Re: gnulib fails for build on Mac OS X 10.4: get_ppid_of.c:36:22: error: libproc.h: No such file or directory

[Paul Eggert]

On 12/9/21 04:28, Ryan Schmidt wrote:
(They used __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ instead of 
MAC_OS_X_VERSION_MIN_REQUIRED; the distinction is not clear to me. It might be 
that __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ is defined even if 
AvailabilityMacros.h is not included.)

I think you're right that __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ 
is predefined; see 
<https://opensource.apple.com/source/CarbonHeaders/CarbonHeaders-18.1/AvailabilityMacros.h.auto.html>.

There's a similar macro __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ 
for iOS.