https://github.com/google/snappy/issues/206
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -261,7 +261,6 @@ target_sources(snappy
     "snappy-stubs-internal.cc"
     "snappy.cc"
     "${PROJECT_BINARY_DIR}/config.h"
-  PUBLIC
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/snappy-c.h>
     $<INSTALL_INTERFACE:include/snappy-c.h>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/snappy-sinksource.h>