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diff --git a/lib/dev/Makefile b/lib/dev/Makefile
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+++ b/lib/dev/Makefile
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+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+MAKEFILE_CVS_ID = "@(#) $RCSfile$ $Revision$ $Date$"
+
+include manifest.mn
+include $(CORE_DEPTH)/coreconf/config.mk
+include config.mk
+include $(CORE_DEPTH)/coreconf/rules.mk
+
+# On AIX 4.3, IBM xlC_r compiler (version 3.6.6) cannot compile
+# ckhelper.c in 64-bit mode for unknown reasons. A workaround is
+# to compile it with optimizations turned on. (Bugzilla bug #63815)
+ifeq ($(OS_TARGET)$(OS_RELEASE),AIX4.3)
+ifeq ($(USE_64),1)
+ifndef BUILD_OPT
+$(OBJDIR)/ckhelper.o: ckhelper.c
+ @$(MAKE_OBJDIR)
+ $(CC) -o $@ -c -O2 $(CFLAGS) $<
+endif
+endif
+endif
+
+export:: private_export