diff --git a/configure/CONFIG.gnuCommon b/configure/CONFIG.gnuCommon
index f0548024e..94d1286e0 100644
--- a/configure/CONFIG.gnuCommon
+++ b/configure/CONFIG.gnuCommon
@@ -12,6 +12,8 @@
 
 GNU = YES
 
+CMPLR_CLASS = gcc
+
 GNU_BIN = $(GNU_DIR)/bin
 GNU_LIB = $(GNU_DIR)/lib
 
diff --git a/configure/CONFIG_COMMON b/configure/CONFIG_COMMON
index d1e19ba01..a1ba1861e 100644
--- a/configure/CONFIG_COMMON
+++ b/configure/CONFIG_COMMON
@@ -133,11 +133,14 @@ POSIX_YES = os/posix
 GENERIC_SRC_DIRS = .. $(SRC_DIRS)
 OS_SRC_DIRS += . $(foreach dir, .. $(SRC_DIRS), \
        $(addprefix $(dir)/, os/$(OS_CLASS) $(POSIX_$(POSIX)) os/default ))
-ALL_SRC_DIRS = $(OS_SRC_DIRS) $(GENERIC_SRC_DIRS)
+CMPLR_SRC_DIRS += . $(foreach dir, .. $(SRC_DIRS), \
+       $(addprefix $(dir)/, compiler/$(CMPLR_CLASS) compiler/default ))
+ALL_SRC_DIRS = $(CMPLR_SRC_DIRS) $(OS_SRC_DIRS) $(GENERIC_SRC_DIRS)
 
 #--------------------------------------------------
 # compile line include directories
 INSTALL_INCLUDES += \
+       -I$(INSTALL_INCLUDE)/compiler/$(CMPLR_CLASS) \
        -I$(INSTALL_INCLUDE)/os/$(OS_CLASS) \
        -I$(INSTALL_INCLUDE)
 SRC_INCLUDES = -I$(COMMON_DIR) $(addprefix -I, $(wildcard $(ALL_SRC_DIRS)))
@@ -379,24 +382,35 @@ INSTALL_PERMISSIONS = 444
 #
 # auto determine the directory paths that things are installed to
 # RULES:
-# 1) found in any one of several os specific area
+# 0) found in any one of several compiler specific paths
+#       => install to $(INSTALL_INCLUDE)/compiler/$(CMPLR_CLASS)
+# 1) not found in (0) and found in any one of several OS specific paths
 #       => install to $(INSTALL_INCLUDE)/os/$(OS_CLASS)
-# 2) not foundin (1) and found in generic area
+# 2) not found in (1) and found in generic paths
 #       => install to $(INSTALL_INCLUDE)
 # 3) not found in (1) or (2) then may be (not yet) computer generated
 #       => install into $(INSTALL_INCLUDE)/os/$(OS_CLASS) and let
 #       build rules work on vpath
 #
 # These rules guarantee that the users include from
-# no more than two directories
+# no more than three directories
 #
 INSTALL_INC += $(foreach inc, $(INC), \
     $(firstword \
+        $(CMPLR_INSTALL_INC) \
         $(OS_INSTALL_INC) \
         $(GENERIC_INSTALL_INC) \
         $(GENERATED_INSTALL_INC) ) )
 INSTALL_INC += $(addprefix $(INSTALL_INCLUDE)/os/$(OS_CLASS)/, $(INC_$(OS_CLASS)) )
 
+#
+# Rule 0
+#
+CMPLR_INSTALL_INC = $(addprefix $(INSTALL_INCLUDE)/compiler/$(CMPLR_CLASS)/, $(INSTALL_INC_jjj) )
+INSTALL_INC_jjj = $(foreach dir, $(CMPLR_SRC_DIRS), $(INSTALL_INC_iii)  )
+INSTALL_INC_iii = $(subst $(dir)/, , $(INSTALL_INC_hhh) )
+INSTALL_INC_hhh = $(wildcard $(addsuffix /$(inc), $(dir)) )
+
 #
 # Rule 1
 #
diff --git a/configure/RULES_BUILD b/configure/RULES_BUILD
index 94ddd8a47..5e1f4ce1f 100644
--- a/configure/RULES_BUILD
+++ b/configure/RULES_BUILD
@@ -408,7 +408,11 @@ $(INSTALL_INCLUDE)/% : %
 	@$(INSTALL) -d -m $(INSTALL_PERMISSIONS) $< $(@D)
 
