curl.sh: enable GSS-API on macOS

Also add `-nogss` option to disable it.

Author: vszakats

README.md

@@ -85,6 +85,7 @@ asyn-rr       | ✓       | ✓       | ✓       |         |         |
 AsynchDNS     | ✓       | ✓       | ✓       | ✓       | ✓       | ✓       | ✓       | ✓       |
 brotli        | ✓       | ✓       | ✓       | ✓       |         |         |         |         |
 CAcert        | ✓       | ✓       |         | ✓¹      | ✓¹      | ✓¹      | ✓¹      | ✓¹      |
+GSS-API       |         |         | ✓       | ✓¹      |         |         |         |         |
 HSTS          | ✓       | ✓       | ✓       | ✓       | ✓       | ✓       | ✓       | ✓       |
 HTTP2         | ✓       | ✓       | ✓       | ✓       | ✓       | ✓       |         |         |
 HTTP3         | ✓       | ✓       | ✓       |         |         |         |         |         |

_build.sh

@@ -47,6 +47,7 @@ set -o xtrace -o errexit -o nounset; [ -n "${BASH:-}${ZSH_NAME:-}" ] && set -o p
 #        nohttp     build without HTTP and proxy support
 #        nocookie   build without cookie support
 #        noproxy    build without proxy support
+#        nogss      build without GSS-API support (for mac target. Other targets do not have it enabled)
 #        imap       build with IMAP protocol (for zero, bldtst or pico build)
 #        awslc      build with AWS-LC [EXPERIMENTAL]
 #        boringssl  build with BoringSSL [EXPERIMENTAL]

curl.sh

@@ -94,6 +94,10 @@ _VER="$1"
 
   if [[ ! "${_CONFIG}" =~ (zero|bldtst|pico|nano|micro|mini) ]]; then
     options+=' -DUSE_SSLS_EXPORT=ON'
+
+    if [ "${_OS}" = 'mac' ] && [[ "${_CONFIG}" != *'nogss'* ]]; then
+      options+=' -DCURL_USE_GSSAPI=ON'
+    fi
   fi
 
   # for H2/H3