diff -Nru aws-c-cal-0.4.5.orig/CMakeLists.txt aws-c-cal-0.4.5/CMakeLists.txt
--- aws-c-cal-0.4.5.orig/CMakeLists.txt	2020-11-21 06:21:48.000000000 +0100
+++ aws-c-cal-0.4.5/CMakeLists.txt	2020-11-26 12:52:06.019080125 +0100
@@ -108,6 +108,7 @@
 
 # Our ABI is not yet stable
 set_target_properties(${PROJECT_NAME} PROPERTIES VERSION 1.0.0)
+set_target_properties(${CMAKE_PROJECT_NAME} PROPERTIES SOVERSION 0unstable)
 
 target_include_directories(${PROJECT_NAME} PUBLIC
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>