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build error

Created by dave. Last edited by dave, 19 years and 317 days ago. Viewed 2,486 times. #1
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Build Error with jpgtn 2.01

If you just try to build the source with any kind of recent linux compiler, you get an error:

gcc -Wall -O2 -L/home/jeremy/lib -I/home/jeremy/include   -c -o jpgtn.o jpgtn.c
jpgtn.c: In function `main':
jpgtn.c:79: warning: implicit declaration of function `getopt'
jpgtn.c:90: `optarg' undeclared (first use in this function)
jpgtn.c:90: (Each undeclared identifier is reported only once
jpgtn.c:90: for each function it appears in.)
jpgtn.c:137: `optind' undeclared (first use in this function)
make: *** [jpgtn.o] Error 1

The fix is to add an include file to jpgtn.c:

#include <unistd.h>
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