編譯libjpeg-9a時，竟找不到jconfig.h
1、用交叉編譯器編譯時，找不到jconfig.h標頭檔案：
In file included from libjpeg/jpeg-9a/jaricom.c:17:0:
libjpeg/jpeg-9a/jinclude.h:20:55: fatal error: jconfig.h: No such file or directory
compilation terminated.
make: *** [libjpeg/jpeg-9a/jaricom.o] 錯誤 1
2、檢視程式碼檔案，在jconfig.txt中，描述如下：
* The actual configuration options for a particular installation are stored
* in jconfig.h. On many machines, jconfig.h can be generated automatically
* or copied from one of the "canned" jconfig files that we supply. But if
* you need to generate a jconfig.h file by hand, this file tells you how.
*
* DO NOT EDIT THIS FILE --- IT WON'T ACCOMPLISH ANYTHING.
* EDIT A COPY NAMED JCONFIG.H.
*/
3、我用的是ubuntu系統，在視窗下複製一個副本，然後改名，再編譯，錯誤依舊。。。。
有點灰心，不知為什麼，然後新建text.h，可以正確包含； 將text.h改名jconfig.h，正常； 將jconfig.txt內容複製到jconfig.h中，編譯OK。
仔細回顧下，感覺是檔案許可權什麼的不對，ls -l :
4、仔細觀察，jconfig_.h（第一次複製的標頭檔案）前面竟然有一個空格。。。。。