots of '-I "crypto\include"'. AFAICS needlessly. But I see no 'mkdir crypto\include' anywhere. And I don't see 'mkdir-p.pl' is used to create these. So how are these empty directories created/used? -- --gv