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+# ===========================================================================

+#       https://www.gnu.org/software/autoconf-archive/ax_r_package.html

+# ===========================================================================

+#

+# SYNOPSIS

+#

+#   AX_R_PACKAGE(pkgname[, version, R])

+#

+# DESCRIPTION

+#

+#   Checks for an R package.

+#

+#   Optionally checks for the version when a second argument is given. A

+#   different R can be used by providing a third argument.

+#

+# LICENSE

+#

+#   Copyright (c) 2017 Ricardo Wurmus

+#

+#   Copying and distribution of this file, with or without modification, are

+#   permitted in any medium without royalty provided the copyright notice

+#   and this notice are preserved. This file is offered as-is, without any

+#   warranty.

+

+#serial 1

+

+AC_DEFUN([AX_R_PACKAGE], [

+    pushdef([PKG],$1)

+    pushdef([VERSION],$2)

+

+    if test -z $R;

+    then

+        if test -z "$3";

+        then

+            R="R"

+        else

+            R="$3"

+        fi

+    fi

+

+    AC_MSG_CHECKING([R package PKG VERSION])

+

+    TEST=$( $R --silent --vanilla -e 'if(is.na(packageDescription("PKG"))) stop("not found")' 2>/dev/null )

+    AS_IF([test $? -eq 0], [], [

+      AC_MSG_RESULT([no])

+      AC_MSG_ERROR([R package PKG not found.])

+    ])

+

+    if test -n "VERSION"

+    then

+      TEST=$( $R --silent --vanilla -e 'if(!(packageDescription("PKG")$Version >= "VERSION")) stop("not found")' 2>/dev/null )

+      AS_IF([test $? -eq 0], [], [

+        AC_MSG_RESULT([no])

+        AC_MSG_ERROR([You need at least version VERSION of the R package PKG.])

+      ])

+    fi

+

+    AC_MSG_RESULT(yes)

+    popdef([PKG])

+    popdef([VERSION])

+])