 $(INSTALL_INCLUDE)/os/$(OS_CLASS)/% : %
-	$(ECHO) "Installing os dependent include file $@"
+	$(ECHO) "Installing OS dependent include file $@"
+	@$(INSTALL) -d -m $(INSTALL_PERMISSIONS) $< $(@D)
+	
+$(INSTALL_INCLUDE)/compiler/$(CMPLR_CLASS)/% : %
+	$(ECHO) "Installing compiler dependent include file $@"
 	@$(INSTALL) -d -m $(INSTALL_PERMISSIONS) $< $(@D)
 
 $(INSTALL_DOC)/%: %
diff --git a/configure/os/CONFIG.solarisCommon.solarisCommon b/configure/os/CONFIG.solarisCommon.solarisCommon
index c38fc92d8..117957575 100644
--- a/configure/os/CONFIG.solarisCommon.solarisCommon
+++ b/configure/os/CONFIG.solarisCommon.solarisCommon
@@ -7,6 +7,8 @@
 # Sites may override these definitions in CONFIG_SITE.solaris-sparc.solaris-sparc
 #-------------------------------------------------------
 
+CMPLR_CLASS = solStudio
+
 SPARCWORKS = /opt/SUNWspro
 GNU = NO
 
diff --git a/configure/os/CONFIG.win32-x86-borland.win32-x86-borland b/configure/os/CONFIG.win32-x86-borland.win32-x86-borland
index 8e7845192..26235c3bd 100644
--- a/configure/os/CONFIG.win32-x86-borland.win32-x86-borland
+++ b/configure/os/CONFIG.win32-x86-borland.win32-x86-borland
@@ -7,6 +7,8 @@
 # Sites may override these definitions in CONFIG_SITE.win32-x86-borland.win32-x86-borland
 #-------------------------------------------------------
 
+CMPLR_CLASS = borland
+
 # Win32 valid build types and include directory suffixes
 
 VALID_BUILDS = Host Ioc
diff --git a/configure/os/CONFIG.win32-x86.win32-x86 b/configure/os/CONFIG.win32-x86.win32-x86
index 207f4c7bf..86b9510ac 100644
--- a/configure/os/CONFIG.win32-x86.win32-x86
+++ b/configure/os/CONFIG.win32-x86.win32-x86
@@ -11,6 +11,8 @@
 
 VALID_BUILDS = Host Ioc
 
+CMPLR_CLASS = msvc
+
 # convert UNIX path to native path
 PATH_FILTER = $(subst /,\\,$(1))
 
diff --git a/configure/os/CONFIG_SITE.Common.darwin-x86 b/configure/os/CONFIG_SITE.Common.darwin-x86
index 7aad1537e..dc0e0206a 100644
--- a/configure/os/CONFIG_SITE.Common.darwin-x86
+++ b/configure/os/CONFIG_SITE.Common.darwin-x86
@@ -14,10 +14,9 @@ ARCH_CLASS = i386
 #ARCH_CLASS = x86_64
 #ARCH_CLASS = i386 x86_64
 
-#
 # Uncomment the followings lines to build with CLANG instead of GCC.
 #
-#CC             = clang
-#CCC            = clang++
-#GNU_LDLIBS_YES =
-
+#GNU         = NO
+#CMPLR_CLASS = clang
+#CC          = clang
+#CCC         = clang++
diff --git a/configure/os/CONFIG_SITE.Common.linux-x86 b/configure/os/CONFIG_SITE.Common.linux-x86
index c887ff74f..6760e2309 100644
--- a/configure/os/CONFIG_SITE.Common.linux-x86
+++ b/configure/os/CONFIG_SITE.Common.linux-x86
@@ -34,9 +34,9 @@ COMMANDLINE_LIBRARY = READLINE
 
