--- /dev/null
+++ Libc/Libc-763.11/Makefile.features
@@ -0,0 +1,135 @@
+.include "Platforms/${RC_TARGET_CONFIG}/Makefile.inc"
+
+# Have to use || to avoid warning message if && is used
+.ifdef CCARCH
+_BLOCKS != ${MYCC} -arch ${CCARCH} -E -dD -x c /dev/null | fgrep -q __BLOCKS__ || echo NO
+.if ${_BLOCKS} != NO
+FEATURE_BLOCKS = YES
+.endif # _BLOCKS
+.endif # CCARCH
+_LIBCRASHREPORTERCLIENT_A = ${SDKROOT}/usr/local/lib/libCrashReporterClient.a
+_LIBCRASHREPORTERCLIENT != test -f ${_LIBCRASHREPORTERCLIENT_A} || echo NO
+.if ${_LIBCRASHREPORTERCLIENT} == NO
+FEATURE_NO_LIBCRASHREPORTERCLIENT = YES
+.endif # !_LIBCRASHREPORTERCLIENT
+
+${SYMROOTINC}/${MACHINE_ARCH}/libc-features.h:
+	${MKDIR} ${.TARGET:H}
+	${ECHO} creating ${.TARGET}
+	@echo '#ifndef _LIBC_FEATURES_H_' > ${.TARGET}
+	@echo '#define _LIBC_FEATURES_H_' >> ${.TARGET}
+	@echo >> ${.TARGET}
+.ifdef FEATURE_LEGACY_RUNE_APIS
+	@echo '#define UNIFDEF_LEGACY_RUNE_APIS 1' >> ${.TARGET}
+.else
+	@echo '/* #undef UNIFDEF_LEGACY_RUNE_APIS */' >> ${.TARGET}
+.endif
+.ifdef FEATURE_LEGACY_CRT1_ENVIRON
+	@echo '#define LEGACY_CRT1_ENVIRON 1' >> ${.TARGET}
+.else
+	@echo '/* #undef LEGACY_CRT1_ENVIRON */' >> ${.TARGET}
+.endif
+.ifdef FEATURE_LEGACY_UTMP_APIS
+	@echo '#define UNIFDEF_LEGACY_UTMP_APIS 1' >> ${.TARGET}
+.else
+	@echo '/* #undef UNIFDEF_LEGACY_UTMP_APIS */' >> ${.TARGET}
+.endif
+.ifdef FEATURE_MOVE_LOCALTIME
+	@echo '#define UNIFDEF_MOVE_LOCALTIME 1' >> ${.TARGET}
+.else
+	@echo '/* #undef UNIFDEF_MOVE_LOCALTIME */' >> ${.TARGET}
+.endif
+.ifdef FEATURE_ONLY_LONG_DOUBLE_IS_DOUBLE
+	@echo '#if !__DARWIN_LONG_DOUBLE_IS_DOUBLE' >> ${.TARGET}
+	@echo '#  error Feature mismatch: __DARWIN_LONG_DOUBLE_IS_DOUBLE == 0' >> ${.TARGET}
+	@echo '#endif /* !__DARWIN_LONG_DOUBLE_IS_DOUBLE */' >> ${.TARGET}
+	@echo '#define LDBL_COMPAT 1' >> ${.TARGET}
+.else
+	@echo '#if __DARWIN_LONG_DOUBLE_IS_DOUBLE' >> ${.TARGET}
+	@echo '#  if !defined(LDBL_COMPAT)' >> ${.TARGET}
+	@echo '#    error Feature mismatch: __DARWIN_LONG_DOUBLE_IS_DOUBLE == 1' >> ${.TARGET}
+	@echo '#  endif /* !LDBL_COMPAT */' >> ${.TARGET}
+	@echo '#elif defined(LDBL_COMPAT)' >> ${.TARGET}
+	@echo '#  error Feature mismatch: __DARWIN_LONG_DOUBLE_IS_DOUBLE == 0' >> ${.TARGET}
+	@echo '#endif /* LDBL_COMPAT */' >> ${.TARGET}
+.endif
+.ifdef FEATURE_ONLY_1050_VARIANTS
+	@echo '#if !__DARWIN_ONLY_VERS_1050' >> ${.TARGET}
+	@echo '#  error Feature mismatch: __DARWIN_ONLY_VERS_1050 == 0' >> ${.TARGET}
+	@echo '#endif /* !__DARWIN_ONLY_VERS_1050 */' >> ${.TARGET}
+.else
+	@echo '#if __DARWIN_ONLY_VERS_1050' >> ${.TARGET}
