diff --git a/configure/CONFIG_COMMON b/configure/CONFIG_COMMON
index 6c0e11e0d..825725973 100644
--- a/configure/CONFIG_COMMON
+++ b/configure/CONFIG_COMMON
@@ -80,12 +80,12 @@ IOCS_APPL_TOP               = $(shell $(FULLPATHNAME) $(INSTALL_LOCATION))
 #-------------------------------------------------------
 # Silencing the build - suppress messages during 'make -s'
 NOP = :
-ECHO = @$(if $(findstring s,$(MFLAGS)),$(NOP),echo)
-QUIET_FLAG := $(if $(findstring s,$(MFLAGS)),-q,)
+ECHO = @$(if $(filter -s,$(MFLAGS)),$(NOP),echo)
+QUIET_FLAG := $(if $(filter -s,$(MFLAGS)),-q,)
 
 #-------------------------------------------------------
 # Convert 'make -q' flag into '-i' for genVersionHeader.pl
-QUESTION_FLAG := $(if $(findstring q,$(MFLAGS)),-i,)
+QUESTION_FLAG := $(if $(filter -q,$(MFLAGS)),-i,)
 
 #-------------------------------------------------------
 ifdef T_A
diff --git a/configure/RULES_EXPAND b/configure/RULES_EXPAND
index 2fce30de1..16c299c6d 100644
--- a/configure/RULES_EXPAND
+++ b/configure/RULES_EXPAND
@@ -86,8 +86,10 @@ expand_clean:
 ASSEMBLE_TOOL ?= $(PERL) $(TOOLS)/assembleSnippets.pl
 
 define COMMON_ASSEMBLY_template
+ifneq '$$($1_PATTERN)' ''
 $1_SNIPPETS += $$(foreach dir, .. $$(SRC_DIRS), \
     $$(wildcard $$(dir)/$$($1_PATTERN)))
+endif
 $(COMMON_DIR)/$1: $$($1_SNIPPETS)
 	$(ECHO) "Assembling common file $$@ from snippets"
 	@$(RM) $1
@@ -98,8 +100,10 @@ $(foreach asy, $(COMMON_ASSEMBLIES), \
     $(eval $(call COMMON_ASSEMBLY_template,$(strip $(asy)))))
 
 define ASSEMBLY_template
+ifneq '$$($1_PATTERN)' ''
 $1_SNIPPETS += $$(foreach dir, .. $$(SRC_DIRS), \
     $$(wildcard $$(dir)/$$($1_PATTERN)))
+endif
 $1: $$($1_SNIPPETS)
 	$(ECHO) "Assembling file $$@ from snippets"
 	@$(RM) $$@
diff --git a/configure/os/CONFIG.Common.RTEMS b/configure/os/CONFIG.Common.RTEMS
index 8425e6ef9..1319a7b50 100644
--- a/configure/os/CONFIG.Common.RTEMS
+++ b/configure/os/CONFIG.Common.RTEMS
@@ -76,7 +76,7 @@ CPPFLAGS += $($(BUILD_CLASS)_CPPFLAGS) $(POSIX_CPPFLAGS) $(OPT_CPPFLAGS)\
  $(USR_CPPFLAGS) $(CMD_CPPFLAGS) $(ARCH_DEP_CPPFLAGS) $(OP_SYS_CPPFLAGS)\
  $(OP_SYS_INCLUDE_CPPFLAGS) $(CODE_CPPFLAGS)
 
-ECHO = @$(if $(findstring s,$(MFLAGS)),$(NOP),echo)
+ECHO = @$(if $(filter -s,$(MFLAGS)),$(NOP),echo)
 
 #--------------------------------------------------
 # Although RTEMS uses gcc, it wants to use gcc its own way