put in tests to see if R is in system so that unit tests can run

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@9183 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Makefile.in

@@ -86,7 +86,7 @@ check-aliveness:
 	@$(skip-csharp)   || ./$(TARGET) -csharp   -help
 	@$(skip-modula3)  || ./$(TARGET) -modula3  -help
 	@$(skip-lua)      || ./$(TARGET) -lua      -help
-	@$(skip-r) 	  || ./$(TARGET) -lua      -help
+	@$(skip-r) 	  || ./$(TARGET) -r        -help
 
 # Checks examples for compilation (does not run them)
 check-examples:					\

configure.in

@@ -1723,6 +1723,28 @@ fi
 
 AC_SUBST(CLISPBIN)
 
+#----------------------------------------------------------------
+# Look for GNU R
+#----------------------------------------------------------------
+
+RBIN=
+
+AC_ARG_WITH(clisp, AS_HELP_STRING([--without-clisp], [Disable R])
+AS_HELP_STRING([--with-clisp=path], [Set location of R executable (clisp)]),[ RBIN="$withval"], [RBIN=yes])
+
+# First, check for "--without-clisp" or "--with-clisp=no".
+if test x"${RBIN}" = xno -o x"${with_alllang}" = xno ; then 
+AC_MSG_NOTICE([Disabling R])
+else
+
+# can we find R?
+if test "x$RBIN" = xyes; then
+   AC_PATH_PROG(RBIN, R)
+fi
+fi
+
+AC_SUBST(RBIN)
+
 #----------------------------------------------------------------
 # Determine which languages to use for examples/test-suite
 #----------------------------------------------------------------
@@ -1842,6 +1864,12 @@ if test -z "$CLISPBIN" ; then
 fi
 AC_SUBST(SKIP_CLISP)
 
+SKIP_R=
+if test -z "$RBIN" ; then
+    SKIP_R="1"
+fi
+AC_SUBST(SKIP_R)
+
 SKIP_CFFI=
 #if test -z "$CFFIBIN" ; then
     SKIP_CFFI="1"