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+# -O2 -> Perform second-level optimisations.
+# Not -Os because PPC64 machines aren't starved for space.
+# -ggdb -> Generate GDB debugging information.
+# This is used with splitdebug to make -dbg split packages.
+# -mcpu=970 -> Require a Power4+ "970" or higher CPU.
+# -mtune=power9 -> Tune for Power9 machines.
+# -maltivec -> Always enable AltiVec.
+# AltiVec extensions are available on every CPU we target.
+# -mlong-dou... -> Ensure musl ABI is followed.
+export CFLAGS="-O2 -ggdb -mcpu=970 -mtune=power9 -maltivec -mlong-double-64"
+export CXXFLAGS="$CFLAGS"
+export LDFLAGS="-Wl,--as-needed"
+export JOBS=64
+export MAKEFLAGS=-j$JOBS
+
+export DEFAULT_DBG="YesPlease"