new file mode 100644
--- /dev/null
+++ b/runtime/syntax/m3build.vim
@@ -0,0 +1,177 @@
+" Vim syntax file
+" Language:	Modula-3 Makefile
+" Maintainer:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:	2021 April 15
+
+if exists("b:current_syntax")
+  finish
+endif
+
+runtime! syntax/m3quake.vim
+
+" Identifiers
+syn match m3buildPredefinedVariable "\<\%(TARGET\|OS_TYPE\|BUILD_DIR\|PKG_USE\|WDROOT\)\>"
+
+" Build Procedures {{{1
+" Generated from cm3/m3-sys/cm3/src/M3Build.m3
+syn keyword m3buildProcedure HasCBackend
+
+"    (* packages & locations *)
+syn keyword m3buildProcedure Pkg
+syn keyword m3buildProcedure override
+syn keyword m3buildProcedure path_of
+syn keyword m3buildProcedure pkg_subdir
+
+"    (* names *)
+syn keyword m3buildProcedure program_name
+syn keyword m3buildProcedure library_name
+
+"    (* calls in the generated .M3EXPORT files *)
+syn keyword m3buildProcedure _define_lib
+syn keyword m3buildProcedure _define_pgm
+syn keyword m3buildProcedure _import_template
+syn keyword m3buildProcedure _import_m3lib
+syn keyword m3buildProcedure _import_otherlib
+syn keyword m3buildProcedure _map_add_interface
+syn keyword m3buildProcedure _map_add_generic_interface
+syn keyword m3buildProcedure _map_add_module
+syn keyword m3buildProcedure _map_add_generic_module
+syn keyword m3buildProcedure _map_add_c
+syn keyword m3buildProcedure _map_add_h
+syn keyword m3buildProcedure _map_add_s
+
+"    (* compiler options *)
+syn keyword m3buildProcedure m3_debug
+syn keyword m3buildProcedure m3_optimize
+syn keyword m3buildProcedure build_shared
+syn keyword m3buildProcedure build_standalone
+
+"    (* derived files *)
+syn keyword m3buildProcedure m3_compile_only
+syn keyword m3buildProcedure m3_finish_up
+
+"    (* predefined system libraries *)
+syn keyword m3buildProcedure import_sys_lib
+
+"    (* options *)
+syn keyword m3buildProcedure m3_option
+syn keyword m3buildProcedure remove_m3_option
+
+"    (* deleting *)
+syn keyword m3buildProcedure deriveds
+
+"    (* imports *)
+syn keyword m3buildProcedure include_dir
+syn keyword m3buildProcedure include_pkg
+syn keyword m3buildProcedure import
+syn keyword m3buildProcedure import_version
+syn keyword m3buildProcedure import_obj
+syn keyword m3buildProcedure import_lib
+
+"    (* objects *)
+syn keyword m3buildProcedure pgm_object
+
+"    (* sources *)
+syn keyword m3buildProcedure source
+syn keyword m3buildProcedure pgm_source
+syn keyword m3buildProcedure interface
+syn keyword m3buildProcedure Interface
+syn keyword m3buildProcedure implementation
+syn keyword m3buildProcedure module
+syn keyword m3buildProcedure Module
+syn keyword m3buildProcedure h_source
+syn keyword m3buildProcedure c_source
+syn keyword m3buildProcedure s_source
+syn keyword m3buildProcedure ship_source
+
+"    (* generics *)
+syn keyword m3buildProcedure generic_interface
+syn keyword m3buildProcedure Generic_interface
+syn keyword m3buildProcedure generic_implementation
+syn keyword m3buildProcedure Generic_implementation
+syn keyword m3buildProcedure generic_module
+syn keyword m3buildProcedure Generic_module
+syn keyword m3buildProcedure build_generic_intf
+syn keyword m3buildProcedure build_generic_impl
+
+"    (* derived sources *)
+syn keyword m3buildProcedure derived_interface
+syn keyword m3buildProcedure derived_implementation
+syn keyword m3buildProcedure derived_c
+syn keyword m3buildProcedure derived_h
+
+"    (* hiding/exporting *)
+syn keyword m3buildProcedure hide_interface
+syn keyword m3buildProcedure hide_generic_interface
+syn keyword m3buildProcedure hide_generic_implementation
+syn keyword m3buildProcedure export_interface
+syn keyword m3buildProcedure export_generic_interface
+syn keyword m3buildProcedure export_generic_implementation
+
+"    (* templates *)
+syn keyword m3buildProcedure template
+
+"    (* library building *)
+syn keyword m3buildProcedure library
+syn keyword m3buildProcedure Library
+
+"    (* program building *)
+syn keyword m3buildProcedure program
+syn keyword m3buildProcedure Program
+syn keyword m3buildProcedure c_program
+syn keyword m3buildProcedure C_program
+
+"    (* man pages *)
+syn keyword m3buildProcedure manPage
+syn keyword m3buildProcedure ManPage
+
+"    (* emacs *)
+syn keyword m3buildProcedure Gnuemacs
+syn keyword m3buildProcedure CompiledGnuemacs
+
+"    (* "-find" support *)
+syn keyword m3buildProcedure find_unit
+syn keyword m3buildProcedure enum_units
+
+"    (* export functions *)
+syn keyword m3buildProcedure install_sources
+syn keyword m3buildProcedure install_derived
+syn keyword m3buildProcedure install_derived_link
+syn keyword m3buildProcedure install_derived_symbolic_link
+syn keyword m3buildProcedure install_derived_hard_link
+syn keyword m3buildProcedure install_link_to_derived
+syn keyword m3buildProcedure install_symbolic_link_to_derived
+syn keyword m3buildProcedure install_hard_link_to_derived
+syn keyword m3buildProcedure install_symbolic_link
+syn keyword m3buildProcedure install_file
+
+"    (* installation functions *)
+syn keyword m3buildProcedure BindExport
+syn keyword m3buildProcedure BinExport
+syn keyword m3buildProcedure LibdExport
+syn keyword m3buildProcedure LibExport
+syn keyword m3buildProcedure EmacsdExport
+syn keyword m3buildProcedure EmacsExport
+syn keyword m3buildProcedure DocdExport
+syn keyword m3buildProcedure DocExport
+syn keyword m3buildProcedure MandExport
+syn keyword m3buildProcedure ManExport
+syn keyword m3buildProcedure HtmlExport
+syn keyword m3buildProcedure RootExport
+syn keyword m3buildProcedure RootdExport
+
+"    (* misc *)
+syn keyword m3buildProcedure gen_m3exports
+syn keyword m3buildProcedure generate_tfile
+syn keyword m3buildProcedure delete_file
+syn keyword m3buildProcedure link_file
+syn keyword m3buildProcedure symbolic_link_file
+syn keyword m3buildProcedure hard_link_file
+" }}}
+
+hi def link m3buildPredefinedVariable Identifier
+hi def link m3buildProcedure	      Function
+
+let b:current_syntax = "m3build"
+
+" vim: nowrap sw=2 sts=2 ts=8 noet fdm=marker: