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dnl A function to check if the system's zlib library should be used. The
dnl builtin zlib dnl is used by default unless the user configured with
dnl --with-system-zlib.
AC_DEFUN([AM_ZLIB],
[
# Use the system's zlib library.
zlibdir=-L../zlib
zlibinc="-I\$(srcdir)/../zlib"
AC_ARG_WITH(system-zlib,
[AS_HELP_STRING([--with-system-zlib], [use installed libz])],
zlibdir=
zlibinc=
)
AC_SUBST(zlibdir)
AC_SUBST(zlibinc)
])
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