Why do I need a C compiler?

[Reuben Thomas]

I am using the following set of gnulib modules:

Module list with included dependencies (indented):
  announce-gen
  do-release-commit-and-tag
    gendocs
  gitlog-to-changelog
    gnu-web-doc-update
    gnumakefile
  gnupload
  maintainer-makefile
  readme-release
  update-copyright
    useless-if-before-free
    vc-list-files

And I have the following configure.ac:

AC_PREREQ([2.61])
AC_INIT([Zee], [2.5.0.50], address@hidden)
AC_CONFIG_AUX_DIR([build-aux])
AM_INIT_AUTOMAKE([-Wall -Werror std-options])
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
gl_EARLY
gl_INIT
AX_PROG_LUA([502])
AX_WITH_PROG([HELP2MAN], [help2man], [false])
AC_CONFIG_FILES([Makefile src/zee.lua])
AC_OUTPUT

If I comment out the two gl_* lines, it doesn't test for a C compiler.
I can't see that any of the modules listed above require a C compiler
(though I'm not absolutely sure how to check that).

Also, the gnulib modules list above seems a bit wrong:
useless-if-before-free & vc-list-files are dependencies of
maintainer-makefile, not of update-copyright.

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