+# - pgac_cv_prog_cc_ldflags__Wl___as_needed: Inform that the linker supports as-needed. It's
+# not stricly necessary but avoids unnecessary linking of binaries.
+# - USE_UNNAMED_POSIX_SEMAPHORES: Avoid using System V semaphores which are disabled on Android.
+# - with-system-tzdata: Doesn't currently work as Android uses a single timezone file. But
+# if not specified the build uses zic to build timezone files using hard links, which doesn't
+# work on Android 6.0+. TODO: Either patch to work with the combined timezone file, or
+# replace the hard links with symlinks.