diff --git a/autogen.sh b/autogen.sh
index 07236426..a31f611c 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -6,7 +6,11 @@ CFLAGS="-O2"
 CFLAGS="$CFLAGS -Wall"
 CFLAGS="$CFLAGS -Wextra"
 CFLAGS="$CFLAGS -Werror=implicit-function-declaration"
+CFLAGS="$CFLAGS -Werror=implicit-int"
+CFLAGS="$CFLAGS -Werror=incompatible-pointer-types"
+CFLAGS="$CFLAGS -Werror=int-conversion"
 CFLAGS="$CFLAGS -Wno-expansion-to-defined"
+CFLAGS="$CFLAGS -Wno-unknown-warning-option"
 
 "$(dirname "$0")"/configure \
 	CFLAGS="$CFLAGS" \