diff --git a/configure/CONFIG_COMMON b/configure/CONFIG_COMMON
index 5fc60cc65..1659bc27e 100644
--- a/configure/CONFIG_COMMON
+++ b/configure/CONFIG_COMMON
@@ -30,7 +30,7 @@ DIVIDER = .
 CROSS1 = $(CROSS_COMPILER_TARGET_ARCHS$(word 1,$(CROSS_COMPILER_HOST_ARCHS)))
 
 # CROSS2 will be defined only when CROSS_COMPILER_HOST_ARCHS is defined
-# and EPICS_HOST_ARCH is one of it's words
+# and EPICS_HOST_ARCH is one of its words
 CROSS2 = $(CROSS_COMPILER_TARGET_ARCHS$(filter-out 1,$(words $(filter $(EPICS_HOST_ARCH),$(CROSS_COMPILER_HOST_ARCHS)))))
 
 BUILD_ARCHS = $(EPICS_HOST_ARCH) $(CROSS1) $(CROSS2)
@@ -272,11 +272,11 @@ INCLUDES = -I. $(SRC_INCLUDES) $(INSTALL_INCLUDES) $(RELEASE_INCLUDES)\
 
 CFLAGS = $($(BUILD_CLASS)_CFLAGS) $(POSIX_CFLAGS) $(OPT_CFLAGS) $(DEBUG_CFLAGS)\
  $(PIPE_CFLAGS) $(WARN_CFLAGS) $(TARGET_CFLAGS) $(USR_CFLAGS) $(ARCH_DEP_CFLAGS)\
- $(CODE_CFLAGS) $(STATIC_CFLAGS) $(OP_SYS_CFLAGS) $(LIBRARY_SRC_CFLAGS) $(HDEPENDS_CFLAGS)
+ $(CODE_CFLAGS) $(STATIC_CFLAGS) $(OP_SYS_CFLAGS) $(LIBRARY_SRC_CFLAGS)
 
 CXXFLAGS = $($(BUILD_CLASS)_CXXFLAGS) $(POSIX_CXXFLAGS) $(OPT_CXXFLAGS) $(DEBUG_CXXFLAGS)\
  $(PIPE_CFLAGS) $(WARN_CXXFLAGS) $(TARGET_CXXFLAGS) $(USR_CXXFLAGS) $(ARCH_DEP_CXXFLAGS)\
- $(CODE_CXXFLAGS) $(STATIC_CXXCFLAGS) $(OP_SYS_CXXFLAGS) $(LIBRARY_SRC_CFLAGS) $(HDEPENDS_CFLAGS)
+ $(CODE_CXXFLAGS) $(STATIC_CXXCFLAGS) $(OP_SYS_CXXFLAGS) $(LIBRARY_SRC_CFLAGS)
 
 LDFLAGS = $(OPT_LDFLAGS) $(TARGET_LDFLAGS) $(USR_LDFLAGS) $(POSIX_LDFLAGS) \
  $(ARCH_DEP_LDFLAGS) $(DEBUG_LDFLAGS) $(OP_SYS_LDFLAGS) $($(BUILD_CLASS)_LDFLAGS)\
@@ -326,15 +326,16 @@ HDEPENDS_METHOD = CMD
 
 HDEPENDS_INCLUDES = $(subst -I,,$(INCLUDES))
 HDEPENDSFLAGS = -m $*$(DEP) $(HDEPENDS_INCLUDES) $@ $<
-HDEPENDSCMD = -$(MKMF) $(HDEPENDS_FLAGS) $(HDEPENDSFLAGS)
 
 HDEPENDS_CMD_NO = $(ECHO) ""
-HDEPENDS_CMD_YES = $(if $(filter CMD,$(HDEPENDS_METHOD)),$(HDEPENDSCMD),$(HDEPENDS_CMD_NO))
-HDEPENDS_CMD = $(HDEPENDS_CMD_$(HDEPENDS))
+HDEPENDS_CMD_YES = $(MKMF) $(HDEPENDS_FLAGS) $(HDEPENDSFLAGS)
 
