diff --git a/comms/libbtbb/files/patch-lib_CMakeLists.txt b/comms/libbtbb/files/patch-lib_CMakeLists.txt
new file mode 100644
index 000000000000..cbf58292e4d6
--- /dev/null
+++ b/comms/libbtbb/files/patch-lib_CMakeLists.txt
@@ -0,0 +1,11 @@
+--- lib/CMakeLists.txt.orig	2019-07-19 07:29:49 UTC
++++ lib/CMakeLists.txt
+@@ -32,7 +32,7 @@ add_definitions( -DVERSION="${VERSION}" )
+ 
+ if(NOT MSVC)
+ 	add_definitions(-Wall)
+-	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu90")
++	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu89")
+ endif()
+ 
+ add_subdirectory(src)