--- a/configure.ac 2017-10-31 21:42:06.000000000 +0100 +++ b/configure.ac 2022-03-15 02:06:45.646440624 +0100 @@ -37,7 +37,7 @@ PKG_PROG_PKG_CONFIG([0.25]) - PKG_CHECK_MODULES([CRYPTOPP],[libcrypto++]) + PKG_CHECK_MODULES([CRYPTOPP],[libcryptopp]) #crypto++ headers are either in include/crypto++ or include/cryptopp, #the information is otherwise unavailable from standard configuration