I think it's good now

Makefile

@@ -47,7 +47,7 @@ $(DST_DIR)/%.html: $(SRC_DIR)/%.org $(TEMPLATE)
 HTML_INDEX := $(DST_DIR)/index.html
 MKINDEX := engine/mk-index.sh
 
-$(HTML_INDEX): $(SRC_PANDOC_FILES) $(MKINDEX)
+$(HTML_INDEX): $(DST_PANDOC_FILES) $(MKINDEX)
 	mkdir -p $(DST_DIR)
 	$(MKINDEX)
 
@@ -72,7 +72,7 @@ $(DST_DIR)/%.gmi: $(SRC_DIR)/%.org $(GMI)
 
 OPTIM_DIR ?= _optim
 OPTIM := engine/pre-deploy.sh
-$(OPTIM_DIR)/index.html: $(HTML_INDEX) $(SRC_RAW_FILES) $(OPTIM)
+$(OPTIM_DIR)/index.html:$(DST_RAW_FILES) $(DST_GMI_FILES) $(DST_PANDOC_FILES) $(HTML_INDEX) $(OPTIM)
 	mkdir -p $(OPTIM_DIR)
 	$(OPTIM)
 
@@ -87,5 +87,8 @@ deploy: $(OPTIM_DIR)/index.html
 
 allatend: $(ALL)
 
+.PHONY: clean
+
 clean:
-	rm -rf $(DST_DIR)/*
+	-rm -rf $(DST_DIR)/*
+	-rm -rf $(OPTIM_DIR)/*

engine/optim-classes.sh

@@ -4,12 +4,12 @@ cd "$(git rev-parse --show-toplevel)" || exit 1
 webdir="_optim"
 
 retrieve_classes_in_html () {
-    cat $webdir/**/*.html(N) | \
+    cat $webdir/**/*.html | \
         perl -pe 's/class="?([a-zA-Z0-9_-]*)/\nCLASS: $1\n/g'
 }
 
 retrieve_classes_in_css () {
-    cat $webdir/**/*.css(N) | \
+    cat $webdir/**/*.css | \
         perl -pe 's/ \.([a-zA-Z-_][a-zA-Z0-9-_]*)/\nCLASS:$1\n/g'
 }