macOS Catalina 10.15.7 build error _XOPEN_SOURCE to be defined.

[alastairhm]

Hi,

I am tried to get Ruby setup and installed on my new Mac latop running 10.15.7 but running into the follow error about _XCODE_SOURCE.

amontgomery@WHM5006537 ~ % RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix [email protected]) --with-libyaml-dir=$(brew --prefix libyaml)" rbenv install 2.7.2
Downloading ruby-2.7.2.tar.bz2...
-> https://cache.ruby-lang.org/pub/ruby/2.7/ruby-2.7.2.tar.bz2
Installing ruby-2.7.2...
ruby-build: using readline from homebrew

BUILD FAILED (Mac OS X 10.15.7 using ruby-build 20201225-4-g02ce13c)

Inspect or clean up the working tree at /var/folders/6l/x0_g5lwn6qs493_6sfzwr3b80000gp/T/ruby-build.20210115092709.73250.yQfEKD
Results logged to /var/folders/6l/x0_g5lwn6qs493_6sfzwr3b80000gp/T/ruby-build.20210115092709.73250.log

Last 10 log lines:
compiling safe.c
compiling signal.c
In file included from signal.c:28:
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/ucontext.h:44:2: error: The deprecated ucontext routines require _XOPEN_SOURCE to be defined
#error The deprecated ucontext routines require _XOPEN_SOURCE to be defined
 ^
compiling sprintf.c
1 error generated.
make: *** [signal.o] Error 1
make: *** Waiting for unfinished jobs....

Full build log https://gist.github.com/alastairhm/df42cf014c7242e5e0490f45e96fa665