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diff --git a/libparc/parc/algol/parc_AtomicInteger.h b/libparc/parc/algol/parc_AtomicInteger.h
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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file parc_AtomicInteger.h
+ * @ingroup threading
+ * @brief An integer value that may be updated automatically.
+ *
+ */
+#ifndef libparc_parc_AtomicInteger_h
+#define libparc_parc_AtomicInteger_h
+
+#include <stdint.h>
+
+/*
+ * If we are compiling with GCC or Clang, then
+ * we have some compiler extensions to make use of processer
+ * compare-and-swap and other kinds of synchronisation primitives.
+ */
+#if defined(__GNUC__) || defined(__clang__)
+# define USE_GCC_EXTENSIONS 1
+#endif
+
+// Turn this off until the problem on the SMP machines is worked out, case 787.
+#undef USE_GCC_EXTENSIONS
+
+#ifdef USE_GCC_EXTENSIONS
+uint32_t parcAtomicInteger_Uint32IncrementGCC(uint32_t *value);
+
+uint32_t parcAtomicInteger_Uint32DecrementGCC(uint32_t *value);
+
+uint64_t parcAtomicInteger_Uint64IncrementGCC(uint64_t *value);
+
+uint64_t parcAtomicInteger_Uint64DecrementGCC(uint64_t *value);
+
+#define parcAtomicInteger_Uint32Increment parcAtomicInteger_Uint32IncrementGCC
+
+#define parcAtomicInteger_Uint32Decrement parcAtomicInteger_Uint32DecrementGCC
+
+#define parcAtomicInteger_Uint64Increment parcAtomicInteger_Uint64IncrementGCC
+
+#define parcAtomicInteger_Uint64Decrement parcAtomicInteger_Uint64DecrementGCC
+
+#else
+uint32_t parcAtomicInteger_Uint32IncrementPthread(uint32_t *value);
+
+uint32_t parcAtomicInteger_Uint32DecrementPthread(uint32_t *value);
+
+uint64_t parcAtomicInteger_Uint64IncrementPthread(uint64_t *value);
+
+uint64_t parcAtomicInteger_Uint64DecrementPthread(uint64_t *value);
+
+#define parcAtomicInteger_Uint32Increment parcAtomicInteger_Uint32IncrementPthread
+
+#define parcAtomicInteger_Uint32Decrement parcAtomicInteger_Uint32DecrementPthread
+
+#define parcAtomicInteger_Uint64Increment parcAtomicInteger_Uint64IncrementPthread
+
+#define parcAtomicInteger_Uint64Decrement parcAtomicInteger_Uint64DecrementPthread
+#endif
+#endif // libparc_parc_AtomicInteger_h