I tried compiling WWW::Curl::Easy by hand, but came across the same errors: 
[ns3:~/src/WWW-Curl-4.17] administrator% perl Makefile.PL 
The version is libcurl 7.58.0
Found curl.h in /usr/local/Cellar/curl/7.58.0/include/curl/curl.h
In file included from /usr/local/Cellar/curl/7.58.0/include/curl/curl.
+h:38:
In file included from /usr/local/Cellar/curl/7.58.0/include/curl/syste
+m.h:405:
In file included from /usr/include/sys/socket.h:81:
In file included from /usr/include/Availability.h:190:
/usr/include/AvailabilityInternal.h:22938:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_12
         ^
/usr/include/AvailabilityInternal.h:22867:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_11_4
         ^
/usr/include/AvailabilityInternal.h:22800:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_11_3
         ^
/usr/include/AvailabilityInternal.h:22737:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_11_2
         ^
/usr/include/AvailabilityInternal.h:22678:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_11
         ^
/usr/include/AvailabilityInternal.h:22623:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_10_3
         ^
/usr/include/AvailabilityInternal.h:22572:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_10_2
         ^
/usr/include/AvailabilityInternal.h:22525:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_10
         ^
/usr/include/AvailabilityInternal.h:22482:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_9
         ^
/usr/include/AvailabilityInternal.h:22443:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_8
         ^
/usr/include/AvailabilityInternal.h:22408:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_7
         ^
/usr/include/AvailabilityInternal.h:22377:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_6
         ^
/usr/include/AvailabilityInternal.h:22350:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_5
         ^
/usr/include/AvailabilityInternal.h:22327:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_4
         ^
/usr/include/AvailabilityInternal.h:22308:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_3
         ^
/usr/include/AvailabilityInternal.h:22293:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_2
         ^
/usr/include/AvailabilityInternal.h:22282:10: error: unterminated cond
+itional directive
        #if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_1
         ^
/usr/include/AvailabilityInternal.h:30:2: error: unterminated conditio
+nal directive
#ifndef __AVAILABILITY_INTERNAL__
 ^
In file included from /usr/local/Cellar/curl/7.58.0/include/curl/curl.
+h:38:
In file included from /usr/local/Cellar/curl/7.58.0/include/curl/syste
+m.h:405:
In file included from /usr/include/sys/socket.h:81:
/usr/include/Availability.h:239:2: error: #else without #if
#else
 ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
Building curlopt-constants.c for your libcurl version
Building Easy.pm constants for your libcurl version
Building Share.pm constants for your libcurl version
Checking if your kit is complete...
Looks good
Generating a Unix-style Makefile
Writing Makefile for WWW::Curl
Writing MYMETA.yml and MYMETA.json
[ns3:~/src/WWW-Curl-4.17] administrator%