 OP_SYS_CFLAGS += -g
 
-# Some Linux distributions provide clang as an alternative to GCC.
-# To use clang if you have it, uncomment these three lines:
-#CC             = clang
-#CCC            = clang++
-#GNU_LDLIBS_YES =
-
+# Uncomment the followings lines to build with CLANG instead of GCC.
+#
+#GNU         = NO
+#CMPLR_CLASS = clang
+#CC          = clang
+#CCC         = clang++
diff --git a/configure/os/CONFIG_SITE.Common.linux-x86_64 b/configure/os/CONFIG_SITE.Common.linux-x86_64
index 2894c3926..8095c9f2a 100644
--- a/configure/os/CONFIG_SITE.Common.linux-x86_64
+++ b/configure/os/CONFIG_SITE.Common.linux-x86_64
@@ -34,9 +34,9 @@ COMMANDLINE_LIBRARY = READLINE
 
 OP_SYS_CFLAGS += -g
 
-# Some Linux distributions provide clang as an alternative to GCC.
-# To use clang if you have it, uncomment these three lines:
-#CC             = clang
-#CCC            = clang++
-#GNU_LDLIBS_YES =
-
+# Uncomment the followings lines to build with CLANG instead of GCC.
+#
+#GNU         = NO
+#CMPLR_CLASS = clang
+#CC          = clang
+#CCC         = clang++
diff --git a/src/libCom/misc/compilerDependencies.h b/src/libCom/misc/compilerDependencies.h
deleted file mode 100644
index 4c2a8400f..000000000
--- a/src/libCom/misc/compilerDependencies.h
+++ /dev/null
@@ -1,104 +0,0 @@
-
-/*************************************************************************\
-* Copyright (c) 2008 UChicago Argonne LLC, as Operator of Argonne
-*     National Laboratory.
-* Copyright (c) 2002 The Regents of the University of California, as
-*     Operator of Los Alamos National Laboratory.
-* EPICS BASE is distributed subject to a Software License Agreement found
-* in file LICENSE that is included with this distribution. 
-\*************************************************************************/
-
-/*
- * Author: 
- * Jeffrey O. Hill
- * johill@lanl.gov
- */
-
-#ifndef compilerDependencies_h
-#define compilerDependencies_h
-
-/*
- * This is an attempt to move all tests identifying what features a 
- * compiler supports into one file.
- *
- * Since this is a compiler, and not os dependent, issue then ifdefs 
- * are used. The ifdefs allow us to make the default assumption that 
- * standards incompliance issues will be fixed by future compiler 
- * releases.
- */
-
-#ifdef __cplusplus
-
-/*
- * CXX_PLACEMENT_DELETE - defined if compiler supports placement delete
- * CXX_THROW_SPECIFICATION - defined if compiler supports throw specification
- */
-
-#if defined ( _MSC_VER )
-#   if _MSC_VER >= 1200  /* visual studio 6.0 or later */
-#       define CXX_PLACEMENT_DELETE
-#   endif
-#   if _MSC_VER > 1300  /* some release after visual studio 7 we hope */
-#       define CXX_THROW_SPECIFICATION
-#   endif
-#elif defined ( __HP_aCC ) 
-#   if _HP_aCC > 33300
-#       define CXX_PLACEMENT_DELETE
-#   endif
-#   define CXX_THROW_SPECIFICATION
-#elif defined ( __BORLANDC__ ) 
-#   if __BORLANDC__ >= 0x600
-#       define CXX_PLACEMENT_DELETE
-#   endif
-#   define CXX_THROW_SPECIFICATION
-#elif defined ( __GNUC__ ) 
-#   if __GNUC__ > 2 || ( __GNUC__ == 2 && __GNUC_MINOR__ >= 95 )
-#       define CXX_THROW_SPECIFICATION
-#   endif
-#   if __GNUC__ > 2 || ( __GNUC__ == 2 && __GNUC_MINOR__ >= 96 )
-#       define CXX_PLACEMENT_DELETE
-#   endif
-#else
-#   define CXX_PLACEMENT_DELETE
-#   define CXX_THROW_SPECIFICATION
-#endif
-
-/*
- * usage: void func () epicsThrows (( std::bad_alloc, std::logic_error ))
- */
-#if defined ( CXX_THROW_SPECIFICATION )
-#   define epicsThrows(X) throw X
-#else
-#   define epicsThrows(X)
-#endif
-
-/*
- * usage: epicsPlacementDeleteOperator (( void *, myMemoryManager & ))
- */
-#if defined ( CXX_PLACEMENT_DELETE )
-#   define epicsPlacementDeleteOperator(X) void operator delete X;
-#else
-#   define epicsPlacementDeleteOperator(X)
-#endif
-
-#endif /* __cplusplus */
-
-/*
- * Enable format-string checking if possible
- */
-#ifdef __GNUC__
-# define EPICS_PRINTF_STYLE(f,a) __attribute__((format(__printf__,f,a)))
-#else
-# define EPICS_PRINTF_STYLE(f,a)
-#endif
-
-/*
- * Deprecation marker
- */
-#if defined( __GNUC__ ) && (__GNUC__ > 2)
-# define EPICS_DEPRECATED __attribute__((deprecated))
-#else
-# define EPICS_DEPRECATED
-#endif
-
-#endif  /* ifndef compilerDependencies_h */
diff --git a/src/libCom/osi/Makefile b/src/libCom/osi/Makefile
index 208ec6a3a..1f0ca4cdf 100644
--- a/src/libCom/osi/Makefile
+++ b/src/libCom/osi/Makefile
@@ -8,6 +8,10 @@
 # This is a Makefile fragment, see src/libCom/Makefile.
 
