在RedLinux7.2上编译基于Motif的程序不知该如何配置环境？

我在测试基于Motif的小程序时，系统报头文件找不到。

程序如下test.c：
#include

 1<xm pushb.h="">   
 2main (int argc, char *argv[])   
 3{   
 4Widget toplevel, button;   
 5XtAppContext app;   
 6void button_pushed(Widget, XtPointer, XtPointer);   
 7XmString label;   
 8Arg args[2];   
 9XtSetLanguageProc (NULL, NULL, NULL);   
10toplevel = XtVaOpenApplication (&amp;app, "Hello", NULL, 0, &amp;argc, argv,   
11NULL,sessionShellWidgetClass, NULL);   
12label = XmStringCreateLocalized ("Push here to say hello");   
13XtSetArg(args[0], XmNlabelString, label);   
14button = XmCreatePushButton (toplevel, "pushme", args, 1);   
15XmStringFree (label);   
16XtAddCallback (button, XmNactivateCallback, button_pushed, NULL);   
17XtManageChild (button);   
18XtRealizeWidget (toplevel);   
19XtAppMainLoop (app);   
20}   
21void button_pushed (Widget widget, XtPointer client_data, XtPointer call_data)   
22{   
23printf ("Hello Yourself!\n");   
24}   
25  
26我的编译命令：   
27gcc -W -o test test.c -L/usr/X11R6/lib -lXm -lXt -lX11   
28  
29报错为：   
30Xm/PushB.h：No such file or directory   
31  
32Xm的目录是个链接，实际情况为:   
33/usr/X11R6/include/Xm -&gt; ../LessTif/Motif1.2/include/Xm   
34  
35\---------------------------------------------------------------   
36  
37gcc -W -o test test.c -L/usr/X11R6/lib -lXm -lXt -lX11 -I/usr/X11R6/include</xm>