--- a/src/libtscore/Makefile
+++ b/src/libtscore/Makefile
@@ -102,7 +102,6 @@
 PRECONFIG = $(SYSROOT)$(SYSPREFIX)/include/tscore/tsPreConfiguration.h
 
 install-devel: $(if $(NOSTATIC),,$(STATIC_LIBTSCORE)) $(TSCORE_H)
-	rm -rf $(SYSROOT)$(SYSPREFIX)/include/tscore
 	install -d -m 755 $(SYSROOT)$(USRLIBDIR) $(SYSROOT)$(SYSPREFIX)/include/tscore
 	$(if $(NOSTATIC),,install -m 644 $(STATIC_LIBTSCORE) $(SYSROOT)$(USRLIBDIR))
 	install -m 644 $(addsuffix /*.h,$(LIBTSCORE_INCLUDES)) $(TSCORE_H) $(SYSROOT)$(SYSPREFIX)/include/tscore