can't build neither for 7.54 nor for 7.55

if I leave the script as is I am getting the error:

url.c:55:2: error: "We can't compile without socket() support!"

If I change IPHONEOS_DEPLOYMENT_TARGET to anything which is higher than 6.0 the compiler detection fails.

checking for a BSD-compatible install... /usr/bin/install -c
checking for i386-apple-darwin-gcc... clang
checking whether the C compiler works... no
configure: error: in `/Users/xxxxxxxxxx/Documents/curl-7.55.0':
configure: error: C compiler cannot create executables