As per practice, they should be underscores.
build_libraries-level
build_sources_library console.c conversion.c directory.c private-directory.c environment.c private-environment.c file.c private-file.c fss.c iki.c memory.c path.c pipe.c print.c serialize.c private-serialize.c socket.c utf.c private-utf.c
build_sources_program
-build_sources_headers color.h console.h conversion.h directory.h directory_type.h environment.h file.h fss.h fss-common.h fss-named.h fss-nest.h fss-quoted.h fss-set.h iki.h iki-common.h memory.h memory-structure.h path.h pipe.h print.h serialize.h socket.h status.h status_array.h string.h string-common.h string-dynamic.h string-map.h string-quantity.h string-range.h type.h type_array.h utf.h utf-common.h
+build_sources_headers color.h console.h conversion.h directory.h directory_type.h environment.h file.h fss.h fss-common.h fss-named.h fss-nest.h fss-quoted.h fss-set.h iki.h iki-common.h memory.h memory-structure.h path.h pipe.h print.h serialize.h socket.h status.h status_array.h string.h string_common.h string_dynamic.h string_map.h string_quantity.h string_range.h type.h type_array.h utf.h utf-common.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-quoted.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_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-quoted.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
#include <level_0/type.h>
// fll-0 string includes
-#include <level_0/string-common.h>
-#include <level_0/string-dynamic.h>
-#include <level_0/string-map.h>
-#include <level_0/string-quantity.h>
-#include <level_0/string-range.h>
+#include <level_0/string_common.h>
+#include <level_0/string_dynamic.h>
+#include <level_0/string_map.h>
+#include <level_0/string_quantity.h>
+#include <level_0/string_range.h>
#ifdef __cplusplus
extern "C" {
build_libraries-individual -lf_memory
build_sources_library
build_sources_program
-build_sources_headers string.h string-common.h string-dynamic.h string-map.h string-quantity.h string-range.h
+build_sources_headers string.h string_common.h string_dynamic.h string_map.h string_quantity.h string_range.h
build_sources_script
build_sources_setting
build_script yes