[download]
From what I can tell, this is an issue with the compiler... the reported missing "unterminated conditional directive" is actually there, but indented (seriously?!?! that's a problem?!)
I went ahead and tried a make, but failed there too: 
[ns3:~/src/WWW-Curl-4.17] administrator% make
cp lib/WWW/Curl/Share.pm blib/lib/WWW/Curl/Share.pm
cp lib/WWW/Curl.pm blib/lib/WWW/Curl.pm
cp lib/WWW/Curl/Multi.pm blib/lib/WWW/Curl/Multi.pm
cp lib/WWW/Curl/Easy.pm blib/lib/WWW/Curl/Easy.pm
cp lib/WWW/Curl/Form.pm blib/lib/WWW/Curl/Form.pm
Running Mkbootstrap for WWW::Curl ()
chmod 644 "Curl.bs"
"/Users/administrator/perl5/perlbrew/perls/perl-5.24.0/bin/perl" "-Iin
+c" "/Users/administrator/perl5/perlbrew/perls/perl-5.24.0/lib/5.24.0/
+ExtUtils/xsubpp"  -typemap "/Users/administrator/perl5/perlbrew/perls
+/perl-5.24.0/lib/5.24.0/ExtUtils/typemap" -typemap "typemap"  Curl.xs
+ > Curl.xsc && mv Curl.xsc Curl.c
cc -c  -I/usr/local/Cellar/curl/7.58.0/include -fno-common -DPERL_DARW
+IN -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/i
+nclude -DPERL_USE_SAFE_PUTENV -O3   -DVERSION=\"4.17\" -DXS_VERSION=\
+"4.17\"  "-I/Users/administrator/perl5/perlbrew/perls/perl-5.24.0/lib
+/5.24.0/darwin-2level/CORE"   Curl.c
In file included from Curl.xs:574:
./curlopt-constants.c:19:58: error: non-void function 'constant' shoul
+d return a value [-Wreturn-type]
            if (strEQ(name, "DID_MEMORY_FUNC_TYPEDEFS")) return CURL_D
+ID_MEMORY_FUNC_TYPEDEFS;
                                                         ^
./curlopt-constants.c:136:49: error: use of undeclared identifier 'CUR
+L_STRICTER'
            if (strEQ(name, "STRICTER")) return CURL_STRICTER;
                                                ^
./curlopt-constants.c:179:56: warning: implicit conversion from 'size_
+t' (aka 'unsigned long') to 'int' changes value from 1844674407370955
+1615 to -1 [-Wconstant-conversion]
            if (strEQ(name, "ZERO_TERMINATED")) return CURL_ZERO_TERMI
+NATED;
                                                ~~~~~~ ^~~~~~~~~~~~~~~
+~~~~~
/usr/local/Cellar/curl/7.58.0/include/curl/curl.h:1969:31: note: expan
+ded from macro 'CURL_ZERO_TERMINATED'
#define CURL_ZERO_TERMINATED ((size_t) -1)
                              ^~~~~~~~~~~
In file included from Curl.xs:574:
./curlopt-constants.c:2145:44: warning: implicit conversion from 'unsi
+gned long' to 'int' changes value from 18446744073709551599 to -17 [-
+Wconstant-conversion]
            if (strEQ(name, "ANY")) return CURLAUTH_ANY;
                                    ~~~~~~ ^~~~~~~~~~~~
/usr/local/Cellar/curl/7.58.0/include/curl/curl.h:708:32: note: expand
+ed from macro 'CURLAUTH_ANY'
#define CURLAUTH_ANY          (~CURLAUTH_DIGEST_IE)
                               ^~~~~~~~~~~~~~~~~~~
In file included from Curl.xs:574:
./curlopt-constants.c:2146:48: warning: implicit conversion from 'unsi
+gned long' to 'int' changes value from 18446744073709551598 to -18 [-
+Wconstant-conversion]
            if (strEQ(name, "ANYSAFE")) return CURLAUTH_ANYSAFE;
                                        ~~~~~~ ^~~~~~~~~~~~~~~~
/usr/local/Cellar/curl/7.58.0/include/curl/curl.h:709:32: note: expand
+ed from macro 'CURLAUTH_ANYSAFE'
#define CURLAUTH_ANYSAFE      (~(CURLAUTH_BASIC|CURLAUTH_DIGEST_IE))
                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Curl.xs:1100:26: warning: implicit conversion from enumeration type 'C
+URLINFO' to different enumeration type 'CURLoption' [-Wenum-conversio
+n]
                curl_easy_setopt(easy, CURLINFO_PRIVATE, NULL);
                ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
/usr/local/Cellar/curl/7.58.0/include/curl/curl.h:2744:68: note: expan
+ded from macro 'curl_easy_setopt'
#define curl_easy_setopt(handle,opt,param) curl_easy_setopt(handle,opt
+,param)
                                           ~~~~~~~~~~~~~~~~        ^~~
4 warnings and 2 errors generated.
make: *** [Curl.o] Error 1
[ns3:~/src/WWW-Curl-4.17] administrator%

[download]
I'm completely dead in the water here. I've been trying to pull this off for over a year.

FYI, I checked my versions of curl and perl, and verified that they are the ones I expected: 
[ns3:~/src/WWW-Curl-4.17] administrator% which curl
/usr/local/opt/curl/bin/curl
[ns3:~/src/WWW-Curl-4.17] administrator% /usr/local/opt/curl/bin/curl 
+--version
curl 7.58.0 (x86_64-apple-darwin16.7.0) libcurl/7.58.0 SecureTransport
+ zlib/1.2.8
Release-Date: 2018-01-24
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps 
+pop3 pop3s rtsp smb smbs smtp smtps telnet tftp 
Features: AsynchDNS IPv6 Largefile NTLM NTLM_WB SSL libz UnixSockets 

[ns3:~/src/WWW-Curl-4.17] administrator% which perl
/Users/administrator/perl5/perlbrew/perls/perl-5.24.0/bin/perl
[ns3:~/src/WWW-Curl-4.17] administrator%

[download]

In reply to Re^3: installing WWW::Curl::Easy perl module in OS X 10.12.6 by igods
in thread installing WWW::Curl::Easy perl module in OS X 10.12.6 by igods

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