diff --git a/configure.ac b/configure.ac
index 5e470d2..d14c226 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,5 +31,29 @@ AC_C_INLINE
 # Checks for library functions.
 AC_CHECK_FUNCS([clock_getTime memset socket])
 
+
+# Enable maximum warnings
+AX_CFLAGS_WARN_ALL
+
+dnl The AX_CHECK_COMPILER_FLAGS maco was renamed to AX_CHECK_COMPILE_FLAG
+dnl Checking for both versions
+m4_ifdef([AX_CHECK_COMPILE_FLAG],
+         [AC_DEFUN([APPEND_FLAG],
+                   [AX_CHECK_COMPILE_FLAG([$1], [CFLAGS="$1 $CFLAGS"])])])
+
+m4_ifdef([AX_CHECK_COMPILER_FLAGS],
+         [AC_DEFUN([APPEND_FLAG],
+                   [AX_CHECK_COMPILER_FLAGS([$1], [CFLAGS="$1 $CFLAGS"])])])
+
+dnl If we found the flag checking macro, check some flags
+m4_ifdef([APPEND_FLAG],
+         [APPEND_FLAG([-Wextra])
+          APPEND_FLAG([-Wconversion])
+          APPEND_FLAG([-Wpointer-arith])
+          APPEND_FLAG([-Wfloat-equal])
+          APPEND_FLAG([-Wshadow])
+          APPEND_FLAG([-Wwrite-strings])
+          APPEND_FLAG([-Wc++-compat])])
+
 AC_CONFIG_FILES([ Makefile ])
 AC_OUTPUT