dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
+dnl Check that a new enough version of Perl is available.
+AC_DEFUN([PSPP_PERL],
+[
+ AC_PATH_PROG([PERL], perl, no)
+ AC_SUBST([PERL])dnl
+ if test "$PERL" = no; then
+ AC_MSG_ERROR([perl is not found])
+ fi
+ $PERL -e 'require 5.005_03;' || {
+ AC_MSG_ERROR([Perl 5.005_03 or better is required])
+ }
+])
+
+dnl Check that libplot is available.
+AC_DEFUN([PSPP_LIBPLOT],
+[
+ AC_ARG_WITH(libplot, [ --without-libplot don't compile in support of charts (using libplot)])
+
+ if test x"$with_libplot" != x"no" ; then
+ AC_CHECK_LIB(plot, pl_newpl_r,,
+ AC_MSG_ERROR([You must install libplot development libraries (or use --without-libplot)])
+ )
+ fi
+])
+
+dnl Check that off_t is defined as an integer type.
+dnl Solaris sometimes declares it as a struct, if it
+dnl thinks that the compiler does not support `long long'.
+AC_DEFUN([PSPP_OFF_T],
+[
+ AC_COMPILE_IFELSE([#include <sys/types.h>
+ #include <unistd.h>
+ off_t x = 0;
+ int main (void)
+ {
+ lseek (0, 1, 2);
+ return 0;
+ }], [], [AC_MSG_ERROR(
+ [Your system's definition of off_t is broken. You are probably
+ using Solaris. You can probably fix the problem with
+ `--disable-largefile' or `CFLAGS=-ansi'.])])
+])
+
+dnl Check whether a warning flag is accepted.
+dnl If so, add it to CFLAGS.
+dnl Example: PSPP_ENABLE_WARNING(-Wdeclaration-after-statement)
+AC_DEFUN([PSPP_ENABLE_WARNING],
+[
+ m4_define([pspp_cv_name], [pspp_cv_[]m4_translit([$1], [-], [_])])dnl
+ AC_CACHE_CHECK([whether $CC accepts $1], [pspp_cv_name],
+ [pspp_save_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $1"
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [pspp_cv_name[]=yes], [pspp_cv_name[]=no])
+ CFLAGS="$pspp_save_CFLAGS"])
+ if test $pspp_cv_name = yes; then
+ CFLAGS="$CFLAGS $1"
+ fi
+])
+
dnl Check for readline and history libraries.
dnl Modified for PSPP by Ben Pfaff, based on readline.m4 serial 3 from