diff --git a/GNUmakefile b/GNUmakefile
index 207bcdd7..0d5532ca 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -62,6 +62,10 @@ LDFLAGS += \
 	-lnetwork \
 	-Wno-stringop-overflow
 USE_SYSTEM_SSL := 1
+HAVE_ANDROID = 0
+HAVE_LINUX_IOS = 0
+HAVE_LINUX_MACOS = 0
+HAVE_WIN = 0
 else ifeq ($(UNAME_S),OpenBSD)
 BUILD_TYPES := debug release
 CFLAGS += \