tinc/m4/zlib.m4

dnl Check to find the zlib headers/libraries

AC_DEFUN(tinc_ZLIB,
[
  tinc_ac_save_CPPFLAGS="$CPPFLAGS"

  AC_ARG_WITH(zlib-include,
    [  --with-zlib-include=DIR zlib headers directory],
    [zlib_include="$withval"
     CFLAGS="$CFLAGS -I$withval"
     CPPFLAGS="$CPPFLAGS -I$withval"]
  )

  AC_ARG_WITH(zlib-lib,
    [  --with-zlib-lib=DIR     zlib library directory],
    [zlib_lib="$withval"
     LIBS="$LIBS -L$withval"]
  )

  AC_CHECK_HEADERS(zlib.h,
    [],
    [AC_MSG_ERROR("zlib header files not found."); break]
  )

  CPPFLAGS="$tinc_ac_save_CPPFLAGS"

  AC_CHECK_LIB(z, compress2,
    [LIBS="$LIBS -lz"],
    [AC_MSG_ERROR("zlib libraries not found.")]
  )
])