-HDEPENDSCFLAGS = -MMD
-HDEPENDS_CFLAGS_YES = $(if $(filter CFLAGS,$(HDEPENDS_METHOD)),$(HDEPENDSCFLAGS))
-HDEPENDS_CFLAGS = $(HDEPENDS_CFLAGS_$(HDEPENDS))
+HDEPENDSCFLAGS = -MM > $*$(DEP)
+HDEPSUFFIX = $(if $(filter .c,$(suffix $<)),.c,.cpp)
+HDEPENDS_CFLAGS_NO = $(ECHO) ""
+HDEPENDS_CFLAGS_YES = $(COMPILE$(HDEPSUFFIX)) $(HDEPENDSCFLAGS) $<
+
+HDEPENDS_CMD = $(HDEPENDS_$(HDEPENDS_METHOD)_$(HDEPENDS))
 
 #--------------------------------------------------
 # depends definition
@@ -342,7 +343,7 @@ HDEPENDS_CFLAGS = $(HDEPENDS_CFLAGS_$(HDEPENDS))
 TARGET_SRCS = $(foreach name, $(TESTPROD) $(PROD) $(TESTLIBRARY) $(LIBRARY) $(LOADABLE_LIBRARY), $($(name)_SRCS))
 SRC_FILES = $(LIB_SRCS) $(LIBSRCS) $(SRCS) $(USR_SRCS) $(PROD_SRCS) $(TARGET_SRCS)
 HDEPENDS_FILES_YES = $(addsuffix $(DEP),$(notdir $(basename $(SRC_FILES))))
-HDEPENDS_FILES = $(if $(filter NO,$(HDEPENDS)),,$(HDEPENDS_FILES_YES))
+HDEPENDS_FILES = $(HDEPENDS_FILES_$(HDEPENDS))
 
 #---------------------------------------------------------------
 # Names of installed items
diff --git a/configure/RULES.Db b/configure/RULES.Db
index d63ca9f1a..19b2df211 100644
--- a/configure/RULES.Db
+++ b/configure/RULES.Db
@@ -90,6 +90,8 @@ endif
 INSTALL_DB_INSTALLS = $(addprefix $(INSTALL_DB)/,$(notdir $(DB_INSTALLS)))
 INSTALL_DBD_INSTALLS = $(addprefix $(INSTALL_DBD)/,$(notdir $(DBD_INSTALLS)))
 
+COMMONDEP_TARGET = $(COMMON_DIR)/$(basename $@)
+
 #####################################################  acf files
 # An access security configuration file, *.acf, can be created from
 # an *.acs file (has format of acf file plus #include "filename" lines)
@@ -100,7 +102,7 @@ ACF_CPPFLAGS = $(ACF_CPPFLAGS_$(GNU))
 
 ACF_INCLUDES = -I. $(TARGET_INCLUDES) $(USR_INCLUDES)\
                 $(SRC_INCLUDES) -I$(INSTALL_DB)
-ACFDEPENDS_CMD = -$(MKMF) -m $(notdir $@)$(DEP) $(subst -I,,$(ACF_INCLUDES)) $@ $<
+ACFDEPENDS_CMD = $(MKMF) -m $@ $(subst -I,,$(ACF_INCLUDES)) $(COMMONDEP_TARGET) $<
 ACF_CMD = $(CPP) $(ACF_CPPFLAGS) $(ACF_INCLUDES) $< > $@
 
 #####################################################  dependancies
@@ -110,7 +112,8 @@ COMMON_DBDINC += $(addprefix $(COMMON_DIR)/,$(HINC))
 
 DBDDEPENDS_FILES += $(addsuffix $(DEP),$(HINC) \
                     $(patsubst $(COMMON_DIR)/%,%,$(COMMON_DBS)) \
-                    $(patsubst $(COMMON_DIR)/%,%,$(COMMON_DBDS)))
+                    $(patsubst $(COMMON_DIR)/%,%, \
+                    $(filter-out $(COMMON_DIR)/bpt%.dbd,$(COMMON_DBDS))))
 
 MAKEDBDEPENDS = $(PERL) $(TOOLS)/makeDbDepends.pl
 
@@ -159,8 +162,6 @@ ifneq (,$(strip $(DBDDEPENDS_FILES)))
 -include $(DBDDEPENDS_FILES)
 endif
 
