nixpkgs/pkgs/os-specific/bsd/netbsd/compat-setup-hook.sh

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setupCompatFlags() {
# The `depHostOffset` describes how the host platform of the dependencies
# are slid relative to the depending package. It is brought into scope of
# the environment hook defined as the role of the dependency being applied.
case $depHostOffset in
-1) local role='BUILD_' ;;
0) local role='' ;;
1) local role='TARGET_' ;;
*) echo "cc-wrapper: Error: Cannot be used with $depHostOffset-offset deps" >2;
return 1 ;;
esac
export NIX_${role}LDFLAGS+=" -lnbcompat"
export NIX_${role}CFLAGS_COMPILE+=" -DHAVE_NBTOOL_CONFIG_H"
export NIX_${role}CFLAGS_COMPILE+=" -include nbtool_config.h"
}
addEnvHooks "$hostOffset" setupCompatFlags