diff --git a/haiku/GNUosspecific.mk b/haiku/GNUosspecific.mk
index acd12f97..b9317f5e 100644
--- a/haiku/GNUosspecific.mk
+++ b/haiku/GNUosspecific.mk
@@ -3,3 +3,8 @@
 EXESUFFIX =
 LIBSUFFIX = .so
 OSHSUFFIX = .hpp
+
+gccver = $(shell $(CC) --version | sed 's/-.*//g')
+ifeq ($(gccver),2.95.3)
+$(error Sorry; GCC 4 is necessary to build libui for Haiku)
+endif