-$(DBDDEPENDS_FILES):
-
 #####################################################  build dependancies, clean rule
 
 inc : $(COMMON_INC) $(INSTALL_INC)
@@ -181,6 +182,51 @@ db_clean :
 
 realclean: clean
 
+##################################################### Dependency files
+
+%Record.h$(DEP): $(COMMON_DIR)/%Record.dbd
+	@$(RM) $@
+	@$(DBTORECORDTYPEH) -D $(DBDFLAGS) -o $(COMMONDEP_TARGET) $< > $@
+	@echo "$(COMMONDEP_TARGET): ../Makefile" >> $@
+
+%Record.h$(DEP): %Record.dbd
+	@$(RM) $@
+	@$(DBTORECORDTYPEH) -D $(DBDFLAGS) -o $(COMMONDEP_TARGET) $< > $@
+	@echo "$(COMMONDEP_TARGET): ../Makefile" >> $@
+
+menu%.h$(DEP): $(COMMON_DIR)/menu%.dbd
+	@$(RM) $@
+	@$(DBTOMENUH) -D $(DBDFLAGS) -o $(COMMONDEP_TARGET) $< > $@
+	@echo "$(COMMONDEP_TARGET): ../Makefile" >> $@
+
+menu%.h$(DEP): menu%.dbd
+	@$(RM) $@
+	@$(DBTOMENUH) -D $(DBDFLAGS) -o $(COMMONDEP_TARGET) $< > $@
+	@echo "$(COMMONDEP_TARGET): ../Makefile" >> $@
+
+%.dbd$(DEP): $(COMMON_DIR)/%Include.dbd 
+	@$(RM) $@
+	@$(DBEXPAND) -D $(DBDFLAGS) -o $(COMMONDEP_TARGET) $< > $@
+	@echo "$(COMMONDEP_TARGET): ../Makefile" >> $@
+
+%.dbd$(DEP): %Include.dbd
+	@$(RM) $@
+	@$(DBEXPAND) -D $(DBDFLAGS) -o $(COMMONDEP_TARGET) $< > $@
+	@echo "$(COMMONDEP_TARGET): ../Makefile" >> $@
+
+%.db$(RAW)$(DEP): %.substitutions
+	@$(RM) $@
+	$(MAKEDBDEPENDS) $(COMMONDEP_TARGET) $< $(TEMPLATE_FILENAME) > $@
+	@echo "$(COMMONDEP_TARGET): $(TEMPLATE_FILENAME)" >> $@
+
+%.db$(RAW)$(DEP): %.template
+	@$(RM) $@
+	@$(MAKEDBDEPENDS) $(COMMONDEP_TARGET) $< > $@
+
+%.acf$(DEP): %.acs
+	@$(RM) $@
+	@$(ACFDEPENDS_CMD)
+
 ##################################################### CapFast filter
 
 $(COMMON_DIR)/%.edf: ../%.sch $(DEPSCHS) 
@@ -222,33 +268,21 @@ $(INSTALL_DB)/%.template: %.template
 ##################################################### INC files
 
 $(COMMON_DIR)/%Record.h: $(COMMON_DIR)/%Record.dbd
-	@$(RM) $(notdir $@)$(DEP)
-	@$(DBTORECORDTYPEH) -D $(DBDFLAGS) -o $@ $< > $(notdir $@)$(DEP)
-	@echo "$@: ../Makefile" >> $(notdir $@)$(DEP)
 	@$(RM) $(notdir $@)
 	$(DBTORECORDTYPEH) $(DBDFLAGS) -o $(notdir $@) $<
 	@$(MV) $(notdir $@) $@
 
 $(COMMON_DIR)/%Record.h: %Record.dbd
-	@$(RM) $(notdir $@)$(DEP)
-	@$(DBTORECORDTYPEH) -D $(DBDFLAGS) -o $@ $< > $(notdir $@)$(DEP)
-	@echo "$@: ../Makefile" >> $(notdir $@)$(DEP)
 	@$(RM) $(notdir $@)
 	$(DBTORECORDTYPEH) $(DBDFLAGS) -o $(notdir $@) $<
 	@$(MV) $(notdir $@) $@
 
 $(COMMON_DIR)/menu%.h: $(COMMON_DIR)/menu%.dbd
-	@$(RM) $(notdir $@)$(DEP)
-	@$(DBTOMENUH) -D $(DBDFLAGS) -o $@ $< > $(notdir $@)$(DEP)
-	@echo "$@: ../Makefile" >> $(notdir $@)$(DEP)
 	@$(RM) $(notdir $@)
 	$(DBTOMENUH) $(DBDFLAGS) -o $(notdir $@) $<
 	@$(MV) $(notdir $@) $@
 
