--- a/configure	Sat Mar 16 18:43:11 2019 +0100
+++ b/configure	Sat Mar 16 18:51:02 2019 +0100
@@ -24,7 +24,7 @@
 PRNGLIBS=
 
 CFLAGS="-fPIC -std=c99"
-CFLAGS="$CFLAGS -Wall -pedantic"
+CFLAGS="$CFLAGS -Wall -pedantic -Wextra -Wshadow -Wformat=2"
 LDFLAGS="-shared"
 
 IDN_LIBRARY="idn"