The link to the pcre source tar ball is out of date: https://github.com/cpp-pm/hunter/blob/132dc3c571e41764da09c8752ac590aaf2e9bf10/cmake/projects/libpcre/hunter.cmake#L19 The "ftp.pcre.org" site has been decommissioned, looks like it was moved to sourceforge -- https://sourceforge.net/projects/pcre/files/pcre/8.41/
The link to the pcre source tar ball is out of date:
hunter/cmake/projects/libpcre/hunter.cmake
Line 19 in 132dc3c
The "ftp.pcre.org" site has been decommissioned, looks like it was moved to sourceforge -- https://sourceforge.net/projects/pcre/files/pcre/8.41/