 $(COMMON_DIR)/menu%.h: menu%.dbd
-	@$(RM) $(notdir $@)$(DEP)
-	@$(DBTOMENUH) -D $(DBDFLAGS) -o $@ $< > $(notdir $@)$(DEP)
-	@echo "$@: ../Makefile" >> $(notdir $@)$(DEP)
 	@$(RM) $(notdir $@)
 	$(DBTOMENUH) $(DBDFLAGS) -o $(notdir $@) $<
 	@$(MV) $(notdir $@) $@
@@ -258,23 +292,18 @@ $(COMMON_DIR)/menu%.h: menu%.dbd
 ##################################################### DBD files
 
 $(COMMON_DIR)/bpt%.dbd: bpt%.data 
+	@$(RM) $(notdir $@)
 	$(MAKEBPT) $< $(notdir $@)
 	@$(MV) $(notdir $@) $@
 
 $(COMMON_DIR)/%.dbd: $(COMMON_DIR)/%Include.dbd
-	@$(RM) $(notdir $@)$(DEP)
-	@$(DBEXPAND) -D $(DBDFLAGS) -o $@ $< > $(notdir $@)$(DEP)
-	@echo "$@: ../Makefile" >> $(notdir $@)$(DEP)
-	$(ECHO) "Expanding dbd"
+	$(ECHO) "Expanding created dbd file $(notdir $<)"
 	@$(RM) $(notdir $@)
-	@$(DBEXPAND) $(DBDFLAGS) -o $(notdir $@) $<
+	$(DBEXPAND) $(DBDFLAGS) -o $(notdir $@) $<
 	@$(MV) $(notdir $@) $@
 
 $(COMMON_DIR)/%.dbd: %Include.dbd 
-	@$(RM) $(notdir $@)$(DEP)
-	@$(DBEXPAND) -D $(DBDFLAGS) -o $@ $< > $(notdir $@)$(DEP)
-	@echo "$@: ../Makefile" >> $(notdir $@)$(DEP)
-	$(ECHO) "Expanding dbd"
+	$(ECHO) "Expanding dbd file $<"
 	@$(RM) $(notdir $@)
 	$(DBEXPAND) $(DBDFLAGS) -o $(notdir $@) $<
 	@$(MV) $(notdir $@) $@
@@ -309,25 +338,18 @@ $(COMMON_DIR)/%.db$(RAW): $(COMMON_DIR)/%.edf
 	@$(RM) $*.VAR
 
 $(COMMON_DIR)/%.db$(RAW): %.substitutions
-	@$(RM) $(notdir $@)$(DEP)
-	$(MAKEDBDEPENDS) $@ $< $(TEMPLATE_FILENAME) > $(notdir $@)$(DEP)
-	@echo "$@: $(TEMPLATE_FILENAME)" >> $(notdir $@)$(DEP)
 	$(ECHO) "Inflating database from $< $(TEMPLATE_FILENAME)"
 	@$(RM) $@ $*.tmp
 	$(MSI) $(DBFLAGS) -S$< $(TEMPLATE_FILENAME) > $*.tmp
 	$(MV) $*.tmp $@
 
 $(COMMON_DIR)/%.db$(RAW): %.template
-	@$(RM) $(notdir $@)$(DEP)
-	@$(MAKEDBDEPENDS) $@ $< > $(notdir $@)$(DEP)
 	$(ECHO) "Inflating database from $<"
 	@$(RM) $@ $*.tmp
 	$(MSI) $(DBFLAGS) $< > $*.tmp
 	$(MV) $*.tmp $@
 
 $(COMMON_DIR)/%.acf: %.acs
-	@$(RM) $(notdir $@)$(DEP)
-	@$(ACFDEPENDS_CMD)
 	$(ECHO) "Creating acf file $@"
 	@$(RM) $@
 	$(ACF_CMD)
@@ -385,6 +407,5 @@ IOC_INST_TOP := $(firstword $(IOCS_APPL_TOP) \
 	$(MV) $*.tmp $@
 
 .PRECIOUS: %_registerRecordDeviceDriver.cpp
-.PRECIOUS: %$(DEP)
 
 ##################################################### END OF FILE
diff --git a/configure/RULES_BUILD b/configure/RULES_BUILD
index 645709aae..50c7582b0 100644
--- a/configure/RULES_BUILD
+++ b/configure/RULES_BUILD
@@ -76,6 +76,7 @@ all:	install
 -include $(CONFIG)/RULES_JAVA
 
 ifneq (,$(strip $(HDEPENDS_FILES)))
+$(filter-out $(wildcard *$(DEP)), $(HDEPENDS_FILES)): $(COMMON_INC)
 -include $(HDEPENDS_FILES)
 endif
 
