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/usr/share/highlight/langDefs/make.lang is in highlight-common 3.18-3.

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Description="Make"

Identifiers=[[ [a-zA-Z_][\w\d\-]* ]]

Keywords={
  { Id=1,
    List={"addprefix", "addsuffix", "basename", "dir", "filter", "filter-out", "findstring", "firstword", "foreach", "join", 
          "notdir", "origin", "patsubst", "shell", "sort", "strip", "subst", "suffix", "wildcard", "word", "words", "all_cflags", 
          "ar", "arflags", "as", "asflags", "cc", "cflags", "co", "coflags", "cpp", "cppflags", "ctangle", "cweave", "cxx",
          "cxxflags", "fc", "fflags", "force", "get", "gflags", "install_data", "install_program", "ld", "ldflags", "lex",
          "lflags", "makeinfo", "pc", "pflags", "rflags", "rm", "tags", "tangle", "tex", "texi2dvi", "weave", "yacc", "yaccr",
          "yflags", "all", "bindir", "check", "clean", "clobber", "datadir", "dist", "distclean", "dvi", "exec_prefix", 
          "includedir", "info", "infodir", "install", "installcheck", "installdirs", "libdir", "man0dir", "man0ext", "man1dir",
          "man1ext", "man2dir", "man2ext", "man3dir", "man3ext", "man4dir", "man4ext", "man5dir", "man5ext", "man6dir", "man6ext",
          "man7dir", "man7ext", "man8dir", "man8ext", "man9dir", "man9ext", "mandir", "manext", 
          "mostlyclean", "oldincludedir", "prefix", "print", "realclean", "shar", "srcdir", "statedir", "tar", "test", "uninstall"},
  },
  { Id=2,
    List={"define", "else", "endef", "endif", "export", "ifdef", "ifeq", "ifndef", "ifneq", "include", "override", "unexport"},
  },
  { Id=3,
    Regex=[[(\$\{(\w+)\})]],
  },
  { Id=4,
    Regex=[[\$\w+]],
  }
}

Strings={
  Delimiter=[["|'|`]],
}

IgnoreCase=false

Comments={
  { Block=false,
    Delimiter= { [[#]] },
  },
}

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\:|\&|<|>|\!|\=|\/|\*|\%|\+|\-|\$]]