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DiFX compiles and runs but has not been extensively tested. Xcode must have been installed. Recommended to then use “Brew” to satisfy external dependencies. Specifically install:

• openmpi gcc fftw libtool pkg-config automake autoconf gawk pgplot bison

Starting with Mojave, Apple seems to be less interested in a canonical unix-type OS. The Xcode install process now is (all as root or sudo):

• download Xcode from Apple store
• xcode-select –install
• xcodebuild -license
• installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /

That last step is to have /usr/include appear. Apparently it is now buried in the SDK somewhere and you can see it with

• xcrun –show-sdk-path

OSX ships with a very old version of bison, which fails to compile the vex parses. Brew also refuses to install in a way which overrides syste, default. So you also need to

• export PATH=“/usr/local/opt/bison/bin:$PATH”