diff --git a/ports/Common.allports.mk b/ports/Common.allports.mk
index d3774ba..e233206 100644
--- a/ports/Common.allports.mk
+++ b/ports/Common.allports.mk
@@ -33,15 +33,18 @@
 #CC=clang
 CCDEP?=$(CC)
 
-CFLAGS+=-g -Wall -DLWIP_DEBUG -pedantic -Werror \
+CFLAGS+=-g -DLWIP_DEBUG -Wall -pedantic -Werror \
 	-Wparentheses -Wsequence-point -Wswitch-default \
 	-Wextra -Wundef -Wshadow -Wpointer-arith -Wcast-qual \
 	-Wc++-compat -Wwrite-strings -Wold-style-definition -Wcast-align \
 	-Wmissing-prototypes -Wredundant-decls -Wnested-externs \
-	-Wunreachable-code -Wuninitialized
+	-Wunreachable-code -Wuninitialized -Wmissing-prototypes \
+	-Wredundant-decls -Waggregate-return -Wlogical-not-parentheses \
+	-Wmissing-include-dirs
+#	-Wconversion -Wsign-compare
 
 ifeq (,$(findstring clang,$(CC)))
-CFLAGS+= -Wlogical-op
+CFLAGS+= -Wlogical-op -Wc90-c99-compat -Wtrampolines
 # if GCC is newer than 4.8/4.9 you may use:
 #CFLAGS:=$(CFLAGS) -fsanitize=address -fstack-protector -fstack-check -fsanitize=undefined -fno-sanitize=alignment
 else
@@ -49,11 +52,6 @@ else
 CFLAGS+= -fsanitize=address -fsanitize=undefined -fno-sanitize=alignment -Wdocumentation -Wno-documentation-deprecated-sync
 endif
 
-# not used for now but interesting:
-# -Wpacked
-# -ansi
-# -std=c89
-
 CONTRIBDIR?=../../..
 ARFLAGS?=rs