if(NOT MERGE_FILES)
add_library(mathed ${library_type} ${mathed_sources} ${mathed_headers})
-else(NOT MERGE_FILES)
+else()
lyx_const_touched_files(_allinone mathed_sources)
add_library(mathed ${library_type} ${_allinone_files})
-endif(NOT MERGE_FILES)
-
+endif()
project_source_group("${GROUP_CODE}" mathed_sources mathed_headers)