attempt to fix include paths

fggl/CMakeLists.txt

 
 # headers
-file(GLOB HEADER_LIST CONFIGURE_DEPENDS "${fggl_SOURCE_DIR}/include/fggl/*.hpp" )
+file(GLOB_RECURSE HEADER_LIST CONFIGURE_DEPENDS "${fggl_SOURCE_DIR}/include/fggl/*.hpp" )
 
 # the fggl library itself
 add_library(fggl ${HEADER_LIST})
@@ -8,8 +8,8 @@ add_library(fggl ${HEADER_LIST})
 # we need to tell people using the library about our headers
 target_include_directories( fggl
 	PUBLIC
-	  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include/fggl>
-	  $<INSTALL_INTERFACE:include/fggl>
+	  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+	  $<INSTALL_INTERFACE:include>
 )
 
 # users of this library need at least C++17