Not having fss.h goes against some of the basic design.
Keep fss.h, but do not provide fss.c.
build_libraries-level -lfll_0
build_sources_library color.c console.c conversion.c directory.c private-directory.c private-fss.c fss_basic.c fss_basic_list.c fss_extended.c fss_extended_list.c iki.c print.c status.c string.c private-string.c utf.c private-utf.c utf_file.c private-utf_file.c
build_sources_program
-build_sources_headers color.h console.h conversion.h directory.h fss_basic.h fss_basic_list.h fss_extended.h fss_extended_list.h fss_macro.h fss_status.h iki.h print.h status.h string.h utf.h utf_file.h
+build_sources_headers color.h console.h conversion.h directory.h fss.h fss_basic.h fss_basic_list.h fss_extended.h fss_extended_list.h fss_macro.h fss_status.h iki.h print.h status.h string.h utf.h utf_file.h
build_sources_script
build_sources_setting
build_script yes
build_libraries-monolithic
build_sources_library level_0/console.c level_0/conversion.c level_0/directory.c level_0/private-directory.c level_0/environment.c level_0/private-environment.c level_0/file.c level_0/private-file.c level_0/fss.c level_0/iki.c level_0/memory.c level_0/path.c level_0/pipe.c level_0/print.c level_0/serialize.c level_0/private-serialize.c level_0/socket.c level_0/utf.c level_0/private-utf.c level_1/color.c level_1/console.c level_1/conversion.c level_1/directory.c level_1/private-directory.c level_1/private-fss.c level_1/fss_basic.c level_1/fss_basic_list.c level_1/fss_extended.c level_1/fss_extended_list.c level_1/iki.c level_1/print.c level_1/status.c level_1/string.c level_1/private-string.c level_1/utf.c level_1/private-utf.c level_1/utf_file.c level_1/private-utf_file.c level_2/execute.c level_2/private-execute.c level_2/file.c level_2/fss.c level_2/private-fss.c level_2/fss_basic.c level_2/fss_basic_list.c level_2/fss_extended.c level_2/fss_extended_list.c level_2/fss_status.c level_2/program.c level_2/status.c
build_sources_program
-build_sources_headers level_0/color.h level_0/console.h level_0/conversion.h level_0/directory.h level_0/directory_type.h level_0/environment.h level_0/file.h level_0/fss.h level_0/fss-common.h level_0/fss-named.h level_0/fss-nest.h level_0/fss-set.h level_0/iki.h level_0/iki-common.h level_0/memory.h level_0/memory-structure.h level_0/path.h level_0/pipe.h level_0/print.h level_0/serialize.h level_0/socket.h level_0/status.h level_0/status_array.h level_0/string.h level_0/string-common.h level_0/string-dynamic.h level_0/string-map.h level_0/string-quantity.h level_0/string-range.h level_0/type.h level_0/type_array.h level_0/utf.h level_0/utf-common.h level_1/color.h level_1/console.h level_1/conversion.h level_1/directory.h level_1/fss_basic.h level_1/fss_basic_list.h level_1/fss_extended.h level_1/fss_extended_list.h level_1/fss_macro.h level_1/fss_status.h level_1/iki.h level_1/print.h level_1/status.h level_1/string.h level_1/utf.h level_1/utf_file.h level_2/execute.h level_2/file.h level_2/fss.h level_2/fss_basic.h level_2/fss_basic_list.h level_2/fss_extended.h level_2/fss_extended_list.h level_2/fss_status.h level_2/program.h level_2/status.h
+build_sources_headers level_0/color.h level_0/console.h level_0/conversion.h level_0/directory.h level_0/directory_type.h level_0/environment.h level_0/file.h level_0/fss.h level_0/fss-common.h level_0/fss-named.h level_0/fss-nest.h level_0/fss-set.h level_0/iki.h level_0/iki-common.h level_0/memory.h level_0/memory-structure.h level_0/path.h level_0/pipe.h level_0/print.h level_0/serialize.h level_0/socket.h level_0/status.h level_0/status_array.h level_0/string.h level_0/string-common.h level_0/string-dynamic.h level_0/string-map.h level_0/string-quantity.h level_0/string-range.h level_0/type.h level_0/type_array.h level_0/utf.h level_0/utf-common.h level_1/color.h level_1/console.h level_1/conversion.h level_1/directory.h level_1/fss.h level_1/fss_basic.h level_1/fss_basic_list.h level_1/fss_extended.h level_1/fss_extended_list.h level_1/fss_macro.h level_1/fss_status.h level_1/iki.h level_1/print.h level_1/status.h level_1/string.h level_1/utf.h level_1/utf_file.h level_2/execute.h level_2/file.h level_2/fss.h level_2/fss_basic.h level_2/fss_basic_list.h level_2/fss_extended.h level_2/fss_extended_list.h level_2/fss_status.h level_2/program.h level_2/status.h