 SRC_DIRS += $(LIBCOM)/osi
+
+INC += compilerDependencies.h
+INC += compilerSpecific.h
+
 INC += osiFileName.h
 INC += osiSock.h
 INC += osdSock.h
diff --git a/src/libCom/osi/compiler/borland/compilerSpecific.h b/src/libCom/osi/compiler/borland/compilerSpecific.h
new file mode 100644
index 000000000..9251bfe29
--- /dev/null
+++ b/src/libCom/osi/compiler/borland/compilerSpecific.h
@@ -0,0 +1,45 @@
+/*************************************************************************\
+* Copyright (c) 2008 UChicago Argonne LLC, as Operator of Argonne
+*     National Laboratory.
+* Copyright (c) 2002 The Regents of the University of California, as
+*     Operator of Los Alamos National Laboratory.
+* EPICS BASE is distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution. 
+\*************************************************************************/
+
+/*
+ * Author: 
+ * Jeffrey O. Hill
+ * johill@lanl.gov
+ */
+
+#ifndef compilerSpecific_h
+#define compilerSpecific_h
+ 
+#ifndef __BORLANDC__
+#   error compiler/borland/compilerSpecific.h is only for use with the Borland compiler
+#endif
+
+#ifdef __cplusplus
+
+/*
+ * in general we dont like ifdefs but they do allow us to check the
+ * compiler version and make the optimistic assumption that 
+ * standards incompliance issues will be fixed by future compiler 
+ * releases
+ */
+ 
+/*
+ * CXX_PLACEMENT_DELETE - defined if compiler supports placement delete
+ * CXX_THROW_SPECIFICATION - defined if compiler supports throw specification
+ */
+#if __BORLANDC__ >= 0x600
+#    define CXX_PLACEMENT_DELETE
+#endif
+
+#define CXX_THROW_SPECIFICATION
+
+#endif /* __cplusplus */
+
+
+#endif  /* ifndef compilerSpecific_h */
diff --git a/src/libCom/osi/compiler/clang/compilerSpecific.h b/src/libCom/osi/compiler/clang/compilerSpecific.h
new file mode 100644
index 000000000..9c6b237c5
--- /dev/null
+++ b/src/libCom/osi/compiler/clang/compilerSpecific.h
@@ -0,0 +1,49 @@
+/*************************************************************************\
+* Copyright (c) 2008 UChicago Argonne LLC, as Operator of Argonne
+*     National Laboratory.
+* Copyright (c) 2002 The Regents of the University of California, as
+*     Operator of Los Alamos National Laboratory.
+* EPICS BASE is distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution. 
+\*************************************************************************/
+
+/*
+ * Author: 
+ * Jeffrey O. Hill
+ * johill@lanl.gov
+ */
+
+#ifndef compilerSpecific_h
+#define compilerSpecific_h
+ 
+#ifndef __clang__
+#   error compiler/clang/compilerSpecific.h is only for use with the clang compiler
+#endif
+
+#ifdef __cplusplus
+
+/*
+ * CXX_PLACEMENT_DELETE - defined if compiler supports placement delete
+ * CXX_THROW_SPECIFICATION - defined if compiler supports throw specification
+ */
+#define CXX_PLACEMENT_DELETE
+#define CXX_THROW_SPECIFICATION
+
+#endif /* __cplusplus */
+
+/*
+ * __has_attribute() is not supported on all versions of clang yet
+ */
+
+/*
+ * Enable format-string checking
+ */
+#define EPICS_PRINTF_STYLE(f,a) __attribute__((format(__printf__,f,a)))
+
+/*
+ * Deprecation marker
+ */
+#define EPICS_DEPRECATED __attribute__((deprecated))
+
+
+#endif  /* ifndef compilerSpecific_h */
