AIX 7.3 has 32 and 64 bit curl libraries, Makefile.PL needs to select the correct curl-config_xx

[thomasseeling-ibm]

IBM delivers AIX 7.3 with perl 5.38 in both 32 and 64 bit flavours, and curl-devel does the same.
curl-config is symlinked to curl-config_64 at install.
If I use perl 32 bit then Makefile.PL needs to choose curl-config_32 instead.
Nice enough there's an option to override the filename.
This should be mentioned in the documentation.

if perl -V | grep -q "ccflags.*32 " then CURL_CONFIG=curl-config_32 else CURL_CONFIG=curl-config_64 fi export CURL_CONFIG