dnl Do we have a usable compiler and 'install'?
AC_PROG_CC
AC_PROG_INSTALL
+AC_LANG_WERROR
dnl Checking for GNUTLS and libgcrypt.
PKG_CHECK_MODULES(GNUTLS, gnutls >= 1.4.0, , AC_MSG_ERROR(Could not find gnutls))
dnl Setting useful flags.
LIBS="$LIBGCRYPT_LIBS $GNUTLS_LIBS $LIBS -lz"
-CFLAGS="$LIBGCRYPT_CFLAGS $GNUTLS_CFLAGS $CFLAGS"
+CFLAGS="$LIBGCRYPT_CFLAGS $GNUTLS_CFLAGS \
+ -Wall -Werror -Wextra -Wunused -Wunused-variable \
+ $CFLAGS"
dnl Outputting the necessary files for the build.
AC_CONFIG_HEADERS([config.h])