diff --git a/src/libCom/osi/compiler/default/compilerSpecific.h b/src/libCom/osi/compiler/default/compilerSpecific.h
new file mode 100644
index 000000000..f2a3f8c36
--- /dev/null
+++ b/src/libCom/osi/compiler/default/compilerSpecific.h
@@ -0,0 +1,33 @@
+/*************************************************************************\
+* Copyright (c) 2008 UChicago Argonne LLC, as Operator of Argonne
+*     National Laboratory.
+* Copyright (c) 2002 The Regents of the University of California, as
+*     Operator of Los Alamos National Laboratory.
+* EPICS BASE is distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution. 
+\*************************************************************************/
+
+/*
+ * Author: 
+ * Jeffrey O. Hill
+ * johill@lanl.gov
+ */
+
+#ifndef compilerSpecific_h
+#define compilerSpecific_h
+ 
+#ifdef __cplusplus
+
+/*
+ * CXX_PLACEMENT_DELETE - defined if compiler supports placement delete
+ * CXX_THROW_SPECIFICATION - defined if compiler supports throw specification
+ *
+ * (our default guess is that the compiler implements the C++ 97 standard)
+ */
+#define CXX_THROW_SPECIFICATION
+#define CXX_PLACEMENT_DELETE
+
+#endif /* __cplusplus */
+
+
+#endif  /* ifndef compilerSpecific_h */
diff --git a/src/libCom/osi/compiler/gcc/compilerSpecific.h b/src/libCom/osi/compiler/gcc/compilerSpecific.h
new file mode 100644
index 000000000..efd17e4b2
--- /dev/null
+++ b/src/libCom/osi/compiler/gcc/compilerSpecific.h
@@ -0,0 +1,64 @@
+/*************************************************************************\
+* Copyright (c) 2008 UChicago Argonne LLC, as Operator of Argonne
+*     National Laboratory.
+* Copyright (c) 2002 The Regents of the University of California, as
+*     Operator of Los Alamos National Laboratory.
+* EPICS BASE is distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution. 
+\*************************************************************************/
+
+/*
+ * Author: 
+ * Jeffrey O. Hill
+ * johill@lanl.gov
+ */
+
+#ifndef compilerSpecific_h
+#define compilerSpecific_h
+
+#ifndef __GNUC__
+#   error compiler/gcc/compilerSpecific.h is only for use with the gnu compiler
+#endif
+
+#ifdef __clang__
+#   error compiler/gcc/compilerSpecific.h is not for use with the clang compiler
+#endif
+ 
+#ifdef __cplusplus
+
+/*
+ * in general we dont like ifdefs but they do allow us to check the
+ * compiler version and make the optimistic assumption that 
+ * standards incompliance issues will be fixed by future compiler 
+ * releases
+ */
+
+/*
+ * CXX_PLACEMENT_DELETE - defined if compiler supports placement delete
+ * CXX_THROW_SPECIFICATION - defined if compiler supports throw specification
+ */
+
+#if __GNUC__ > 2 || ( __GNUC__ == 2 && __GNUC_MINOR__ >= 95 )
+#   define CXX_THROW_SPECIFICATION
+#endif
+
+#if __GNUC__ > 2 || ( __GNUC__ == 2 && __GNUC_MINOR__ >= 96 )
+#   define CXX_PLACEMENT_DELETE
+#endif
+
+#endif /* __cplusplus */
+
+/*
+ * Enable format-string checking if possible
+ */
+#define EPICS_PRINTF_STYLE(f,a) __attribute__((format(__printf__,f,a)))
+
+/*
+ * Deprecation marker if possible
+ */
+#if  (__GNUC__ > 2)
+#   define EPICS_DEPRECATED __attribute__((deprecated))
+#endif
+
+
+#endif  /* ifndef compilerSpecific_h */
diff --git a/src/libCom/osi/compiler/msvc/compilerSpecific.h b/src/libCom/osi/compiler/msvc/compilerSpecific.h
