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Unable to install Firedrake on Mac #3465

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There appears to have been no progress made by PETSc on this. We may however have a workaround. A very helpful user (@lrtfm) on Slack said:

If you prefer not to downgrade your Xcode, here are some alternative ways to overcome the issues.
Edit the script firedrake-install at line786:

petsc_options.add("--CFLAGS=-Wno-implicit-function-declaration")

            petsc_options.add("--CFLAGS=-Wno-implicit-function-declaration")

to

            petsc_options.add("--CFLAGS=-Wno-implicit-function-declaration -Wno-int-conversion -Wno-deprecated-non-prototype -Wno-implicit-int")

to overcome the issue for now.
Here, -Wno-depre…

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@JDBetteridge
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Answer selected by connorjward
@lrtfm
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