newlib-cygwin/config/zlib.m4

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dnl A function to check for zlib availability. zlib is used by default
dnl unless the user configured with --disable-nls.
AC_DEFUN([AM_ZLIB],
[
# See if the user specified whether he wants zlib support or not.
AC_ARG_WITH(zlib,
[ --with-zlib include zlib support (auto/yes/no) [default=auto]],
[], [with_zlib=auto])
if test "$with_zlib" != "no"; then
AC_SEARCH_LIBS(zlibVersion, z, [AC_CHECK_HEADERS(zlib.h)])
if test "$with_zlib" = "yes" -a "$ac_cv_header_zlib_h" != "yes"; then
AC_MSG_ERROR([zlib (libz) library was explicitly requested but not found])
fi
fi
])