Only process back-* subdirectories that have a Makefile.

servers/slapd/Makefile.in

@@ -160,7 +160,7 @@ sslapd: version.o
 
 .backend: $(@PLAT@_IMPLIB) FORCE
 	@for i in back-*; do \
-		if [ -d $$i ]; then \
+		if [ -d $$i -a -f $$i/Makefile ]; then \
 			echo " "; echo "  cd $$i; $(MAKE) $(MFLAGS) all"; \
 			( cd $$i; $(MAKE) $(MFLAGS) all ); \
 			if test $$? != 0 ; then exit 1; fi ; \
@@ -197,7 +197,7 @@ version.c: $(OBJS) $(SLAPD_LIBDEPEND)
 
 depend-local-srv: FORCE
 	@for i in back-* shell-backends tools; do \
-		if [ -d $$i ]; then \
+		if [ -d $$i -a -f $$i/Makefile ]; then \
 			echo; echo "  cd $$i; $(MAKE) $(MFLAGS) depend"; \
 			( cd $$i; $(MAKE) $(MFLAGS) depend ); \
 			if test $$? != 0 ; then exit 1; fi ; \
@@ -210,7 +210,7 @@ clean-local:
 
 clean-local-srv: FORCE
 	@for i in back-* shell-backends tools; do \
-		if [ -d $$i ]; then \
+		if [ -d $$i -a -f $$i/Makefile ]; then \
 			echo; echo "  cd $$i; $(MAKE) $(MFLAGS) clean"; \
 			( cd $$i; $(MAKE) $(MFLAGS) clean ); \
 			if test $$? != 0 ; then exit 1; fi ; \
@@ -220,7 +220,7 @@ clean-local-srv: FORCE
 
 veryclean-local-srv: FORCE
 	@for i in back-* shell-backends tools; do \
-		if [ -d $$i ]; then \
+		if [ -d $$i -a -f $$i/Makefile ]; then \
 			echo; echo "  cd $$i; $(MAKE) $(MFLAGS) clean"; \
 			( cd $$i; $(MAKE) $(MFLAGS) veryclean ); \
 		fi; \
@@ -235,7 +235,7 @@ install-slapd: FORCE
 		slapd$(EXEEXT) $(DESTDIR)$(libexecdir)
 	@if [ ! -z "$(SLAPD_MODULES)" ]; then \
 	    for i in back-* shell-backends tools; do \
-		if [ -d $$i ]; then \
+		if [ -d $$i -a -f $$i/Makefile ]; then \
 			echo; echo "  cd $$i; $(MAKE) $(MFLAGS) install"; \
 			( cd $$i; $(MAKE) $(MFLAGS) install ); \
 			if test $$? != 0 ; then exit 1; fi ; \