+
+AM_CFLAGS = -std=gnu99 -Wmissing-prototypes -Wstrict-prototypes \
+ -Werror-implicit-function-declaration \
+ -fno-common -Wundef -Wno-pointer-sign
+
+if WINDOWS_NATIVE_BUILD
+# This option is needed to make packed structures work as expected
+# with gcc 4.7+ (mingw) on Windows.
+AM_CFLAGS += -mno-ms-bitfields
+endif