new file mode 100644
index 000000000..587d534c7
--- /dev/null
+++ b/src/libCom/osi/compiler/msvc/compilerSpecific.h
@@ -0,0 +1,47 @@
+/*************************************************************************\
+* Copyright (c) 2008 UChicago Argonne LLC, as Operator of Argonne
+*     National Laboratory.
+* Copyright (c) 2002 The Regents of the University of California, as
+*     Operator of Los Alamos National Laboratory.
+* EPICS BASE is distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution. 
+\*************************************************************************/
+
+/*
+ * Author: 
+ * Jeffrey O. Hill
+ * johill@lanl.gov
+ */
+
+#ifndef compilerSpecific_h
+#define compilerSpecific_h
+ 
+#ifndef _MSC_VER
+#   error compiler/msvc/compilerSpecific.h is only for use with the Microsoft compiler
+#endif
+
+#ifdef __cplusplus
+
+/*
+ * in general we dont like ifdefs but they do allow us to check the
+ * compiler version and make the optimistic assumption that 
+ * standards incompliance issues will be fixed by future compiler 
+ * releases
+ */
+ 
+/*
+ * CXX_PLACEMENT_DELETE - defined if compiler supports placement delete
+ * CXX_THROW_SPECIFICATION - defined if compiler supports throw specification
+ */
+#if _MSC_VER >= 1200  /* visual studio 6.0 or later */
+#    define CXX_PLACEMENT_DELETE
+#endif
+
+#if _MSC_VER > 1300  /* some release after visual studio 7 we hope */
+#    define CXX_THROW_SPECIFICATION
+#endif
+
+#endif /* __cplusplus */
+
+
+#endif  /* ifndef compilerSpecific_h */
diff --git a/src/libCom/osi/compilerDependencies.h b/src/libCom/osi/compilerDependencies.h
new file mode 100644
index 000000000..c91133996
--- /dev/null
+++ b/src/libCom/osi/compilerDependencies.h
@@ -0,0 +1,62 @@
+/*************************************************************************\
+* Copyright (c) 2008 UChicago Argonne LLC, as Operator of Argonne
+*     National Laboratory.
+* Copyright (c) 2002 The Regents of the University of California, as
+*     Operator of Los Alamos National Laboratory.
+* EPICS BASE is distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution. 
+\*************************************************************************/
+
+/*
+ * Author: 
+ * Jeffrey O. Hill
+ * johill@lanl.gov
+ */
+
+#ifndef compilerDependencies_h
+#define compilerDependencies_h
+
+#include "compilerSpecific.h"
+
+#ifdef __cplusplus
+
+/*
+ * usage: void func () epicsThrows (( std::bad_alloc, std::logic_error ))
+ *
+ * Note: now a widely accepted concensus (ref Meyers and C++ faq) is that 
+ * one should avoid using throw specifications in C++ code
+ */
+#if defined ( CXX_THROW_SPECIFICATION )
+#   define epicsThrows(X) throw X
+#else
+#   define epicsThrows(X)
+#endif
+
+/*
+ * usage: epicsPlacementDeleteOperator (( void *, myMemoryManager & ))
+ */
+#if defined ( CXX_PLACEMENT_DELETE )
+#   define epicsPlacementDeleteOperator(X) void operator delete X;
+#else
+#   define epicsPlacementDeleteOperator(X)
+#endif
+
+#endif /* __cplusplus */
+
+
+#ifndef EPICS_PRINTF_STYLE
+/*
+ * No format-string checking
+ */
+#   define EPICS_PRINTF_STYLE(f,a)
+#endif
+
+#ifndef EPICS_DEPRECATED
+/*
+ * No deprecation markers
+ */
+#define EPICS_DEPRECATED
+#endif
+
+
+#endif  /* ifndef compilerDependencies_h */