tinc/m4/lzo.m4

dnl Check to find the lzo headers/libraries

AC_DEFUN([tinc_LZO],
[
  AC_ARG_ENABLE([lzo],
    AS_HELP_STRING([--disable-lzo], [disable lzo compression support]))
  AS_IF([test "x$enable_lzo" != "xno"], [
    AC_DEFINE(HAVE_LZO, 1, [enable lzo compression support])
    AC_ARG_WITH(lzo,
      AS_HELP_STRING([--with-lzo=DIR], [lzo base directory, or:]),
      [lzo="$withval"
       CPPFLAGS="$CPPFLAGS -I$withval/include"
       LDFLAGS="$LDFLAGS -L$withval/lib"]
    )

    AC_ARG_WITH(lzo-include,
      AS_HELP_STRING([--with-lzo-include=DIR], [lzo headers directory]),
      [lzo_include="$withval"
       CPPFLAGS="$CPPFLAGS -I$withval"]
    )

    AC_ARG_WITH(lzo-lib,
      AS_HELP_STRING([--with-lzo-lib=DIR], [lzo library directory]),
      [lzo_lib="$withval"
       LDFLAGS="$LDFLAGS -L$withval"]
    )

    AC_CHECK_LIB(lzo2, lzo1x_1_compress,
      [LIBS="$LIBS -llzo2"],
      [AC_CHECK_LIB(lzo, lzo1x_1_compress,
        [LIBS="$LIBS -llzo"],
        [AC_MSG_ERROR("lzo libraries not found."); break]
      )]
    )

    AC_CHECK_HEADERS(lzo/lzo1x.h,
      [AC_DEFINE(LZO1X_H, [<lzo/lzo1x.h>], [Location of lzo1x.h])],
      [AC_CHECK_HEADERS(lzo2/lzo1x.h,
        [AC_DEFINE(LZO1X_H, [<lzo2/lzo1x.h>], [Location of lzo1x.h])],
        [AC_CHECK_HEADERS(lzo1x.h,
          [AC_DEFINE(LZO1X_H, [<lzo1x.h>], [Location of lzo1x.h])],
          [AC_MSG_ERROR("lzo header files not found."); break]
        )]
      )]
    )
  ])
])