diff --git a/make/htdocs.mk b/make/htdocs.mk
index 9e7a55b8..4d45d509 100644
--- a/make/htdocs.mk
+++ b/make/htdocs.mk
@@ -5,9 +5,12 @@ LESS_CPY                    ?= lesscpy
 include $(JWBDIR)/make/defs.mk
 
 # -- HTML
+PRETTIER                    := $(shell $(WHICH) prettier 2>/dev/null)
 INSTALLATION_FILE_TYPES     += HTML
 BUILD_HTMLDIR                = $(TOPDIR)/htdocs
 LOCAL_HTML                  += $(filter-out $(DONT_INSTALL),$(wildcard *.html *.css *.php *.js) $(FONTS) $(IMAGES))
+DONT_LINT_HTML              += $(shell $(ECHO) $(wildcard *.html) | xargs --no-run-if-empty $(GREP) -l '<?php')
+LOCAL_HTML_LINT             ?= $(addprefix .,$(addsuffix .lint,$(filter-out $(DONT_LINT_HTML),$(wildcard *.html *.php *.css *.js))))
 ifeq ($(HTML_SUBDIR),)
   HTML_SUBDIR               := $(shell $(PWD) | $(SED) '/.*\/htdocs\(\/\|$$\)/!d; s%.*/htdocs\(/\|$$\)%%')
 endif
@@ -23,7 +26,7 @@ include $(JWBDIR)/make/js.mk
 include $(JWBDIR)/make/rules.mk
 include $(JWBDIR)/make/dev-utils.mk
 
-all: $(LESS_GENERATED_CSS)
+all: $(LESS_GENERATED_CSS) lint
 install: install_HTML
 clean: textclean localclean doneclean clean.lesscpy
 test:
@@ -34,3 +37,30 @@ test:
 
 clean.lesscpy:
 	$(RM) -f $(LESS_GENERATED_CSS) *.tmp
+
+lint: $(LOCAL_HTML_LINT)
+clean: lint.clean
+lint.clean:
+	rm -f .*.lint
+
+.%.html.lint: %.html
+ifneq ($(PRETTIER),)
+	$(PRETTIER) $< >/dev/null
+endif
+	touch $@
+
+.%.php.lint: %.php
+	php -l $<
+	touch $@
+
+.%.css.lint: %.css
+ifneq ($(PRETTIER),)
+	$(PRETTIER) $< >/dev/null
+endif
+	touch $@
+
+.%.js.lint: %.js
+ifneq ($(PRETTIER),)
+	$(PRETTIER) $< >/dev/null
+endif
+	touch $@