build_sources_script
build_sources_setting
build_script yes
--- /dev/null
+/**
+ * FLL - Level 1
+ *
+ * Project: FSS
+ * API Version: 0.5
+ * Licenses: lgplv2.1
+ */
+#ifndef _FL_fss_h
+#define _FL_fss_h
+
+// libc includes
+#include <ctype.h>
+#include <string.h>
+
+// fll-0 includes
+#include <level_0/type.h>
+#include <level_0/status.h>
+#include <level_0/memory.h>
+#include <level_0/string.h>
+#include <level_0/utf.h>
+#include <level_0/file.h>
+#include <level_0/fss.h>
+
+// fll-1 includes
+#include <level_1/fss_status.h>
+#include <level_1/fss_macro.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // _FL_fss_h
#include <level_0/utf.h>
// fll-1 includes
+#include <level_1/fss.h>
#include <level_1/fss_status.h>
#include <level_1/fss_macro.h>
#include <level_0/utf.h>
// fll-1 includes
+#include <level_1/fss.h>
#include <level_1/fss_basic.h>
#include <level_1/fss_status.h>
#include <level_1/fss_macro.h>
#include <level_0/utf.h>
// fll-1 includes
+#include <level_1/fss.h>
#include <level_1/fss_status.h>
#include <level_1/fss_macro.h>
#include <level_0/utf.h>
// fll-1 includes
+#include <level_1/fss.h>
#include <level_1/fss_basic.h>
#include <level_1/fss_status.h>
#include <level_1/fss_macro.h>
+#include <level_1/fss.h>
#include "private-fss.h"
#ifdef __cplusplus
#ifndef _PRIVATE_FL_fss_h
#define _PRIVATE_FL_fss_h
-// libc includes
-#include <ctype.h>
-#include <string.h>
-
-// fll-0 includes
-#include <level_0/status.h>
-#include <level_0/fss.h>
-#include <level_0/string.h>
-#include <level_0/type.h>
-#include <level_0/memory.h>
-#include <level_0/utf.h>
-
-// fll-1 includes
-#include <level_1/fss_status.h>
-#include <level_1/fss_macro.h>
-
#ifdef __cplusplus
extern "C" {
#endif
build_libraries-individual -lf_fss -lf_file -lf_utf -lf_memory
build_sources_library private-fss.c fss_basic.c fss_basic_list.c fss_extended.c fss_extended_list.c
build_sources_program
-build_sources_headers fss_basic.h fss_basic_list.h fss_extended.h fss_extended_list.h fss_macro.h fss_status.h
+build_sources_headers fss.h fss_basic.h fss_basic_list.h fss_extended.h fss_extended_list.h fss_macro.h fss_status.h
build_sources_script
build_sources_setting
build_script yes
#include <level_0/string.h>
#include <level_0/utf.h>
#include <level_0/fss.h>
-#include <level_0/file.h>
// fll-1 includes
#include <level_1/conversion.h>
+#include <level_1/fss.h>
#include <level_1/fss_macro.h>
#include <level_1/fss_status.h>
#include <level_1/string.h>
#include <level_0/utf.h>
// fll-1 includes
+#include <level_1/fss.h>
#include <level_1/fss_macro.h>
#include <level_1/fss_status.h>
#include <level_1/fss_basic.h>
#include <level_0/type.h>
// fll-1 includes
+#include <level_1/fss.h>
#include <level_1/fss_basic_list.h>
#include <level_1/fss_status.h>
#include <level_1/fss_macro.h>
#include <level_0/type.h>
// fll-1 includes
+#include <level_1/fss.h>
#include <level_1/fss_status.h>
#include <level_1/fss_extended.h>
#include <level_1/fss_macro.h>
#include <level_0/type.h>
// fll-1 includes
+#include <level_1/fss.h>
#include <level_1/fss_extended_list.h>
#include <level_1/fss_status.h>
#include <level_1/fss_macro.h>
#include <level_0/type.h>
// fll-1 includes
+#include <level_1/fss.h>
#include <level_1/fss_basic.h>
#include <level_1/fss_status.h>
#include <level_1/fss_macro.h>
// fll-1 includes
#include <level_1/color.h>
#include <level_1/console.h>
+#include <level_1/fss.h>
#include <level_1/fss_basic_list.h>
#include <level_1/fss_extended.h>
#include <level_1/string.h>