+	@echo '#  error Feature mismatch: __DARWIN_ONLY_VERS_1050 == 1' >> ${.TARGET}
+	@echo '#endif /* __DARWIN_ONLY_VERS_1050 */' >> ${.TARGET}
+.endif
+.ifdef FEATURE_ONLY_UNIX_CONFORMANCE
+	@echo '#if !__DARWIN_ONLY_UNIX_CONFORMANCE' >> ${.TARGET}
+	@echo '#  error Feature mismatch: __DARWIN_ONLY_UNIX_CONFORMANCE == 0' >> ${.TARGET}
+	@echo '#endif /* !__DARWIN_ONLY_UNIX_CONFORMANCE */' >> ${.TARGET}
+.else
+	@echo '#if __DARWIN_ONLY_UNIX_CONFORMANCE' >> ${.TARGET}
+	@echo '#  error Feature mismatch: __DARWIN_ONLY_UNIX_CONFORMANCE == 1' >> ${.TARGET}
+	@echo '#endif /* __DARWIN_ONLY_UNIX_CONFORMANCE */' >> ${.TARGET}
+.endif
+.ifdef FEATURE_ONLY_64_BIT_INO_T
+	@echo '#if !__DARWIN_ONLY_64_BIT_INO_T' >> ${.TARGET}
+	@echo '#  error Feature mismatch: __DARWIN_ONLY_64_BIT_INO_T == 0' >> ${.TARGET}
+	@echo '#endif /* !__DARWIN_ONLY_64_BIT_INO_T */' >> ${.TARGET}
+.else
+	@echo '#if __DARWIN_ONLY_64_BIT_INO_T' >> ${.TARGET}
+	@echo '#  error Feature mismatch: __DARWIN_ONLY_64_BIT_INO_T == 1' >> ${.TARGET}
+	@echo '#endif /* __DARWIN_ONLY_64_BIT_INO_T */' >> ${.TARGET}
+.endif
+.ifdef FEATURE_PATCH_3417676
+	@echo '#define __APPLE_PR3417676_HACK__ 1' >> ${.TARGET}
+.else
+	@echo '/* #undef __APPLE_PR3417676_HACK__ */' >> ${.TARGET}
+.endif
+.ifdef FEATURE_PATCH_5243343
+	@echo '#define PR_5243343 1' >> ${.TARGET}
+.else
+	@echo '/* #undef PR_5243343 */' >> ${.TARGET}
+.endif
+.ifdef FEATURE_PLOCKSTAT
+	@echo '#define PLOCKSTAT 1' >> ${.TARGET}
+.else
+	@echo '/* #undef PLOCKSTAT */' >> ${.TARGET}
+.endif
+.ifdef FEATURE_TIMEZONE_CHANGE_NOTIFICATION
+	@echo '#define NOTIFY_TZ 1' >> ${.TARGET}
+.else
+	@echo '/* #undef NOTIFY_TZ */' >> ${.TARGET}
+.endif
+.ifdef FEATURE_NO_LIBCRASHREPORTERCLIENT
+	@echo '#define LIBC_NO_LIBCRASHREPORTERCLIENT 1' >> ${.TARGET}
+.else
+	@echo '/* #undef LIBC_NO_LIBCRASHREPORTERCLIENT */' >> ${.TARGET}
+.endif
+	@echo >> ${.TARGET}
+	@echo '#endif /* _LIBC_FEATURES_H_ */' >> ${.TARGET}
+
+.ifdef FEATURE_BLOCKS
+UNIFDEFARGS += -DUNIFDEF_BLOCKS
+.else
+UNIFDEFARGS += -UUNIFDEF_BLOCKS
+.endif
+.ifdef FEATURE_LEGACY_64_APIS
+UNIFDEFARGS += -DUNIFDEF_LEGACY_64_APIS
+.else
+UNIFDEFARGS += -UUNIFDEF_LEGACY_64_APIS
+.endif
+.ifdef FEATURE_LEGACY_RUNE_APIS
+UNIFDEFARGS += -DUNIFDEF_LEGACY_RUNE_APIS
+.else
+UNIFDEFARGS += -UUNIFDEF_LEGACY_RUNE_APIS
+.endif
+.ifdef FEATURE_LEGACY_UTMP_APIS
+UNIFDEFARGS += -DUNIFDEF_LEGACY_UTMP_APIS
+.else
+UNIFDEFARGS += -UUNIFDEF_LEGACY_UTMP_APIS
+.endif
+.ifdef FEATURE_MOVE_LOCALTIME
+UNIFDEFARGS += -DUNIFDEF_MOVE_LOCALTIME
+.else
+UNIFDEFARGS += -UUNIFDEF_MOVE_LOCALTIME
+.endif