nixpkgs/pkgs/os-specific/darwin/apple-sdk/cf-setup-hook.sh

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linkSystemCoreFoundationFramework() {
NIX_CFLAGS_COMPILE="-F@out@/Library/Frameworks${NIX_CFLAGS_COMPILE:+ }${NIX_CFLAGS_COMPILE-}"
# gross! many symbols (such as _OBJC_CLASS_$_NSArray) are defined in system CF, but not
# in the opensource release
# if the package needs private headers, we assume they also want to link with system CF
NIX_LDFLAGS+=" /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation"
}
preConfigureHooks+=(linkSystemCoreFoundationFramework)