@@ -200,18 +201,27 @@ $(OBJLIBNAME):%$(OBJ):
 	@$(RM) $@
 	$(COMPILE.ctdt) $<
 
-%$(OBJ): %.c
+%$(DEP):%.c
+	@$(RM) $@
 	@$(HDEPENDS_CMD)
+
+%$(DEP):%.cc
+	@$(RM) $@
+	@$(HDEPENDS_CMD)
+
+%$(DEP):%.cpp
+	@$(RM) $@
+	@$(HDEPENDS_CMD)
+
+%$(OBJ): %.c
 	@$(RM) $@
 	$(COMPILE.c) $(call PATH_FILTER,$<) $(COMPILE_FILTER.c)
 
 %$(OBJ): %.cc
-	@$(HDEPENDS_CMD)
 	@$(RM) $@
 	$(COMPILE.cpp) $(call PATH_FILTER,$<) $(COMPILE_FILTER.cpp)
 
 %$(OBJ): %.cpp
-	@$(HDEPENDS_CMD)
 	@$(RM) $@
 	$(COMPILE.cpp) $(call PATH_FILTER,$<) $(COMPILE_FILTER.cpp)
 
diff --git a/configure/os/CONFIG.Common.RTEMS b/configure/os/CONFIG.Common.RTEMS
index faf2bd23c..10aaba80a 100644
--- a/configure/os/CONFIG.Common.RTEMS
+++ b/configure/os/CONFIG.Common.RTEMS
@@ -53,13 +53,12 @@ VALID_BUILDS = Ioc
 # through the following contortions to get the EPICS flags back.
 CFLAGS = $(CROSS_CFLAGS) $(OPT_CFLAGS) $(DEBUG_CFLAGS)\
  $(WARN_CFLAGS) $(TARGET_CFLAGS) $(USR_CFLAGS) $(ARCH_DEP_CFLAGS)\
- $(CODE_CFLAGS) $(STATIC_CFLAGS)  $(OP_SYS_CFLAGS) $(LIBRARY_SRC_CFLAGS)\
- $(HDEPENDS_CFLAGS)
+ $(CODE_CFLAGS) $(STATIC_CFLAGS)  $(OP_SYS_CFLAGS) $(LIBRARY_SRC_CFLAGS)
 
 CXXFLAGS = $(CROSS_CXXFLAGS) $(OPT_CXXFLAGS)\
  $(DEBUG_CXXFLAGS) $(WARN_CXXFLAGS) $(TARGET_CXXFLAGS) $(USR_CXXFLAGS)\
  $(ARCH_DEP_CXXFLAGS) $(CODE_CXXFLAGS) $(STATIC_CXXCFLAGS) $(OP_SYS_CXXFLAGS)\
- $(LIBRARY_SRC_CFLAGS) $(HDEPENDS_CFLAGS)
+ $(LIBRARY_SRC_CFLAGS)
 
 LDFLAGS = $(OPT_LDFLAGS) $(TARGET_LDFLAGS) $(USR_LDFLAGS) \
  $(ARCH_DEP_LDFLAGS) $(DEBUG_LDFLAGS) $(OP_SYS_LDFLAGS) $(CROSS_LDFLAGS)\
diff --git a/configure/os/CONFIG.solarisCommon.solarisCommon b/configure/os/CONFIG.solarisCommon.solarisCommon
index 117957575..e1b944b39 100644
--- a/configure/os/CONFIG.solarisCommon.solarisCommon
+++ b/configure/os/CONFIG.solarisCommon.solarisCommon
@@ -55,14 +55,9 @@ LOADABLE_SHRLIB_LDFLAGS = -G -h $@ -z text
 
 OP_SYS_LDFLAGS += -z ignore -z combreloc -z lazyload
 
-# Filter for getting rid of "invalid white space character in directive" compiler warnings
-# when including headers created during win32 build.
-#COMPILE_FILTER.c = 2>&1 | $(EPICS_BASE)/configure/tools/filterWarnings.pl
-#COMPILE_FILTER.cpp = $(COMPILE_FILTER.c)
-
 # Header dependency file generation command
-HDEPENDS_METHOD=CMD 
-HDEPENDSCMD = $(if $(filter .c,$(suffix $<)),$(COMPILE.c),$(COMPILE.cpp)) -xM1 $< >$*$(DEP)
+HDEPENDS_METHOD = CFLAGS
+HDEPENDSCFLAGS = -xM1 > $*$(DEP)
 
