Merge pull request #98 from willyd/relocatable

Added $<BUILD_INTERFACE> to gflags include directory

diff --cc CMakeLists.txt
index f5078d6,d8a13bc..dc446b9
--- 1/CMakeLists.txt
--- 2/CMakeLists.txt
+++ b/CMakeLists.txt
@@@ -395,8 -385,12 +395,8 @@@ if (WIN32 AND HAVE_SNPRINTF
      HAVE_SNPRINTF)
  endif (WIN32 AND HAVE_SNPRINTF)
  
 -if (HAVE_NO_UNNAMED_TYPE_TEMPLATE_ARGS)
 -  target_compile_options (glog PUBLIC -Wno-unnamed-type-template-args)
 -endif (HAVE_NO_UNNAMED_TYPE_TEMPLATE_ARGS)
 -
  if (gflags_FOUND)
-   target_include_directories (glog PUBLIC ${gflags_INCLUDE_DIR})
+   target_include_directories (glog PUBLIC $<BUILD_INTERFACE:${gflags_INCLUDE_DIR}>)
    target_link_libraries (glog PUBLIC ${gflags_LIBRARIES})
  
    if (NOT BUILD_SHARED_LIBS)