diff --git a/.gitignore b/.gitignore
index dc55dac3..27903ee0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,7 +11,7 @@
 **/model_data
 outputs
 technology/freepdk45/ncsu_basekit
-technology/sky130/*_lib
+technology/sky130/*_lib/sky130_fd_*
 technology/sky130/tech/.magicrc
 technology/gf180mcu/*_lib
 .idea
diff --git a/Makefile b/Makefile
index bc20d699..036601e6 100644
--- a/Makefile
+++ b/Makefile
@@ -98,7 +98,7 @@ sky130-install: $(SRAM_LIB_DIR)
 	@echo "PDK_ROOT='$(PDK_ROOT)'"
 	@echo "SRAM_LIB_DIR='$(SRAM_LIB_DIR)'"
 	@echo "SKY130_PDK='$(SKY130_PDK)'"
-	@make $(INSTALL_DIRS)
+	@$(MAKE) -B $(INSTALL_DIRS)
 .PHONY: sky130-install
 
 sky130-pdk: $(SKY130_PDKS_DIR)