 #--------------------------------------------------
 # Allow site overrides
diff --git a/documentation/RELEASE_NOTES.html b/documentation/RELEASE_NOTES.html
index f5e120de5..e55b4692b 100644
--- a/documentation/RELEASE_NOTES.html
+++ b/documentation/RELEASE_NOTES.html
@@ -15,6 +15,36 @@ EPICS Base 3.15.0.x releases are not intended for use in production systems.</p>
 <h2 align="center">Changes between 3.14.x and 3.15.0.x</h2>
 <!-- Insert new items immediately below here ... -->
 
+
+<h4>Parallel Builds</h4>
+
+<p>
+As EPICS sites get computers with more CPUs they report additional bugs in our
+parallel build rules. Various issues have been fixed by separating out the build
+rules that generate dependency (.d) files, ensuring that they are constructed at
+the appropriate time in the build.</p>
+
+<p>
+These rule changes can cause additional warning messages to appear when building
+support modules. Where an application provides its own Makefile rules it may now
+have to add rules to construct an associated dependency file. In many cases
+though the change needed is just to replace a dependency for a
+<tt>target$(OBJ)</tt> with the <tt>target$(DEP)</tt> so this</p>
+
+<pre>
+    myLib$(OBJ): myLib_lex.c</pre>
+
+<p>
+becomes</p>
+
+<pre>
+    myLib$(DEP): myLib_lex.c</pre>
+
+<p>
+To debug build issues assocated with dependency files, use the command <tt>make
+--debug=m</tt> which tells GNUmake to display information about what it is doing
+during the first pass when it updates its makefiles.</p>
+
 <h3>
 Removed tsDefs.h</h3>
 
diff --git a/src/ioc/db/RULES b/src/ioc/db/RULES
index 951123ca4..694092b82 100644
--- a/src/ioc/db/RULES
+++ b/src/ioc/db/RULES
@@ -13,9 +13,12 @@
 
 # $(filter-out $(STATIC_SRCS),$(dbCore_SRCS)) : $(COMMON_DIR)/dbCommon.h
 
+dbCommon.h$(DEP): $(IOCDIR)/db/dbCommonRecord.dbd
+	@$(RM) $@
+	@$(DBTORECORDTYPEH) -D -I ../db -o $(COMMONDEP_TARGET) $< > $@
+	@echo "$(COMMONDEP_TARGET): ../Makefile" >> $@
+
 $(COMMON_DIR)/dbCommon.h: $(IOCDIR)/db/dbCommonRecord.dbd
-	@$(RM) $(notdir $@)$(DEP)
-	@$(DBTORECORDTYPEH) -D -I ../db -o $@ $< > $(notdir $@)$(DEP)
 	@$(RM) $(notdir $@)
 	$(DBTORECORDTYPEH) -I ../db -o $(notdir $@) $<
 	@$(MV) $(notdir $@) $@
diff --git a/src/libCom/as/RULES b/src/libCom/as/RULES
index c2f2d8a4f..5ed3edd97 100644
--- a/src/libCom/as/RULES
+++ b/src/libCom/as/RULES
@@ -12,8 +12,9 @@
 # This is a Makefile fragment, see src/libCom/Makefile.
 
 # Extra rule since asLib_lex.c is included by asLib.c
-asLib$(OBJ): asLib_lex.c
+asLib$(DEP): asLib_lex.c
 
 # Ensure that lexer and parser are built before they are needed
 asLib.c: $(call PATH_FILTER, $(TOOLS)/antelope$(HOSTEXE))
 asLib_lex.c: $(call PATH_FILTER, $(TOOLS)/e_flex$(HOSTEXE))
+asLib_lex.c: $(INSTALL_INCLUDE)/flex.skel.static
diff --git a/src/std/Makefile b/src/std/Makefile
index ad1330122..72dd2b2b0 100644
--- a/src/std/Makefile
+++ b/src/std/Makefile
@@ -12,8 +12,6 @@ include $(TOP)/configure/CONFIG
 
 STDDIR=$(TOP)/src/std
 
-USR_DBDFLAGS += -I ../rec -I ../dev -I ../softIoc
-
 LIBRARY_IOC += dbRecStd
 dbRecStd_LIBS = dbCore ca Com