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CCFLAGS    => $devel_cflags . ' ' . $curl{cflags} . $bits,
that needs to be modified to:
CCFLAGS    => $Config::Config{ccflags} . ' ' . $devel_cflags . ' ' . $
+curl{cflags} . $bits,

--- Curl.xs_orig        2019-11-20 11:44:50 +1100
+++ Curl.xs     2019-11-20 22:55:23 +1100
...
 #include <curl/curl.h>
 #include <curl/easy.h>
 #include <curl/multi.h>

--- Curl_multi.xsh_orig 2019-11-20 11:54:58 +1100
+++ Curl_multi.xsh      2019-11-20 11:55:35 +1100
...
        PREINIT:
                int remaining;
                CURLMcode ret;